fix: address Copilot review (9 comments)

#1 GitView: hide/disable 'open in editor' for external linked worktrees
   (path outside session workspace is rejected by the fence); add
   isWithinWorkspace client helper for the gate.
#2 DiffTab: untracked diff read resolves against diff.repoRoot (child-repo
   paths are repo-root-relative, not cwd-relative); fs.read route threads
   selectedRepoOf into resolveGitPath so the host resolves the right base.
#3 GitView: chooseRepo handler mirrors chooseWorktree — clears status/
   history/log and bumps generation before async refresh, preventing stale
   rows from acting on the newly selected repository.
#4 git.ts: repoRoots/repoRoot compare roots via pathIdentity() (platform-
   aware) instead of raw includes(), fixing win32 forward/backslash
   mismatch that silently fell back to roots[0].
#5 markdown-images: mask fenced code blocks and inline code spans before
   rewriting; only rewrite reference definitions whose label is actually
   referenced by image syntax (not plain links). +3 tests.
#6 package.json: downgrade unrun ^0.3.1 → ^0.2.39 (0.3.x requires Node
   ^22.13, incompatible with declared engines >=20).
#7 market-manifest.spec: shell:true on win32 so execFileSync resolves the
   pnpm .cmd shim.
#8 smoke.spec: build html-route URL via encodeHtmlUrl() (production
   encoder) so the Windows drive separator is correct.
#9 index.ts git.worktrees route: thread selectedRepoOf so a workspace
   container's selected child repo's linked worktrees appear.

tests/markdown-images.spec.ts

@@ -70,4 +70,31 @@ describe('rewriteLocalImageUrls', () => {
     expect(url).toContain('/sidebar/file?')
     expect(decodeURIComponent(url)).toContain('C:\\repo\\img.png')
   })
+
+  it('does not rewrite image-looking text inside fenced code blocks', () => {
+    const md = '```\n![alt](./img.png)\n```\n![real](./real.png)'
+    const out = rewriteLocalImageUrls(md, scope, '/repo/readme.md', ORIGIN)
+    // The fenced example must be preserved verbatim; only the real image is rewritten.
+    expect(out).toContain('```\n![alt](./img.png)\n```')
+    expect(out).toContain('/sidebar/file?')
+  })
+
+  it('does not rewrite image-looking text inside inline code spans', () => {
+    const md = 'Use `![alt](./img.png)` syntax.\n![real](./real.png)'
+    const out = rewriteLocalImageUrls(md, scope, '/repo/readme.md', ORIGIN)
+    expect(out).toContain('`![alt](./img.png)`')
+    expect(out).toContain('/sidebar/file?')
+  })
+
+  it('does not rewrite a reference definition used only by a plain link', () => {
+    // The `[manual][docs]` link references `[docs]: ./docs.md`, but that
+    // definition must NOT be redirected to /sidebar/file because it is not
+    // referenced by any image. Only image-referenced definitions are rewritten.
+    const md = '[manual][docs]\n\n![pic][pic-def]\n\n[docs]: ./docs.md\n[pic-def]: ./pic.png'
+    const out = rewriteLocalImageUrls(md, scope, '/repo/readme.md', ORIGIN)
+    expect(out).toContain('[docs]: ./docs.md')
+    expect(out).not.toMatch(/\[docs\]:.*\/sidebar\/file/)
+    // The image-referenced definition IS rewritten.
+    expect(out).toMatch(/\[pic-def\]:.*\/sidebar\/file/)
+  })
 })