[Feature] Add the chat panel

[CREDO23]

Description

• Add a right panel for the chat
• User can directly generate a podcast for the chat
• User can re-generate the podcast when it is stale (based on the chat messages)

Screenshots

Change Type

• Bug fix
• New feature
• Performance improvement
• Refactoring
• Documentation
• Dependency/Build system
• Breaking change
• Other (specify):###

High-level PR Summary

This PR introduces a collapsible right panel in the chat interface that allows users to generate podcasts directly from their chat conversations. The feature includes a podcast staleness detection system that tracks when chat messages are updated after podcast generation, alerting users when a podcast is outdated and enabling regeneration. The implementation involves database schema changes to track chat and podcast state versions, backend API endpoints to fetch podcasts by chat ID, and frontend components for the panel UI with staleness indicators and podcast generation controls.

⏱️ Estimated Review Time: 30-90 minutes

💡 Review Order Suggestion

Order	File Path
1	surfsense_backend/alembic/versions/32_add_podcast_staleness_detection.py
2	surfsense_backend/app/db.py
3	surfsense_backend/app/schemas/chats.py
4	surfsense_backend/app/schemas/podcasts.py
5	surfsense_backend/app/routes/chats_routes.py
6	surfsense_backend/app/routes/podcasts_routes.py
7	surfsense_backend/app/tasks/podcast_tasks.py
8	surfsense_web/components/chat/PodcastUtils.ts
9	surfsense_web/hooks/use-podcast.ts
10	surfsense_web/app/dashboard/[search_space_id]/chats/chats-client.tsx
11	surfsense_web/app/dashboard/[search_space_id]/podcasts/podcasts-client.tsx
12	surfsense_web/hooks/use-chat.ts
13	surfsense_web/components/chat/ChatInterface.tsx
14	surfsense_web/components/chat/ChatPanel/ChatPanelContainer.tsx
15	surfsense_web/components/chat/ChatPanel/ChatPanelView.tsx
16	surfsense_web/components/chat/ChatPanel/ConfigModal.tsx
17	surfsense_web/package.json

⚠️ Inconsistent Changes Detected

File Path	Warning
surfsense_web/package.json	Adding a new script command 'format:fix' for Biome code formatting is unrelated to the podcast generation right panel feature

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✨ Finishing touches

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[recurseml]

Review by RecurseML

🔍 Review performed on 420e2b6..3dd03a8

✨ No bugs found, your code is sparkling clean

✅ Files analyzed, no issues (16)

• surfsense_backend/alembic/versions/32_add_podcast_staleness_detection.py
• surfsense_backend/app/db.py
• surfsense_backend/app/routes/chats_routes.py
• surfsense_backend/app/routes/podcasts_routes.py
• surfsense_backend/app/schemas/chats.py
• surfsense_backend/app/schemas/podcasts.py
• surfsense_backend/app/tasks/podcast_tasks.py
• surfsense_web/app/dashboard/[search_space_id]/chats/chats-client.tsx
• surfsense_web/app/dashboard/[search_space_id]/podcasts/podcasts-client.tsx
• surfsense_web/components/chat/ChatPanel/ChatPanelContainer.tsx
• surfsense_web/components/chat/ChatPanel/ChatPanelView.tsx
• surfsense_web/components/chat/ChatPanel/ConfigModal.tsx
• surfsense_web/components/chat/PodcastUtils.ts
• surfsense_web/hooks/use-chat.ts
• surfsense_web/hooks/use-podcast.ts
• surfsense_web/package.json

[MODSetter]

1. New chat doesn't have any podcast so we get this err on new chat

2. Revisit after podcast generation gives these errors

3. Remove the seperate podcast section and just move the podcast player on this new right sidebar

4. Please make sure you keep your branch synced with main so that I can test it easily.

[recurseml]

Review by RecurseML

🔍 Review performed on 3dd03a8..031e5db

✨ No bugs found, your code is sparkling clean

✅ Files analyzed, no issues (2)

• surfsense_web/components/chat/ChatInterface.tsx
• surfsense_web/components/chat/ChatPanel/ChatPanelView.tsx