feat: add git status, git remote, worktree, and custom symbol widgets

[hangie]

Summary

Split out from #255 per reviewer request — widgets only, no rules engine.

• Git status widgets (addresses Add enhanced git status options to git widgets #20): git-status, git-staged, git-unstaged, git-untracked, git-ahead-behind, git-conflicts, git-sha
• Git remote widgets: git-origin-owner, git-origin-repo, git-origin-owner-repo, git-upstream-owner, git-upstream-repo, git-upstream-owner-repo, git-is-fork
• Worktree widgets: worktree-mode, worktree-name, worktree-branch, worktree-original-branch
• Custom symbol widget: configurable symbol display

Supporting changes

• Git command cache for performance
• Git status/ahead-behind/conflict/sha utility functions
• Git remote URL parsing and fork detection utilities
• customSymbol, hide, getNumericValue() type additions
• worktree field in StatusJSON, gitData field in RenderContext

Test plan

• All 630 tests pass (bun test)
• TypeScript compiles cleanly (bun run lint)
• New git-remote utility tests (~297 lines of coverage)
• New git status widget tests
• Existing tests updated with clearGitCache for test isolation
• Manual TUI testing of new widgets

🤖 Generated with Claude Code

[hangie]

Git Status Detection Fixes Applied

Added two commits to fix git status detection issues:

Commit 1: Fix git status detection for unstaged changes and merge conflicts (f89076b)

Fixed three critical bugs in git status parsing:

1. Incomplete unstaged pattern - Changed from /^.[MD]/ to /^.[MADRCTU]/

   • Previously only detected Modified and Deleted in working tree
   • Now correctly detects all status codes including merge conflicts (UU, AU, DU, AA, UA, UD) and other changes (R, C, T)

2. Added -z flag - Changed to git status --porcelain -z with NUL-terminated output

   • Properly handles filenames with spaces and special characters
   • More robust parsing with split('\0') instead of split('\n')

3. Fixed .trim() removing significant spaces - Changed from .trim() to .trimEnd()

   • Preserves significant leading spaces in git porcelain format
   • Example: M file.txt (space + M = unstaged modification) was incorrectly trimmed to M file.txt (staged modification)

Added 20+ comprehensive test cases covering all merge conflict scenarios, edge cases, and status combinations.

Commit 2: Add conflict detection to git status widget (ca724bb)

Enhanced GitStatus widget to show merge conflicts:

• Added ! indicator for merge conflicts (shown first, highest priority)
• Priority ordering: !+*? reflects urgency:
  • ! — conflicts (blocking, must resolve first)
  • + — staged (intentional work in progress)
  • * — unstaged (reminder of unsaved work)
  • ? — untracked (least urgent, undecided files)

Detects all merge conflict states: DD, AU, UD, UA, DU, AA, UU

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All tests pass (37 git-related tests with 82+ assertions)

[sirmalloc]

Thanks for this, I'll publish it when the next release goes out.