update

backend/src/app/availability_service.py

@@ -4,6 +4,7 @@ from uuid import UUID
 from sqlalchemy import select
 from sqlalchemy.ext.asyncio import AsyncSession
 
+from app.config import settings
 from app.models import BusyBlock, Participant
 
 
@@ -70,13 +71,16 @@ async def calculate_availability(
     participants = {p.id: p for p in participants_result.scalars().all()}
 
     days = ["Mon", "Tue", "Wed", "Thu", "Fri"]
-    hours = list(range(0, 24))
+    slot_interval = settings.slot_interval_minutes
+    slots_per_hour = 60 // slot_interval
     slots = []
 
     for day_offset, day_name in enumerate(days):
-        for hour in hours:
-            slot_start = week_start + timedelta(days=day_offset, hours=hour)
-            slot_end = slot_start + timedelta(hours=1)
+        for hour in range(24):
+            for slot_idx in range(slots_per_hour):
+                minute = slot_idx * slot_interval
+                slot_start = week_start + timedelta(days=day_offset, hours=hour, minutes=minute)
+                slot_end = slot_start + timedelta(minutes=slot_interval)
 
                 available_participants = []
                 for pid in participant_ids:
@@ -98,6 +102,7 @@ async def calculate_availability(
                 slots.append({
                     "day": slot_start.strftime("%Y-%m-%d"),
                     "hour": hour,
+                    "minute": minute,
                     "start_time": slot_start,
                     "availability": availability,
                     "availableParticipants": available_participants,

backend/src/app/config.py

@@ -5,6 +5,7 @@ class Settings(BaseSettings):
     database_url: str = "postgresql+asyncpg://postgres:postgres@db:5432/availability"
     sync_database_url: str = "postgresql://postgres:postgres@db:5432/availability"
     ics_refresh_interval_minutes: int = 15
+    slot_interval_minutes: int = 15  # Time slot granularity (15, 30, or 60)
 
     # SMTP Settings
     smtp_host: str | None = None

backend/src/app/zulip_service.py

@@ -61,7 +61,8 @@ def send_zulip_notification(
             f"📅 **Meeting Scheduled**\n"
             f"**What:** {title}\n"
             f"**When:** {zulip_time}\n"
-            f"**Who:** {people}"
+            f"**Who:** {people}\n"
+            f"*Booked via [Meetly](https://meetly.app.monadical.io/)*"
         )
 
         request = {

frontend/src/components/AvailabilityHeatmap.tsx

@@ -12,7 +12,14 @@ import { Check, X, Loader2, ChevronLeft, ChevronRight, ChevronsRight } from 'luc
 const DEFAULT_TIMEZONE = 'America/Toronto';
 
 const dayNames = ['Mon', 'Tue', 'Wed', 'Thu', 'Fri'];
-const hours = Array.from({ length: 24 }, (_, i) => i); // 0-23
+const SLOT_INTERVAL_MINUTES = 15;
+const SLOTS_PER_HOUR = 60 / SLOT_INTERVAL_MINUTES;
+
+// Generate time slots: [{hour: 0, minute: 0}, {hour: 0, minute: 30}, {hour: 1, minute: 0}, ...]
+const timeSlots = Array.from({ length: 24 * SLOTS_PER_HOUR }, (_, i) => ({
+  hour: Math.floor(i / SLOTS_PER_HOUR),
+  minute: (i % SLOTS_PER_HOUR) * SLOT_INTERVAL_MINUTES,
+}));
 
 // Get the dates for Mon-Fri of a week in a specific timezone, offset by N weeks
 const getWeekDates = (timezone: string, weekOffset: number = 0): string[] => {
@@ -46,11 +53,11 @@ const getWeekDates = (timezone: string, weekOffset: number = 0): string[] => {
   });
 };
 
-// Convert a date string and hour in a timezone to a UTC Date
-const toUTCDate = (dateStr: string, hour: number, timezone: string): Date => {
-  // Create a date string that represents the given hour in the given timezone
+// Convert a date string, hour, and minute in a timezone to a UTC Date
+const toUTCDate = (dateStr: string, hour: number, minute: number, timezone: string): Date => {
+  // Create a date string that represents the given time in the given timezone
   // Then parse it to get the UTC equivalent
-  const localDateStr = `${dateStr}T${String(hour).padStart(2, '0')}:00:00`;
+  const localDateStr = `${dateStr}T${String(hour).padStart(2, '0')}:${String(minute).padStart(2, '0')}:00`;
 
   // Use a trick: format in UTC then in target TZ to find the offset
   const testDate = new Date(localDateStr + 'Z'); // Treat as UTC first
@@ -111,29 +118,32 @@ const getTimezoneAbbrev = (timezone: string): string => {
   }
 };
 
-// Convert an hour from one timezone to another
-const convertHourBetweenTimezones = (
+// Convert a time from one timezone to another
+const convertTimeBetweenTimezones = (
   hour: number,
+  minute: number,
   dateStr: string,
   fromTimezone: string,
   toTimezone: string
-): number => {
+): { hour: number; minute: number } => {
   try {
-    // Create a UTC date for the given hour in the source timezone
-    const utcDate = toUTCDate(dateStr, hour, fromTimezone);
+    // Create a UTC date for the given time in the source timezone
+    const utcDate = toUTCDate(dateStr, hour, minute, fromTimezone);
 
-    // Format the hour in the target timezone
-    const targetHour = parseInt(
-      new Intl.DateTimeFormat('en-US', {
+    // Format the time in the target timezone
+    const formatter = new Intl.DateTimeFormat('en-US', {
       timeZone: toTimezone,
       hour: 'numeric',
+      minute: 'numeric',
       hour12: false,
-      }).format(utcDate)
-    );
+    });
+    const parts = formatter.formatToParts(utcDate);
+    const targetHour = parseInt(parts.find(p => p.type === 'hour')?.value || '0');
+    const targetMinute = parseInt(parts.find(p => p.type === 'minute')?.value || '0');
 
-    return targetHour;
+    return { hour: targetHour, minute: targetMinute };
   } catch {
-    return hour;
+    return { hour, minute };
   }
 };
 
@@ -216,24 +226,24 @@ export const AvailabilityHeatmap = ({
     const timer = setTimeout(() => {
       if (!scrollContainerRef.current) return;
 
-      const rowHeight = 52; // h-12 (48px) + gap (4px)
-      const rowsAbove = 2;
+      const rowHeight = 28; // h-6 (24px) + gap (4px)
+      const rowsAbove = 4; // Show a few slots before current time
 
-      // Calculate which hour should be at the top
+      // Calculate which slot should be at the top (multiply by slots per hour)
       const targetHour = todayIndex >= 0
-        ? Math.max(0, currentHour - rowsAbove)
+        ? Math.max(0, currentHour - Math.floor(rowsAbove / SLOTS_PER_HOUR))
         : 7; // Default to 7am for other weeks
 
-      scrollContainerRef.current.scrollTop = targetHour * rowHeight;
+      scrollContainerRef.current.scrollTop = targetHour * SLOTS_PER_HOUR * rowHeight;
     }, 100);
 
     return () => clearTimeout(timer);
   }, [weekOffset, todayIndex, currentHour, selectedParticipants.length, isLoading, slots.length]);
 
-  // Find a slot that matches the given display timezone date/hour
-  const getSlot = (dateStr: string, hour: number): TimeSlot | undefined => {
-    // Convert display timezone date/hour to UTC
-    const targetUTC = toUTCDate(dateStr, hour, displayTimezone);
+  // Find a slot that matches the given display timezone date/hour/minute
+  const getSlot = (dateStr: string, hour: number, minute: number): TimeSlot | undefined => {
+    // Convert display timezone date/hour/minute to UTC
+    const targetUTC = toUTCDate(dateStr, hour, minute, displayTimezone);
 
     return slots.find((s) => {
       const slotDate = new Date(s.start_time);
@@ -249,13 +259,13 @@ export const AvailabilityHeatmap = ({
     return slot.availability;
   };
 
-  const formatHour = (hour: number) => {
-    return `${hour.toString().padStart(2, '0')}:00`;
+  const formatTime = (hour: number, minute: number) => {
+    return `${hour.toString().padStart(2, '0')}:${minute.toString().padStart(2, '0')}`;
   };
 
-  const isSlotTooSoon = (dateStr: string, hour: number) => {
+  const isSlotTooSoon = (dateStr: string, hour: number, minute: number) => {
     // Convert to UTC and compare with current time
-    const slotTimeUTC = toUTCDate(dateStr, hour, displayTimezone);
+    const slotTimeUTC = toUTCDate(dateStr, hour, minute, displayTimezone);
     const now = new Date();
     const twoHoursFromNow = new Date(now.getTime() + 2 * 60 * 60 * 1000);
     return slotTimeUTC < twoHoursFromNow;
@@ -271,11 +281,11 @@ export const AvailabilityHeatmap = ({
     return `${format(monday)} – ${format(friday)}`;
   };
 
-  // Format hour for display in popover (in the display timezone)
-  const formatDisplayTime = (hour: number) => {
-    // Create a date at that hour
+  // Format time for display in popover (in the display timezone)
+  const formatDisplayTime = (hour: number, minute: number) => {
+    // Create a date at that time
     const date = new Date();
-    date.setHours(hour, 0, 0, 0);
+    date.setHours(hour, minute, 0, 0);
     return new Intl.DateTimeFormat('en-US', {
       hour: 'numeric',
       minute: '2-digit',
@@ -430,10 +440,10 @@ export const AvailabilityHeatmap = ({
             </div>
 
             <div className="space-y-1">
-            {hours.map((hour) => (
+              {timeSlots.map(({ hour, minute }) => (
                 <div
-                key={hour}
-                ref={todayIndex >= 0 && hour === currentHour ? currentHourRef : undefined}
+                  key={`${hour}-${minute}`}
+                  ref={todayIndex >= 0 && hour === currentHour && minute === 0 ? currentHourRef : undefined}
                   className={cn(
                     "grid gap-1",
                     showSecondaryTimezone
@@ -444,37 +454,45 @@ export const AvailabilityHeatmap = ({
                   {showSecondaryTimezone ? (
                     <>
                       <div className="text-xs text-primary font-medium flex items-center justify-center gap-1">
-                      {todayIndex >= 0 && hour === currentHour && (
+                        {todayIndex >= 0 && hour === currentHour && minute === 0 && (
                           <span className="w-2 h-2 rounded-full bg-primary animate-pulse" />
                         )}
-                      {formatHour(hour)}
+                        {formatTime(hour, minute)}
                       </div>
                       <div className="text-xs text-muted-foreground flex items-center justify-center">
-                      {formatHour(convertHourBetweenTimezones(hour, weekDates[0] || '', displayTimezone, secondaryTimezone))}
+                        {(() => {
+                          const converted = convertTimeBetweenTimezones(hour, minute, weekDates[0] || '', displayTimezone, secondaryTimezone);
+                          return formatTime(converted.hour, converted.minute);
+                        })()}
                       </div>
                     </>
                   ) : (
                     <div className="text-xs text-muted-foreground flex items-center justify-end pr-3 gap-1">
-                    {todayIndex >= 0 && hour === currentHour && (
+                      {todayIndex >= 0 && hour === currentHour && minute === 0 && (
                         <span className="w-2 h-2 rounded-full bg-primary animate-pulse" />
                       )}
-                    {formatHour(hour)}
+                      {formatTime(hour, minute)}
                     </div>
                   )}
                   {weekDates.map((dateStr, dayIndex) => {
-                  const slot = getSlot(dateStr, hour);
+                    const slot = getSlot(dateStr, hour, minute);
                     const dayName = dayNames[dayIndex];
-                  const tooSoon = isSlotTooSoon(dateStr, hour);
-                  if (!slot) return <div key={`${dateStr}-${hour}`} className="h-12 bg-muted rounded" />;
+                    const tooSoon = isSlotTooSoon(dateStr, hour, minute);
+                    if (!slot) return <div key={`${dateStr}-${hour}-${minute}`} className="h-6 bg-muted rounded" />;
 
                     const effectiveAvailability = getEffectiveAvailability(slot);
 
+                    // Calculate end time for display
+                    const endMinute = minute + SLOT_INTERVAL_MINUTES;
+                    const endHour = hour + Math.floor(endMinute / 60);
+                    const endMinuteNormalized = endMinute % 60;
+
                     return (
-                    <Popover key={`${dateStr}-${hour}`}>
+                      <Popover key={`${dateStr}-${hour}-${minute}`}>
                         <PopoverTrigger asChild>
                           <button
                             className={cn(
-                            "h-12 rounded-md transition-all duration-200 focus:outline-none focus:ring-2 focus:ring-ring focus:ring-offset-2",
+                              "h-6 rounded-md transition-all duration-200 focus:outline-none focus:ring-2 focus:ring-ring focus:ring-offset-2",
                               tooSoon && "opacity-40 cursor-not-allowed",
                               !tooSoon && "hover:scale-105 hover:shadow-md",
                               effectiveAvailability === 'full' && "bg-availability-full hover:bg-availability-full/90",
@@ -486,7 +504,7 @@ export const AvailabilityHeatmap = ({
                         <PopoverContent className="w-64 p-4 animate-scale-in" align="center">
                           <div className="space-y-3">
                             <div className="font-semibold text-foreground">
-                            {dayName} {formatDisplayTime(hour)}–{formatDisplayTime(hour + 1)}
+                              {dayName} {formatDisplayTime(hour, minute)}–{formatDisplayTime(endHour, endMinuteNormalized)}
                             </div>
                             {tooSoon && (
                               <div className="text-sm text-muted-foreground italic">

frontend/src/components/AvailabilityHeatmapV2.tsx

@@ -12,10 +12,19 @@ import { Tooltip, TooltipContent, TooltipProvider, TooltipTrigger } from '@/comp
 
 const DEFAULT_TIMEZONE = 'America/Toronto';
 const dayNames = ['Mon', 'Tue', 'Wed', 'Thu', 'Fri'];
+const SLOT_INTERVAL_MINUTES = 15;
+const SLOTS_PER_HOUR = 60 / SLOT_INTERVAL_MINUTES;
 const WORKING_HOUR_START = 8; // 8 AM
 const WORKING_HOUR_END = 18; // 6 PM
-const ALL_HOURS = Array.from({ length: 24 }, (_, i) => i);
-const WORKING_HOURS = Array.from({ length: WORKING_HOUR_END - WORKING_HOUR_START + 1 }, (_, i) => i + WORKING_HOUR_START);
+
+// Generate time slots with hour and minute
+const ALL_TIME_SLOTS = Array.from({ length: 24 * SLOTS_PER_HOUR }, (_, i) => ({
+  hour: Math.floor(i / SLOTS_PER_HOUR),
+  minute: (i % SLOTS_PER_HOUR) * SLOT_INTERVAL_MINUTES,
+}));
+const WORKING_TIME_SLOTS = ALL_TIME_SLOTS.filter(
+  slot => slot.hour >= WORKING_HOUR_START && slot.hour < WORKING_HOUR_END
+);
 
 // Helper to check if a slot is in the past or too close (2h buffer)
 const isSlotTooSoon = (slotDate: number) => {
@@ -88,21 +97,15 @@ export const AvailabilityHeatmapV2 = ({
   secondaryTimezone = DEFAULT_TIMEZONE,
 }: AvailabilityHeatmapV2Props) => {
   const [showFullDay, setShowFullDay] = useState(false);
-  const activeHours = showFullDay ? ALL_HOURS : WORKING_HOURS;
+  const activeSlots = showFullDay ? ALL_TIME_SLOTS : WORKING_TIME_SLOTS;
 
   const weekDates = useMemo(() => getWeekDates(displayTimezone, weekOffset), [displayTimezone, weekOffset]);
 
   // Pre-compute slots lookup map for O(1) access
-  // Key: YYYY-MM-DD:Hour
+  // Key: YYYY-MM-DD:Hour:Minute
   const slotsMap = useMemo(() => {
     const map = new Map<string, TimeSlot>();
     slots.forEach(slot => {
-      // Assuming slot.start_time is ISO string. 
-      // We need to match it to our grid's local time logic.
-      // This part is "flaky" in the original. 
-      // The slot comes with a specific absolute time.
-      // We want to place it in the intersection of "Day (in DisplayTZ)" and "Hour (in DisplayTZ)".
-
       const d = new Date(slot.start_time);
       // Format to DisplayTZ to find coordinate
       const formatter = new Intl.DateTimeFormat('en-CA', {
@@ -111,22 +114,22 @@ export const AvailabilityHeatmapV2 = ({
         month: '2-digit',
         day: '2-digit',
         hour: 'numeric',
+        minute: 'numeric',
         hour12: false
       });
-      // "2023-10-25, 14"
       const parts = formatter.formatToParts(d);
       const year = parts.find(p => p.type === 'year')?.value;
       const month = parts.find(p => p.type === 'month')?.value;
       const day = parts.find(p => p.type === 'day')?.value;
       const hour = parts.find(p => p.type === 'hour')?.value;
+      const minute = parts.find(p => p.type === 'minute')?.value;
 
-      if (year && month && day && hour) {
-        // Hour in 24h format might be "24" in some locales? No `hour12: false` gives 0-23 usually.
-        // But Intl sometimes returns "24"? No, 0-23.
+      if (year && month && day && hour && minute) {
         let h = parseInt(hour, 10);
+        let m = parseInt(minute, 10);
         if (h === 24) h = 0; // Just in case
 
-        const key = `${year}-${month}-${day}:${h}`;
+        const key = `${year}-${month}-${day}:${h}:${m}`;
         map.set(key, slot);
       }
     });
@@ -144,18 +147,43 @@ export const AvailabilityHeatmapV2 = ({
     return date.toLocaleDateString('en-US', { weekday: 'short', month: 'short', day: 'numeric' });
   };
 
-  const getSlotForCell = (date: Date, hour: number) => {
-    const key = `${formatDateKey(date)}:${hour}`;
+  const getSlotForCell = (date: Date, hour: number, minute: number) => {
+    const key = `${formatDateKey(date)}:${hour}:${minute}`;
     return slotsMap.get(key);
   };
 
-  const formatHour = (hour: number) => {
+  const formatTime = (hour: number, minute: number) => {
+    return new Date(0, 0, 0, hour, minute).toLocaleTimeString('en-US', {
+      hour: 'numeric',
+      minute: '2-digit',
+      hour12: true,
+    });
+  };
+
+  const formatHourOnly = (hour: number) => {
     return new Date(0, 0, 0, hour).toLocaleTimeString('en-US', {
       hour: 'numeric',
       hour12: true,
     });
   };
 
+  // Move hooks to top level to avoid conditional hook execution error
+  const tzOffsetDiff = useMemo(() => {
+    try {
+      const now = new Date();
+      const p = parseInt(new Intl.DateTimeFormat('en-US', { timeZone: displayTimezone, hour: 'numeric', hour12: false }).format(now));
+      const s = parseInt(new Intl.DateTimeFormat('en-US', { timeZone: secondaryTimezone, hour: 'numeric', hour12: false }).format(now));
+      let diff = s - p;
+      if (diff > 12) diff -= 24;
+      if (diff < -12) diff += 24;
+      return diff;
+    } catch {
+      return 0;
+    }
+  }, [displayTimezone, secondaryTimezone]);
+
+  const timeColWidth = showSecondaryTimezone ? "120px" : "80px";
+
   if (selectedParticipants.length === 0) {
     return (
       <div className="flex flex-col items-center justify-center p-12 border-2 border-dashed border-border/50 rounded-xl bg-muted/20 animate-fade-in">
@@ -245,9 +273,15 @@ export const AvailabilityHeatmapV2 = ({
         <div className="overflow-auto max-h-[600px] w-full relative">
           <div className="min-w-[700px]">
             {/* Grid Header */}
-            <div className="grid grid-cols-[80px_repeat(5,1fr)] sticky top-0 z-30 bg-card border-b border-border shadow-sm">
-              <div className="sticky left-0 z-40 bg-card text-xs font-semibold text-muted-foreground self-center p-3 text-right border-r border-border/50">
-                TIME
+            <div
+              className="grid sticky top-0 z-30 bg-card border-b border-border shadow-sm"
+              style={{ gridTemplateColumns: `${timeColWidth} repeat(5, 1fr)` }}
+            >
+              <div className="sticky left-0 z-40 bg-card text-xs font-semibold text-muted-foreground self-center p-3 text-right border-r border-border/50 flex flex-col items-end gap-1">
+                <span>{formatTimezoneDisplay(displayTimezone)}</span>
+                {showSecondaryTimezone && (
+                  <span className="text-[10px] text-muted-foreground/60 font-normal">{formatTimezoneDisplay(secondaryTimezone)}</span>
+                )}
               </div>
               {weekDates.map(date => {
                 const isToday = new Date().toDateString() === date.toDateString();
@@ -267,34 +301,62 @@ export const AvailabilityHeatmapV2 = ({
 
             {/* Grid Body */}
             <div className="relative">
-              {activeHours.map((hour) => {
+              {activeSlots.map(({ hour, minute }) => {
                 const isNight = hour < 8 || hour >= 18;
+
+                // Calculate secondary time
+                let secondaryHour = hour + tzOffsetDiff;
+                if (secondaryHour >= 24) secondaryHour -= 24;
+                if (secondaryHour < 0) secondaryHour += 24;
+
+                // Calculate end time for display
+                const endMinute = minute + SLOT_INTERVAL_MINUTES;
+                const endHour = hour + Math.floor(endMinute / 60);
+                const endMinuteNormalized = endMinute % 60;
+
                 return (
                   <div
-                    key={hour}
+                    key={`${hour}-${minute}`}
                     className={cn(
-                      "grid grid-cols-[80px_repeat(5,1fr)] group items-stretch transition-colors border-b border-border/30 last:border-0",
+                      "grid group items-stretch transition-colors border-border/30 last:border-0",
                       isNight ? "bg-muted/30" : "bg-card",
+                      minute === 0 ? "border-t border-border" : "border-t border-border/10",
                       "hover:bg-muted/10"
                     )}
+                    style={{ gridTemplateColumns: `${timeColWidth} repeat(5, 1fr)` }}
                   >
                     {/* Time Label - Sticky Left */}
                     <div className={cn(
-                      "text-xs text-muted-foreground font-medium text-right pr-4 py-3 flex items-center justify-end gap-1.5",
+                      "text-xs text-muted-foreground font-medium text-right pr-4 py-2 flex flex-col items-end justify-center gap-0.5",
                       "sticky left-0 z-20 border-r border-border/50",
                       isNight ? "bg-muted/30 backdrop-blur-md" : "bg-card"
                     )}>
+                      <div className="flex items-center gap-1.5">
+                        {minute === 0 ? (
+                          <div className="flex items-center gap-1.5 font-bold text-foreground/80">
                             {isNight ? (
                               <Moon className="w-3 h-3 text-slate-400/50" />
                             ) : (
                               <Sun className="w-3 h-3 text-amber-500/50" />
                             )}
-                      {formatHour(hour)}
+                            <span>{formatTime(hour, minute)}</span>
+                          </div>
+                        ) : (
+                          <span className="text-[10px] opacity-0 group-hover:opacity-50 transition-opacity">
+                            :{minute.toString().padStart(2, '0')}
+                          </span>
+                        )}
+                      </div>
+                      {showSecondaryTimezone && (
+                        <span className="text-[10px] text-muted-foreground/60 font-mono">
+                          {formatTime(secondaryHour, minute)}
+                        </span>
+                      )}
                     </div>
 
                     {/* Days */}
                     {weekDates.map(date => {
-                      const slot = getSlotForCell(date, hour);
+                      const slot = getSlotForCell(date, hour, minute);
                       const tooSoon = slot ? isSlotTooSoon(new Date(slot.start_time).getTime()) : true;
 
                       // Availability logic
@@ -306,28 +368,34 @@ export const AvailabilityHeatmapV2 = ({
 
                       // Styling
                       let bgClass = ""; // Default transparent
-                      if (!slot) bgClass = "bg-muted/10 pattern-diagonal-lines opacity-50";
-                      else if (isFull) bgClass = "bg-emerald-500/90 hover:bg-emerald-600 shadow-sm";
-                      else if (isPartial) bgClass = "bg-amber-400/80 hover:bg-amber-500 shadow-sm";
-                      else if (isNone || isPartialHidden) bgClass = "bg-transparent hover:bg-muted/20";
 
-                      if (tooSoon && slot) bgClass = cn(bgClass, "opacity-30 cursor-not-allowed pattern-diagonal-lines");
+                      if (!slot) {
+                        bgClass = "bg-muted/10 pattern-diagonal-lines opacity-50";
+                      } else if (tooSoon) {
+                        bgClass = "bg-muted/20 pattern-diagonal-lines cursor-not-allowed border border-border/10";
+                      } else if (isFull) {
+                        bgClass = "bg-emerald-500/90 hover:bg-emerald-600 shadow-sm";
+                      } else if (isPartial) {
+                        bgClass = "bg-amber-400/80 hover:bg-amber-500 shadow-sm";
+                      } else if (isNone || isPartialHidden) {
+                        bgClass = "bg-muted/50 hover:bg-muted/70 border border-border/20";
+                      }
 
                       return (
-                        <div key={date.toISOString()} className="p-1 h-[52px] border-r border-border/30 last:border-0">
+                        <div key={`${date.toISOString()}-${minute}`} className="p-0.5 h-[32px] border-r border-border/30 last:border-0">
                           {slot ? (
                             <Popover>
                               <PopoverTrigger asChild disabled={tooSoon}>
                                 <div className={cn(
                                   "w-full h-full rounded-md transition-all duration-200 cursor-pointer flex items-center justify-center group/cell relative overflow-hidden",
                                   bgClass,
-                                  !tooSoon && (isFull || isPartial) ? "scale-[0.98] hover:scale-100 hover:ring-2 ring-primary/20" : ""
+                                  !tooSoon ? "scale-[0.98] hover:scale-105 hover:z-10 hover:shadow-lg hover:ring-2 ring-primary/20" : ""
                                 )}>
                                   {/* Mini Indicators for color-blind accessibility or density */}
-                                  {isFull && <Check className="w-4 h-4 text-white opacity-0 group-hover/cell:opacity-100 transition-opacity" />}
+                                  {isFull && <Check className="w-3 h-3 text-white opacity-0 group-hover/cell:opacity-100 transition-opacity" />}
                                 </div>
                               </PopoverTrigger>
-                              <PopoverContent className="w-72 p-0 rounded-xl overflow-hidden shadow-xl border-border" side="right" align="start">
+                              <PopoverContent className="w-72 p-0 rounded-xl overflow-hidden shadow-xl border-border" side="right" align={hour >= 12 ? "end" : "start"}>
                                 <div className="p-4 bg-muted/30 border-b border-border/50">
                                   <h4 className="font-semibold text-base flex items-center gap-2">
                                     <CalendarIcon className="w-4 h-4 text-muted-foreground" />
@@ -335,7 +403,7 @@ export const AvailabilityHeatmapV2 = ({
                                   </h4>
                                   <div className="text-sm text-muted-foreground mt-1 flex items-center gap-2">
                                     <Clock className="w-4 h-4" />
-                                    {formatHour(hour)} - {formatHour(hour + 1)}
+                                    {formatTime(hour, minute)} - {formatTime(endHour, endMinuteNormalized)}
                                   </div>
                                 </div>
 
@@ -402,11 +470,11 @@ export const AvailabilityHeatmapV2 = ({
             </div>
           )}
           <div className="flex items-center gap-2">
-            <div className="w-3 h-3 rounded border border-slate-300 bg-slate-100 dark:bg-slate-800 dark:border-slate-700"></div>
+            <div className="w-3 h-3 rounded bg-muted/50 border border-border/20"></div>
             <span className="text-muted-foreground">Busy / No Match</span>
           </div>
           <div className="flex items-center gap-2">
-            <div className="w-3 h-3 rounded bg-muted/30 pattern-diagonal-lines ring-1 ring-border/50"></div>
+            <div className="w-3 h-3 rounded bg-muted/20 pattern-diagonal-lines border border-border/10"></div>
             <span className="text-muted-foreground">Past / Too Soon</span>
           </div>
         </div>

frontend/src/components/ParticipantSelector.tsx

@@ -94,11 +94,46 @@ export const ParticipantSelector = ({
 
   return (
     <div ref={containerRef} className="space-y-4">
-      <div className="relative">
-        <Search className="absolute left-3 top-1/2 -translate-y-1/2 w-4 h-4 text-muted-foreground" />
+      <div
+        className={cn(
+          "relative min-h-[48px] bg-background border border-border rounded-lg shadow-sm flex flex-wrap items-center gap-2 px-3 py-1.5 transition-all",
+          "focus-within:ring-2 focus-within:ring-primary/20 focus-within:border-primary"
+        )}
+        onClick={() => inputRef.current?.focus()}
+      >
+        <Search className="w-4 h-4 text-muted-foreground shrink-0 mr-1" />
+
+        {selectedParticipants.map((participant) => (
+          <div
+            key={participant.id}
+            className={cn(
+              "flex items-center gap-1.5 bg-accent text-accent-foreground pl-2 pr-1 py-1 rounded-full text-xs font-medium animate-scale-in",
+              "border border-primary/10 group hover:border-destructive/30 hover:bg-destructive/10 hover:text-destructive transition-colors cursor-default"
+            )}
+            onClick={(e) => e.stopPropagation()}
+          >
+            <div
+              className="w-4 h-4 rounded-full flex items-center justify-center text-[9px] font-bold text-white shrink-0"
+              style={{ backgroundColor: getAvatarColor(participant.name) }}
+            >
+              {getInitials(participant.name)}
+            </div>
+            <span className="max-w-[100px] truncate">{participant.name.split(' ')[0]}</span>
+            {!participant.icsLink && (
+              <AlertCircle className="w-3 h-3 text-amber-600 shrink-0" title="No calendar linked" />
+            )}
+            <button
+              onClick={() => removeParticipant(participant.id)}
+              className="w-4 h-4 rounded-full hover:bg-black/10 dark:hover:bg-white/10 flex items-center justify-center transition-colors shrink-0"
+            >
+              <X className="w-2.5 h-2.5" />
+            </button>
+          </div>
+        ))}
+
         <Input
           ref={inputRef}
-          placeholder="Search people..."
+          placeholder={selectedParticipants.length === 0 ? "Search people..." : "Add more..."}
           value={searchQuery}
           onChange={(e) => {
             setSearchQuery(e.target.value);
@@ -107,11 +142,25 @@ export const ParticipantSelector = ({
           }}
           onFocus={() => setIsDropdownOpen(true)}
           onKeyDown={handleKeyDown}
-          className="pl-10 h-12 bg-background border-border"
+          className="flex-1 min-w-[100px] h-7 border-none shadow-none focus-visible:ring-0 p-0 text-sm bg-transparent placeholder:text-muted-foreground/70"
         />
 
+        {isDropdownOpen && (
+          <button
+            onClick={(e) => {
+              e.stopPropagation();
+              setIsDropdownOpen(false);
+              inputRef.current?.blur();
+            }}
+            className="p-1 hover:bg-muted rounded-full transition-colors ml-1"
+            title="Close"
+          >
+            <X className="w-4 h-4 text-muted-foreground" />
+          </button>
+        )}
+
         {isDropdownOpen && filteredParticipants.length > 0 && (
-          <div className="absolute z-50 w-full mt-2 bg-popover border border-border rounded-lg shadow-popover animate-scale-in overflow-hidden">
+          <div className="absolute top-full left-0 z-50 w-full mt-2 bg-popover border border-border rounded-lg shadow-popover animate-scale-in overflow-hidden">
             {filteredParticipants.map((participant, index) => (
               <button
                 key={participant.id}
@@ -159,45 +208,6 @@ export const ParticipantSelector = ({
           </div>
         )}
       </div>
-
-      {selectedParticipants.length > 0 && (
-        <div className="flex flex-wrap gap-2">
-          {selectedParticipants.map((participant, index) => (
-            <div
-              key={participant.id}
-              className={cn(
-                "flex items-center gap-2 bg-accent text-accent-foreground px-3 py-2 rounded-full text-sm animate-scale-in",
-                "border border-primary/20"
-              )}
-              style={{ animationDelay: `${index * 50}ms` }}
-            >
-              <div
-                className="w-6 h-6 rounded-full flex items-center justify-center text-xs font-medium text-white"
-                style={{ backgroundColor: getAvatarColor(participant.name) }}
-              >
-                {getInitials(participant.name)}
-              </div>
-              <span className="font-medium">{participant.name.split(' ')[0]}</span>
-              {!participant.icsLink && (
-                <AlertCircle className="w-3 h-3 text-amber-600" title="No calendar linked" />
-              )}
-              <button
-                onClick={() => removeParticipant(participant.id)}
-                className="w-5 h-5 rounded-full hover:bg-primary/20 flex items-center justify-center transition-colors"
-              >
-                <X className="w-3 h-3" />
-              </button>
-            </div>
-          ))}
-          <button
-            onClick={() => setIsDropdownOpen(true)}
-            className="flex items-center gap-1 px-3 py-2 rounded-full text-sm border-2 border-dashed border-border text-muted-foreground hover:border-primary hover:text-primary transition-colors"
-          >
-            <Plus className="w-4 h-4" />
-            <span>Add</span>
-          </button>
-        </div>
-      )}
     </div>
   );
 };

frontend/src/components/TimezoneSelector.tsx

@@ -11,11 +11,12 @@ interface TimezoneSelectorProps {
 
 // Get all IANA timezones
 const getAllTimezones = (): string[] => {
+  let timezones: string[] = [];
   try {
-    return Intl.supportedValuesOf('timeZone');
+    timezones = Intl.supportedValuesOf('timeZone');
   } catch {
     // Fallback for older browsers
-    return [
+    timezones = [
       'UTC',
       'America/New_York',
       'America/Chicago',
@@ -23,6 +24,7 @@ const getAllTimezones = (): string[] => {
       'America/Los_Angeles',
       'America/Toronto',
       'America/Vancouver',
+      'America/Montreal',
       'Europe/London',
       'Europe/Paris',
       'Europe/Berlin',
@@ -33,6 +35,17 @@ const getAllTimezones = (): string[] => {
       'Pacific/Auckland',
     ];
   }
+
+  // Prioritize Montreal as requested
+  const priorityTimezone = 'America/Montreal';
+  if (!timezones.includes(priorityTimezone)) {
+    timezones.push(priorityTimezone);
+  }
+
+  return [
+    priorityTimezone,
+    ...timezones.filter((tz) => tz !== priorityTimezone),
+  ];
 };
 
 // Get UTC offset for a timezone
@@ -158,7 +171,7 @@ export const TimezoneSelector = ({
                 No timezones found
               </div>
             ) : (
-              filteredTimezones.slice(0, 50).map((timezone) => {
+              filteredTimezones.map((timezone) => {
                 const isSelected = timezone === value;
                 const offset = getTimezoneOffset(timezone);
                 const label = formatTimezoneLabel(timezone);
@@ -204,12 +217,6 @@ export const TimezoneSelector = ({
               })
             )}
           </div>
-
-          {filteredTimezones.length > 50 && (
-            <div className="px-4 py-2 text-xs text-muted-foreground text-center border-t border-border">
-              Showing 50 of {filteredTimezones.length} results
-            </div>
-          )}
         </div>
       )}
     </div>

frontend/src/components/ui/sheet.tsx

@@ -1,17 +1,17 @@
-import * as SheetPrimitive from "@radix-ui/react-dialog";
-import { cva, type VariantProps } from "class-variance-authority";
-import { X } from "lucide-react";
-import * as React from "react";
+import * as React from "react"
+import * as SheetPrimitive from "@radix-ui/react-dialog"
+import { cva, type VariantProps } from "class-variance-authority"
+import { X } from "lucide-react"
 
-import { cn } from "@/lib/utils";
+import { cn } from "@/lib/utils"
 
-const Sheet = SheetPrimitive.Root;
+const Sheet = SheetPrimitive.Root
 
-const SheetTrigger = SheetPrimitive.Trigger;
+const SheetTrigger = SheetPrimitive.Trigger
 
-const SheetClose = SheetPrimitive.Close;
+const SheetClose = SheetPrimitive.Close
 
-const SheetPortal = SheetPrimitive.Portal;
+const SheetPortal = SheetPrimitive.Portal
 
 const SheetOverlay = React.forwardRef<
   React.ElementRef<typeof SheetPrimitive.Overlay>,
@@ -20,13 +20,13 @@ const SheetOverlay = React.forwardRef<
   <SheetPrimitive.Overlay
     className={cn(
       "fixed inset-0 z-50 bg-black/80  data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0",
-      className,
+      className
     )}
     {...props}
     ref={ref}
   />
-));
-SheetOverlay.displayName = SheetPrimitive.Overlay.displayName;
+))
+SheetOverlay.displayName = SheetPrimitive.Overlay.displayName
 
 const sheetVariants = cva(
   "fixed z-50 gap-4 bg-background p-6 shadow-lg transition ease-in-out data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:duration-300 data-[state=open]:duration-500",
@@ -44,64 +44,95 @@ const sheetVariants = cva(
     defaultVariants: {
       side: "right",
     },
-  },
-);
+  }
+)
 
 interface SheetContentProps
   extends React.ComponentPropsWithoutRef<typeof SheetPrimitive.Content>,
   VariantProps<typeof sheetVariants> { }
 
-const SheetContent = React.forwardRef<React.ElementRef<typeof SheetPrimitive.Content>, SheetContentProps>(
-  ({ side = "right", className, children, ...props }, ref) => (
+const SheetContent = React.forwardRef<
+  React.ElementRef<typeof SheetPrimitive.Content>,
+  SheetContentProps
+>(({ side = "right", className, children, ...props }, ref) => (
   <SheetPortal>
     <SheetOverlay />
-      <SheetPrimitive.Content ref={ref} className={cn(sheetVariants({ side }), className)} {...props}>
+    <SheetPrimitive.Content
+      ref={ref}
+      className={cn(sheetVariants({ side }), className)}
+      {...props}
+    >
       {children}
-        <SheetPrimitive.Close className="absolute right-4 top-4 rounded-sm opacity-70 ring-offset-background transition-opacity data-[state=open]:bg-secondary hover:opacity-100 focus:outline-none focus:ring-2 focus:ring-ring focus:ring-offset-2 disabled:pointer-events-none">
+      <SheetPrimitive.Close className="absolute right-4 top-4 rounded-sm opacity-70 ring-offset-background transition-opacity hover:opacity-100 focus:outline-none focus:ring-2 focus:ring-ring focus:ring-offset-2 disabled:pointer-events-none data-[state=open]:bg-secondary">
         <X className="h-4 w-4" />
         <span className="sr-only">Close</span>
       </SheetPrimitive.Close>
     </SheetPrimitive.Content>
   </SheetPortal>
-  ),
-);
-SheetContent.displayName = SheetPrimitive.Content.displayName;
+))
+SheetContent.displayName = SheetPrimitive.Content.displayName
 
-const SheetHeader = ({ className, ...props }: React.HTMLAttributes<HTMLDivElement>) => (
-  <div className={cn("flex flex-col space-y-2 text-center sm:text-left", className)} {...props} />
-);
-SheetHeader.displayName = "SheetHeader";
+const SheetHeader = ({
+  className,
+  ...props
+}: React.HTMLAttributes<HTMLDivElement>) => (
+  <div
+    className={cn(
+      "flex flex-col space-y-2 text-center sm:text-left",
+      className
+    )}
+    {...props}
+  />
+)
+SheetHeader.displayName = "SheetHeader"
 
-const SheetFooter = ({ className, ...props }: React.HTMLAttributes<HTMLDivElement>) => (
-  <div className={cn("flex flex-col-reverse sm:flex-row sm:justify-end sm:space-x-2", className)} {...props} />
-);
-SheetFooter.displayName = "SheetFooter";
+const SheetFooter = ({
+  className,
+  ...props
+}: React.HTMLAttributes<HTMLDivElement>) => (
+  <div
+    className={cn(
+      "flex flex-col-reverse sm:flex-row sm:justify-end sm:space-x-2",
+      className
+    )}
+    {...props}
+  />
+)
+SheetFooter.displayName = "SheetFooter"
 
 const SheetTitle = React.forwardRef<
   React.ElementRef<typeof SheetPrimitive.Title>,
   React.ComponentPropsWithoutRef<typeof SheetPrimitive.Title>
 >(({ className, ...props }, ref) => (
-  <SheetPrimitive.Title ref={ref} className={cn("text-lg font-semibold text-foreground", className)} {...props} />
-));
-SheetTitle.displayName = SheetPrimitive.Title.displayName;
+  <SheetPrimitive.Title
+    ref={ref}
+    className={cn("text-lg font-semibold text-foreground", className)}
+    {...props}
+  />
+))
+SheetTitle.displayName = SheetPrimitive.Title.displayName
 
 const SheetDescription = React.forwardRef<
   React.ElementRef<typeof SheetPrimitive.Description>,
   React.ComponentPropsWithoutRef<typeof SheetPrimitive.Description>
 >(({ className, ...props }, ref) => (
-  <SheetPrimitive.Description ref={ref} className={cn("text-sm text-muted-foreground", className)} {...props} />
-));
-SheetDescription.displayName = SheetPrimitive.Description.displayName;
+  <SheetPrimitive.Description
+    ref={ref}
+    className={cn("text-sm text-muted-foreground", className)}
+    {...props}
+  />
+))
+SheetDescription.displayName = SheetPrimitive.Description.displayName
 
 export {
   Sheet,
+  SheetPortal,
+  SheetOverlay,
+  SheetTrigger,
   SheetClose,
   SheetContent,
-  SheetDescription,
-  SheetFooter,
   SheetHeader,
-  SheetOverlay,
-  SheetPortal,
+  SheetFooter,
   SheetTitle,
-  SheetTrigger,
-};
+  SheetDescription,
+}

frontend/src/index.css

@@ -233,3 +233,15 @@
   0%, 100% { opacity: 1; }
   50% { opacity: 0.7; }
 }
+
+.pattern-diagonal-lines {
+  background-image: repeating-linear-gradient(
+    45deg,
+    currentColor,
+    currentColor 1px,
+    transparent 1px,
+    transparent 10px
+  );
+  background-size: 10px 10px;
+  opacity: 0.1;
+}

frontend/src/pages/Index.tsx

@@ -16,6 +16,11 @@ import {
   PopoverContent,
   PopoverTrigger,
 } from '@/components/ui/popover';
+import {
+  Sheet,
+  SheetContent,
+  SheetTrigger,
+} from '@/components/ui/sheet';
 import {
   AlertDialog,
   AlertDialogAction,
@@ -62,8 +67,8 @@ interface SettingsState {
 const defaultSettings: SettingsState = {
   showPartialAvailability: false,
   displayTimezone: getUserTimezone(),
-  showSecondaryTimezone: false,
-  secondaryTimezone: 'America/Toronto', // Company timezone as default secondary
+  showSecondaryTimezone: true,
+  secondaryTimezone: 'America/Montreal', // Company timezone as default secondary
 };
 
 function apiToParticipant(p: ParticipantAPI): Participant {
@@ -90,7 +95,7 @@ const Index = ({ defaultTab = 'schedule' }: IndexProps) => {
   const [availabilitySlots, setAvailabilitySlots] = useState<TimeSlot[]>([]);
   const [selectedSlot, setSelectedSlot] = useState<TimeSlot | null>(null);
   const [isModalOpen, setIsModalOpen] = useState(false);
-  const [useRedesign, setUseRedesign] = useState(false);
+  const [useRedesign, setUseRedesign] = useState(true);
   const [settings, setSettings] = useState<SettingsState>(defaultSettings);
   const [weekOffset, setWeekOffset] = useState(0);
   const [isLoading, setIsLoading] = useState(false);
@@ -316,16 +321,22 @@ const Index = ({ defaultTab = 'schedule' }: IndexProps) => {
                   >
                     <RefreshCw className={`w-5 h-5 ${isSyncing ? 'animate-spin' : ''}`} />
                   </Button>
-                  <Popover>
-                    <PopoverTrigger asChild>
+                  <Sheet>
+                    <SheetTrigger asChild>
                       <Button variant="ghost" size="icon">
                         <Settings className="w-5 h-5" />
                       </Button>
-                    </PopoverTrigger>
-                    <PopoverContent className="w-80" align="end">
-                      <div className="space-y-4">
-                        <h4 className="font-medium">Settings</h4>
+                    </SheetTrigger>
+                    <SheetContent side="right" className="w-[300px] sm:w-[350px]">
+                      <div className="space-y-6 py-4">
+                        <div className="space-y-2">
+                          <h4 className="font-semibold text-lg tracking-tight">Settings</h4>
+                          <p className="text-sm text-muted-foreground">
+                            Configure your calendar preferences.
+                          </p>
+                        </div>
 
+                        <div className="space-y-4">
                           <div className="flex items-center justify-between gap-4 pb-4 border-b border-border">
                             <Label htmlFor="use-redesign" className="text-sm cursor-pointer font-medium text-primary">
                               Try New Design
@@ -338,9 +349,14 @@ const Index = ({ defaultTab = 'schedule' }: IndexProps) => {
                           </div>
 
                           <div className="flex items-center justify-between gap-4">
-                          <Label htmlFor="partial-availability" className="text-sm cursor-pointer">
-                            Show partial availability
+                            <div className="space-y-0.5">
+                              <Label htmlFor="partial-availability" className="text-sm font-medium cursor-pointer">
+                                Partial Availability
                               </Label>
+                              <p className="text-xs text-muted-foreground">
+                                Show slots where some are busy
+                              </p>
+                            </div>
                             <Switch
                               id="partial-availability"
                               checked={settings.showPartialAvailability}
@@ -349,11 +365,8 @@ const Index = ({ defaultTab = 'schedule' }: IndexProps) => {
                               }
                             />
                           </div>
-                        <p className="text-xs text-muted-foreground">
-                          When enabled, shows time slots where only some participants are available.
-                        </p>
 
-                        <div className="border-t border-border pt-4">
+                          <div className="border-t border-border pt-4 space-y-4">
                             <div className="flex items-center justify-between gap-4">
                               <Label htmlFor="secondary-timezone" className="text-sm cursor-pointer">
                                 Show secondary timezone
@@ -367,8 +380,8 @@ const Index = ({ defaultTab = 'schedule' }: IndexProps) => {
                               />
                             </div>
                             {settings.showSecondaryTimezone && (
-                            <div className="mt-3">
-                              <Label className="text-xs text-muted-foreground mb-2 block">
+                              <div className="space-y-2">
+                                <Label className="text-xs text-muted-foreground block">
                                   Secondary timezone
                                 </Label>
                                 <TimezoneSelector
@@ -377,18 +390,18 @@ const Index = ({ defaultTab = 'schedule' }: IndexProps) => {
                                 />
                               </div>
                             )}
-                          <p className="text-xs text-muted-foreground mt-2">
-                            Display times in two timezones side by side.
-                          </p>
                           </div>
 
-                        <div className="border-t border-border pt-4">
+                          <div className="border-t border-border pt-4 mt-8">
+                            <Label className="text-xs font-semibold text-muted-foreground uppercase tracking-wider mb-3 block">
+                              Danger Zone
+                            </Label>
                             <AlertDialog>
                               <AlertDialogTrigger asChild>
                                 <Button
-                                variant="destructive"
+                                  variant="outline"
                                   size="sm"
-                                className="w-full"
+                                  className="text-destructive hover:text-destructive-foreground hover:bg-destructive border-destructive/30"
                                 >
                                   Clear All Bookings
                                 </Button>
@@ -397,9 +410,7 @@ const Index = ({ defaultTab = 'schedule' }: IndexProps) => {
                                 <AlertDialogHeader>
                                   <AlertDialogTitle>Clear all bookings?</AlertDialogTitle>
                                   <AlertDialogDescription>
-                                  This will remove all scheduled meetings from the system.
-                                  This action cannot be undone. Calendar invites already
-                                  sent will not be affected.
+                                    This will remove all scheduled meetings. This cannot be undone.
                                   </AlertDialogDescription>
                                 </AlertDialogHeader>
                                 <AlertDialogFooter>
@@ -413,13 +424,11 @@ const Index = ({ defaultTab = 'schedule' }: IndexProps) => {
                                 </AlertDialogFooter>
                               </AlertDialogContent>
                             </AlertDialog>
-                          <p className="text-xs text-muted-foreground mt-2">
-                            Remove all scheduled meetings from the system.
-                          </p>
                           </div>
                         </div>
-                    </PopoverContent>
-                  </Popover>
+                      </div>
+                    </SheetContent>
+                  </Sheet>
                 </div>
                 <h2 className="text-3xl font-bold text-foreground mb-2">
                   Schedule a Meeting

frontend/src/types/calendar.ts

@@ -11,6 +11,7 @@ export interface Participant {
 export interface TimeSlot {
   day: string;
   hour: number;
+  minute: number;
   start_time: string;
   availability: 'full' | 'partial' | 'none';
   availableParticipants: string[];