feat: implement tabbed interface for room edit dialog

- Add General, Calendar, and Share tabs to organize room settings
- Move ICS settings to dedicated Calendar tab
- Move Zulip configuration to Share tab
- Keep basic room settings and webhooks in General tab
- Remove redundant migration file
- Fix Chakra UI v3 compatibility issues in calendar components

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

www/app/(app)/rooms/_components/ICSSettings.tsx

@@ -143,11 +143,7 @@ export default function ICSSettings({
   }
 
   return (
-    <VStack gap={4} align="stretch" mt={6}>
-      <Text fontWeight="semibold" fontSize="lg">
-        Calendar Integration (ICS)
-      </Text>
-
+    <VStack gap={4} align="stretch">
       <Field.Root>
         <Checkbox.Root
           checked={icsEnabled}