feat: add worktree source control review

[jln13x]

Summary

• add a VS Code-style worktree source control view with staged and unstaged sections
• support file/all stage and unstage actions, confirmed discard, refresh, and single/all-file diffs
• reuse the annotatable diff renderer so line comments can continue into chat
• keep review comments in an isolated temporary draft until the user explicitly continues into chat
• preserve upstream behavior behind the enableWorktreeSourceControl personal-fork flag

Regression review

• rebased onto the latest personal branch
• prevented opening the viewer from silently retargeting an existing chat draft or changing its branch
• fixed compact nested rename paths so staged renames appear once under their destination path
• carried the existing oversized-line render guard into the worktree viewer
• removed unused rename metadata from the public status contract

Verification

• vp check
• vp run typecheck
• vp run lint:mobile
• vp test apps/server/src/vcs/GitVcsDriverCore.test.ts (41 tests)
• focused web/contracts/mobile tests (127 tests)
• vp run --filter @t3tools/web build

vp check reports only the repository's existing lint warnings; it has zero errors.