feat(ui): make edited file references clickable in desktop session UI

[anduimagui]

Summary

• add openFilePath support to the shared UI data context and wire it in app-level providers
• detect inline code file references (including path:line and file:// forms) in markdown, render them as clickable in-message links, and route clicks to open files in the session panel
• make file names in edit, write, and apply_patch tool cards clickable so users can open changed/created files directly from tool output

Verification

• bun run typecheck in packages/ui
• pre-push hook (bun turbo typecheck) completed successfully before push

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