diff --git a/www/app/(app)/browse/_components/FilterSidebar.tsx b/www/app/(app)/browse/_components/FilterSidebar.tsx
index 6a440a10..8aa77095 100644
--- a/www/app/(app)/browse/_components/FilterSidebar.tsx
+++ b/www/app/(app)/browse/_components/FilterSidebar.tsx
@@ -47,7 +47,7 @@ export default function FilterSidebar({
                 key={room.id}
                 as={NextLink}
                 href="#"
-                onClick={() => onFilterChange("room" as SourceKind, room.id)}
+                onClick={() => onFilterChange("room", room.id)}
                 color={
                   selectedSourceKind === "room" && selectedRoomId === room.id
                     ? "blue.500"
diff --git a/www/app/(app)/browse/page.tsx b/www/app/(app)/browse/page.tsx
index ca63d0a6..21e364bb 100644
--- a/www/app/(app)/browse/page.tsx
+++ b/www/app/(app)/browse/page.tsx
@@ -203,7 +203,11 @@ export default function TranscriptBrowser() {
 
   const [urlSourceKind, setUrlSourceKind] = useQueryState(
     "source",
-    parseAsStringLiteral(["room", "live", "file"] as const).withOptions({
+    parseAsStringLiteral([
+      "room",
+      "live",
+      "file",
+    ] as const satisfies SourceKind[]).withOptions({
       shallow: false,
     }),
   );
diff --git a/www/app/(app)/rooms/page.tsx b/www/app/(app)/rooms/page.tsx
index 3d96ffeb..1631e689 100644
--- a/www/app/(app)/rooms/page.tsx
+++ b/www/app/(app)/rooms/page.tsx
@@ -93,33 +93,26 @@ export default function RoomsList() {
   const createRoomMutation = useRoomCreate();
   const updateRoomMutation = useRoomUpdate();
   const deleteRoomMutation = useRoomDelete();
-  const { data: streams = [] } = useZulipStreams() as { data: any[] };
-  const { data: topics = [] } = useZulipTopics(selectedStreamId) as {
-    data: Topic[];
-  };
-  interface Topic {
-    name: string;
-  }
+  const { data: streams = [] } = useZulipStreams();
+  const { data: topics = [] } = useZulipTopics(selectedStreamId);
 
   // Update selected stream ID when zulip stream changes
   useEffect(() => {
     if (room.zulipStream && streams.length > 0) {
-      const selectedStream = streams.find(
-        (s: any) => s.name === room.zulipStream,
-      );
-      if (selectedStream) {
-        setSelectedStreamId((selectedStream as any).stream_id);
+      const selectedStream = streams.find((s) => s.name === room.zulipStream);
+      if (selectedStream !== undefined) {
+        setSelectedStreamId(selectedStream.stream_id);
       }
     } else {
       setSelectedStreamId(null);
     }
   }, [room.zulipStream, streams]);
 
-  const streamOptions: SelectOption[] = streams.map((stream: any) => {
+  const streamOptions: SelectOption[] = streams.map((stream) => {
     return { label: stream.name, value: stream.name };
   });
 
-  const topicOptions: SelectOption[] = topics.map((topic: any) => ({
+  const topicOptions: SelectOption[] = topics.map((topic) => ({
     label: topic.name,
     value: topic.name,
   }));
diff --git a/www/app/(app)/rooms/useRoomList.tsx b/www/app/(app)/rooms/useRoomList.tsx
index fb655b9b..4cf364c1 100644
--- a/www/app/(app)/rooms/useRoomList.tsx
+++ b/www/app/(app)/rooms/useRoomList.tsx
@@ -11,6 +11,12 @@ type RoomList = {
   refetch: () => void;
 };
 
+type ValidationError = components["schemas"]["ValidationError"];
+
+const formatValidationErrors = (errors: ValidationError[]) => {
+  return errors.map((error) => error.msg).join(", ");
+};
+
 // Wrapper to maintain backward compatibility
 const useRoomList = (page: PaginationPage): RoomList => {
   const { data, isLoading, error, refetch } = useRoomsList(page);
@@ -18,7 +24,11 @@ const useRoomList = (page: PaginationPage): RoomList => {
   return {
     response: data || null,
     loading: isLoading,
-    error: error as Error | null,
+    error: error
+      ? new Error(
+          error.detail ? formatValidationErrors(error.detail) : undefined,
+        )
+      : null,
     refetch,
   };
 };
diff --git a/www/app/(app)/transcripts/[transcriptId]/page.tsx b/www/app/(app)/transcripts/[transcriptId]/page.tsx
index 3e55f5cb..ce48e951 100644
--- a/www/app/(app)/transcripts/[transcriptId]/page.tsx
+++ b/www/app/(app)/transcripts/[transcriptId]/page.tsx
@@ -86,7 +86,7 @@ export default function TranscriptDetails(details: TranscriptDetails) {
                 useActiveTopic={useActiveTopic}
                 waveform={waveform.waveform}
                 media={mp3.media}
-                mediaDuration={transcript.response?.duration}
+                mediaDuration={transcript.response?.duration || null}
               />
             ) : !mp3.loading && (waveform.error || mp3.error) ? (
               <Box p={4} bg="red.100" borderRadius="md">
diff --git a/www/app/(app)/transcripts/player.tsx b/www/app/(app)/transcripts/player.tsx
index 4e1c0a7c..10b02aa1 100644
--- a/www/app/(app)/transcripts/player.tsx
+++ b/www/app/(app)/transcripts/player.tsx
@@ -20,7 +20,7 @@ type PlayerProps = {
   ];
   waveform: AudioWaveform;
   media: HTMLMediaElement;
-  mediaDuration: number;
+  mediaDuration: number | null;
 };
 
 export default function Player(props: PlayerProps) {
@@ -52,7 +52,9 @@ export default function Player(props: PlayerProps) {
         container: waveformRef.current,
         peaks: [props.waveform.data],
         height: "auto",
-        duration: Math.floor(props.mediaDuration / 1000),
+        duration: props.mediaDuration
+          ? Math.floor(props.mediaDuration / 1000)
+          : undefined,
         media: props.media,
 
         ...waveSurferStyles.playerSettings,
diff --git a/www/app/(app)/transcripts/shareAndPrivacy.tsx b/www/app/(app)/transcripts/shareAndPrivacy.tsx
index 6304f057..43a61753 100644
--- a/www/app/(app)/transcripts/shareAndPrivacy.tsx
+++ b/www/app/(app)/transcripts/shareAndPrivacy.tsx
@@ -76,7 +76,7 @@ export default function ShareAndPrivacy(props: ShareAndPrivacyProps) {
       });
       setShareMode(
         shareOptionsData.find(
-          (option) => option.value === (updatedTranscript as any).share_mode,
+          (option) => option.value === updatedTranscript.share_mode,
         ) || shareOptionsData[0],
       );
     } catch (err) {
diff --git a/www/app/(app)/transcripts/shareZulip.tsx b/www/app/(app)/transcripts/shareZulip.tsx
index 2293bf27..3c3b1ea4 100644
--- a/www/app/(app)/transcripts/shareZulip.tsx
+++ b/www/app/(app)/transcripts/shareZulip.tsx
@@ -15,7 +15,6 @@ import {
   Checkbox,
   Combobox,
   Spinner,
-  Portal,
   useFilter,
   useListCollection,
 } from "@chakra-ui/react";
@@ -37,10 +36,6 @@ interface Stream {
   name: string;
 }
 
-interface Topic {
-  name: string;
-}
-
 export default function ShareZulip(props: ShareZulipProps & BoxProps) {
   const [showModal, setShowModal] = useState(false);
   const [stream, setStream] = useState<string | undefined>(undefined);
@@ -49,26 +44,23 @@ export default function ShareZulip(props: ShareZulipProps & BoxProps) {
   const [includeTopics, setIncludeTopics] = useState(false);
 
   // React Query hooks
-  const { data: streams = [], isLoading: isLoadingStreams } =
-    useZulipStreams() as { data: Stream[]; isLoading: boolean };
-  const { data: topics = [] } = useZulipTopics(selectedStreamId) as {
-    data: Topic[];
-  };
+  const { data: streams = [], isLoading: isLoadingStreams } = useZulipStreams();
+  const { data: topics = [] } = useZulipTopics(selectedStreamId);
   const postToZulipMutation = useTranscriptPostToZulip();
 
   const { contains } = useFilter({ sensitivity: "base" });
 
   const streamItems = useMemo(() => {
-    return (streams || []).map((stream: Stream) => ({
+    return streams.map((stream: Stream) => ({
       label: stream.name,
       value: stream.name,
     }));
   }, [streams]);
 
   const topicItems = useMemo(() => {
-    return (topics || []).map((topic: Topic) => ({
-      label: topic.name,
-      value: topic.name,
+    return topics.map(({ name }) => ({
+      label: name,
+      value: name,
     }));
   }, [topics]);
 
diff --git a/www/app/(app)/transcripts/useParticipants.ts b/www/app/(app)/transcripts/useParticipants.ts
index f45970c4..a3674597 100644
--- a/www/app/(app)/transcripts/useParticipants.ts
+++ b/www/app/(app)/transcripts/useParticipants.ts
@@ -41,7 +41,7 @@ const useParticipants = (transcriptId: string): UseParticipants => {
       loading: false,
       response: null,
       refetch,
-    } as ErrorParticipants & { refetch: () => void };
+    } satisfies ErrorParticipants & { refetch: () => void };
   }
 
   if (loading || !response) {
@@ -50,7 +50,7 @@ const useParticipants = (transcriptId: string): UseParticipants => {
       loading: true,
       error: null,
       refetch,
-    } as LoadingParticipants & { refetch: () => void };
+    } satisfies LoadingParticipants & { refetch: () => void };
   }
 
   return {
@@ -58,7 +58,7 @@ const useParticipants = (transcriptId: string): UseParticipants => {
     loading: false,
     error: null,
     refetch,
-  } as SuccessParticipants & { refetch: () => void };
+  } satisfies SuccessParticipants & { refetch: () => void };
 };
 
 export default useParticipants;
diff --git a/www/app/(app)/transcripts/useTopicWithWords.ts b/www/app/(app)/transcripts/useTopicWithWords.ts
index d5177f6f..31e184cc 100644
--- a/www/app/(app)/transcripts/useTopicWithWords.ts
+++ b/www/app/(app)/transcripts/useTopicWithWords.ts
@@ -42,14 +42,13 @@ const useTopicWithWords = (
     topicId || null,
   );
 
-  // Type-safe return based on state
   if (error) {
     return {
       error: error as Error,
       loading: false,
       response: null,
       refetch,
-    } as ErrorTopicWithWords & { refetch: () => void };
+    } satisfies ErrorTopicWithWords & { refetch: () => void };
   }
 
   if (loading || !response) {
@@ -58,7 +57,7 @@ const useTopicWithWords = (
       loading: true,
       error: false,
       refetch,
-    } as LoadingTopicWithWords & { refetch: () => void };
+    } satisfies LoadingTopicWithWords & { refetch: () => void };
   }
 
   return {
@@ -66,7 +65,7 @@ const useTopicWithWords = (
     loading: false,
     error: null,
     refetch,
-  } as SuccessTopicWithWords & { refetch: () => void };
+  } satisfies SuccessTopicWithWords & { refetch: () => void };
 };
 
 export default useTopicWithWords;
diff --git a/www/app/(app)/transcripts/useTranscript.ts b/www/app/(app)/transcripts/useTranscript.ts
index 9d4a18e1..3e56fb9e 100644
--- a/www/app/(app)/transcripts/useTranscript.ts
+++ b/www/app/(app)/transcripts/useTranscript.ts
@@ -59,7 +59,7 @@ const useTranscript = (
   }
 
   return {
-    response: data as GetTranscript,
+    response: data,
     loading: false,
     error: null,
     reload: refetch,
diff --git a/www/app/(app)/transcripts/useWebRTC.ts b/www/app/(app)/transcripts/useWebRTC.ts
index 077f26c0..89a2a946 100644
--- a/www/app/(app)/transcripts/useWebRTC.ts
+++ b/www/app/(app)/transcripts/useWebRTC.ts
@@ -11,7 +11,7 @@ const useWebRTC = (
 ): Peer => {
   const [peer, setPeer] = useState<Peer | null>(null);
   const { setError } = useError();
-  const webRTCMutation = useTranscriptWebRTC();
+  const { mutateAsync: mutateWebRtcTranscriptAsync } = useTranscriptWebRTC();
 
   useEffect(() => {
     if (!stream || !transcriptId) {
@@ -41,7 +41,7 @@ const useWebRTC = (
         };
 
         try {
-          const answer = await webRTCMutation.mutateAsync({
+          const answer = await mutateWebRtcTranscriptAsync({
             params: {
               path: {
                 transcript_id: transcriptId,
@@ -69,7 +69,7 @@ const useWebRTC = (
     return () => {
       p.destroy();
     };
-  }, [stream, transcriptId, webRTCMutation]);
+  }, [stream, transcriptId, mutateWebRtcTranscriptAsync]);
 
   return peer;
 };
diff --git a/www/app/lib/apiHooks.ts b/www/app/lib/apiHooks.ts
index 965c6dfc..519512a8 100644
--- a/www/app/lib/apiHooks.ts
+++ b/www/app/lib/apiHooks.ts
@@ -3,7 +3,7 @@
 import { $api } from "./apiClient";
 import { useError } from "../(errors)/errorContext";
 import { useQueryClient } from "@tanstack/react-query";
-import type { paths } from "../reflector-api";
+import type { components, paths } from "../reflector-api";
 import useAuthReady from "./useAuthReady";
 
 // FIXME: React Query caching issues with cross-tab synchronization
@@ -23,7 +23,6 @@ import useAuthReady from "./useAuthReady";
 const STALE_TIME = 500;
 
 export function useRoomsList(page: number = 1) {
-  const { setError } = useError();
   const { isAuthReady } = useAuthReady();
 
   return $api.useQuery(
@@ -41,16 +40,17 @@ export function useRoomsList(page: number = 1) {
   );
 }
 
+type SourceKind = components["schemas"]["SourceKind"];
+
 export function useTranscriptsSearch(
   q: string = "",
   options: {
     limit?: number;
     offset?: number;
     room_id?: string;
-    source_kind?: string;
+    source_kind?: SourceKind;
   } = {},
 ) {
-  const { setError } = useError();
   const { isAuthReady } = useAuthReady();
 
   return $api.useQuery(
@@ -63,7 +63,7 @@ export function useTranscriptsSearch(
           limit: options.limit,
           offset: options.offset,
           room_id: options.room_id,
-          source_kind: options.source_kind as any,
+          source_kind: options.source_kind,
         },
       },
     },
@@ -101,7 +101,6 @@ export function useTranscriptProcess() {
 }
 
 export function useTranscriptGet(transcriptId: string | null) {
-  const { setError } = useError();
   const { isAuthReady } = useAuthReady();
 
   return $api.useQuery(
@@ -170,12 +169,11 @@ export function useRoomDelete() {
 }
 
 export function useZulipStreams() {
-  const { setError } = useError();
   const { isAuthReady } = useAuthReady();
 
   return $api.useQuery(
     "get",
-    "/v1/zulip/streams" as any,
+    "/v1/zulip/streams",
     {},
     {
       enabled: isAuthReady,
@@ -185,15 +183,20 @@ export function useZulipStreams() {
 }
 
 export function useZulipTopics(streamId: number | null) {
-  const { setError } = useError();
   const { isAuthReady } = useAuthReady();
-
+  const enabled = !!streamId && isAuthReady;
   return $api.useQuery(
     "get",
-    streamId ? (`/v1/zulip/streams/${streamId}/topics` as any) : null,
-    {},
+    "/v1/zulip/streams/{stream_id}/topics",
     {
-      enabled: !!streamId && isAuthReady,
+      params: {
+        path: {
+          stream_id: enabled ? streamId : 0,
+        },
+      },
+    },
+    {
+      enabled,
       staleTime: STALE_TIME,
     },
   );
@@ -223,15 +226,11 @@ export function useTranscriptPostToZulip() {
   const { setError } = useError();
 
   // @ts-ignore - Zulip endpoint not in OpenAPI spec
-  return $api.useMutation(
-    "post",
-    "/v1/transcripts/{transcript_id}/zulip" as any,
-    {
-      onError: (error) => {
-        setError(error as Error, "There was an error posting to Zulip");
-      },
+  return $api.useMutation("post", "/v1/transcripts/{transcript_id}/zulip", {
+    onError: (error) => {
+      setError(error as Error, "There was an error posting to Zulip");
     },
-  );
+  });
 }
 
 export function useTranscriptUploadAudio() {
@@ -263,7 +262,6 @@ export function useTranscriptUploadAudio() {
 }
 
 export function useTranscriptWaveform(transcriptId: string | null) {
-  const { setError } = useError();
   const { isAuthReady } = useAuthReady();
 
   return $api.useQuery(
@@ -282,7 +280,6 @@ export function useTranscriptWaveform(transcriptId: string | null) {
 }
 
 export function useTranscriptMP3(transcriptId: string | null) {
-  const { setError } = useError();
   const { isAuthReady } = useAuthReady();
 
   return $api.useQuery(
@@ -301,7 +298,6 @@ export function useTranscriptMP3(transcriptId: string | null) {
 }
 
 export function useTranscriptTopics(transcriptId: string | null) {
-  const { setError } = useError();
   const { isAuthReady } = useAuthReady();
 
   return $api.useQuery(
@@ -320,7 +316,6 @@ export function useTranscriptTopics(transcriptId: string | null) {
 }
 
 export function useTranscriptTopicsWithWords(transcriptId: string | null) {
-  const { setError } = useError();
   const { isAuthReady } = useAuthReady();
 
   return $api.useQuery(
@@ -342,7 +337,6 @@ export function useTranscriptTopicsWithWordsPerSpeaker(
   transcriptId: string | null,
   topicId: string | null,
 ) {
-  const { setError } = useError();
   const { isAuthReady } = useAuthReady();
 
   return $api.useQuery(
@@ -364,7 +358,6 @@ export function useTranscriptTopicsWithWordsPerSpeaker(
 }
 
 export function useTranscriptParticipants(transcriptId: string | null) {
-  const { setError } = useError();
   const { isAuthReady } = useAuthReady();
 
   return $api.useQuery(
diff --git a/www/app/lib/useSessionStatus.ts b/www/app/lib/useSessionStatus.ts
index 5629c025..a56691b2 100644
--- a/www/app/lib/useSessionStatus.ts
+++ b/www/app/lib/useSessionStatus.ts
@@ -6,7 +6,7 @@ import { Session } from "next-auth";
 
 export default function useSessionStatus() {
   const { status: naStatus } = useNextAuthSession();
-  const [status, setStatus] = useState("loading");
+  const [status, setStatus] = useState<typeof naStatus>("loading");
 
   useEffect(() => {
     if (naStatus !== "loading" && naStatus !== status) {