[Feature Request] Add @git support to reference uncommitted changes

Bug Description
Can we add @git support to reference all uncommited changes, just like cursor has ? i use this a lot

Environment Info

• Platform: darwin
• Terminal: Apple_Terminal
• Version: 2.0.69
• Feedback ID: a1bf4cff-1793-4c68-9586-429fc904db00

Errors

[{"error":"Error: NON-FATAL: Lock acquisition failed for /Users/vkrishnaprasad/.local/share/claude/versions/2.0.69 (expected in multi-process scenarios)\n    at j8R (/$bunfs/root/claude:2242:2155)\n    at H_A (/$bunfs/root/claude:2242:1875)\n    at processTicksAndRejections (native:7:39)","timestamp":"2025-12-15T16:47:08.590Z"}]