[Bug] Auto-linkified file paths don't validate resolution before clickification

Bug Description
Auto-linkified file paths in chat are clickable even when they don't resolve, and clicking fails silently. When the assistant writes an inline code span that looks like a path (e.g. references/foo.md), the desktop client turns it into a highlighted, right-clickable file token (Copy path / Open in…). But it never checks whether the path actually resolves to a file in the session's working directory. If the path is wrong or relative to a different base, clicking does nothing — no file opens, no error, no feedback. Expected: either don't linkify a path that doesn't resolve, or on an unresolvable click show "File not found: <path>" instead of silently doing nothing.

Environment Info

• Platform: darwin
• Terminal: Apple_Terminal
• Version: 2.1.195
• Feedback ID: 95fe026b-180d-498d-ac96-20898dcb565a

Errors

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