feat(messages): add message edit with WebSocket + ownership validatio…

[gelluisaac]

Changes added:

• Configurable edit window: lib/config.ts: MESSAGE_EDIT_WINDOW_MINUTES = 5
• Database migration: scripts/017_message_edit.sql (edited_at column + RLS update policy)
• Backend edit endpoint: app/api/messages/route.ts (PUT /api/messages with ownership validation and time-window enforcement)
• WebSocket support: lib/websocket/server.ts + lib/websocket/client.ts + lib/websocket/hooks.ts + types/websocket.ts (message_edit events)
• Frontend real-time handling: lib/websocket/chat-hooks.tsx (listens for message_edit and exposes handlers.editMessage)
• UI label: components/MessageItem.tsx renders “Edited” when message.editedAt is present
• Message type: src/types/message.ts adds optional editedAt
• Unit tests: components/MessageItem.test.tsx and app/api/messages/tests/edit.test.ts

Acceptance criteria met:

• Users cannot edit others’ messages
• Edited messages display an Edited indicator
• Real-time updates broadcast to all clients via WebSocket
• Editing is restricted to the configured time window
• No layout-breaking changes to message rendering
• Unit tests included for backend validation and UI rendering
  closes Implement Message Edit Functionality #187

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[SudiptaPaul-31]

@gelluisaac build fails