feat: auto-refresh file tree on filesystem changes

[BunsDev]

Summary

• Adds a server-side fs.watch watcher on the workspace directory that detects file creates, deletes, and modifications
• Pushes debounced (300ms) change events via a new project.fileTreeChanged WebSocket push channel
• Client subscribes and invalidates all project React Query caches, causing the file tree to re-render automatically
• Ignores noisy directories (.git, node_modules, dist, etc.) and clears the server-side workspace index cache on changes

Test plan

• Create a new file in the workspace via terminal — verify it appears in the file tree without manual refresh
• Delete a file via terminal or external editor — verify it disappears from the tree
• Run git checkout to a different branch — verify the tree updates to reflect the new branch's files
• Run npm install — verify the tree doesn't flood with events (debouncing works)
• Verify changes inside .git and node_modules do not trigger tree refreshes

🤖 Generated with Claude Code

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