Fix worktrees failing to open on WSL: translate POSIX worktree paths to UNC

[flix-wg]

Fixes #62.

Problem

Worktrees on a WSL repo fail to open (\home\... invalid). git returns POSIX worktree paths; upstream parseWorktreePorcelainOutput runs them through Path.normalize, which on Windows only flips separators (/home → \home) without adding a volume, leaving a rootless path Windows can't resolve. The repo path works because it comes from the folder picker (correct UNC); only git-discovered worktree paths are left untranslated. Full analysis in #62.

Change

New patch patches/07-worktree-path-translation.patch, following the numbered git apply convention. Two hunks, entirely within the fork's own code:

app/src/lib/wsl.ts — add two exported helpers:

• linuxPathToWSL(distro, linuxPath) — inverse of parseWSLPath; builds \\wsl.localhost\<distro>\....
• isRootlessPosixPath(p) — true for a POSIX-rooted path, including the backslash-flipped form Path.normalize yields on Windows (\home\..., a single leading backslash, not a \\ UNC path). Drive-letter and UNC paths return false.

app/src/lib/git/worktree.ts — in listWorktrees (not the parser): the parser only receives stdout and has no repo context, whereas listWorktrees has the Repository → .path → distro. After parsing, if the repo is a WSL path, lift rootless worktree entry paths to UNC.

Design guards

• Distro derived from the parent repo's UNC path via parseWSLPath — never hardcoded (Ubuntu, etc.).
• Translate only when the repo is WSL (isWSLPath) and the entry path is rootless. Native Windows paths pass untouched.
• Guards on the post-Path.normalize form: on Windows the path is already \home\..., so a naive startsWith('/') check would miss it — isRootlessPosixPath handles both /home and \home.
• Assumes the worktree lives on the same distro as its parent (true for the normal case and for .claude/worktrees/). Cross-distro worktrees would get the wrong prefix — documented known edge, not handled.
• Scoped to worktrees; submodule paths (submodule.ts) likely share the bug — flagged as a separate follow-up in Worktrees fail to open: worktree paths not translated POSIX→UNC (\home\... invalid) #62, not touched here.

Verification

• Patches 01–07 apply cleanly with git apply against a pristine desktop/desktop@release-3.6.2 checkout (current latest upstream release-* tag). Hunks use minimal, stable context anchors.
• No upstream automated test suite for this path → manual E2E (I cannot run the Windows build here; leaving final E2E to a WSL+Windows environment):
  1. In WSL, create a repo with ≥1 worktree (git worktree add).
  2. Add the parent repo in the built app.
  3. Confirm each worktree opens, shows the correct branch, and diffs load.
  4. Before/after screenshots.

Risk

Patch fragility — CI applies patches with strict git apply against each new release-* every 6h. The worktree.ts hunk is anchored on the stable listWorktrees shape; re-diff if upstream restructures it. Re-verify against the live tag at merge time (do not assume 3.6.2 if a newer tag has shipped).

🤖 Generated with Claude Code

[flix-wg]

Still needs testing :)