feat(lsp): resolve tsserver path from main repo in git worktrees

[cast-vytautas]

Linked issue

Closes #917

What does this PR do?

When running kimchi in a git worktree that has no node_modules, the typescript-language-server could not resolve tsserver.js and failed to provide TypeScript intelligence.

This PR resolves tsserver.js from the main repository root when the cwd is a git worktree:

• src/extensions/lsp/servers.ts — adds findMainRepoRoot(cwd) which detects a git worktree by reading <cwd>/.git (a file in worktrees, a directory in normal repos), parsing the gitdir: line, and extracting the main repo root. Adds resolveTsserverPath(cwd) which checks the local node_modules/typescript/lib/tsserver.js first, then falls back to the main repo root copy if cwd is a worktree.
• src/extensions/lsp/client.ts — wires resolveTsserverPath into getOrCreateClient: when config.command === "typescript-language-server", it sets initOptions.tsserver.path to the resolved path before the LSP initialize request. Existing initOptions are preserved.
• src/extensions/lsp/servers.test.ts — new test file covering findMainRepoRoot (5 cases: valid worktree, .git is a directory, no .git, no gitdir pattern, non-worktrees gitdir) and resolveTsserverPath (5 cases: local tsserver, main repo fallback, not-a-worktree, .git directory, local preference).

Local preference is preserved: if node_modules/typescript exists in the worktree itself, it is used over the main repo copy.

Checklist

• I have read CONTRIBUTING.md and agree to the CLA
• This PR links to an open issue above
• Tests pass locally (pnpm run test)
• Lint passes (pnpm run check)
• Documentation updated if behavior changed

[readme-ai-writer]

📚 No documentation changes were needed for this PR.

[kimchi-review]

Kimchi Code Review

Property	Value
Commit	f768d02
Author	@cast-vytautas
Files changed	0
Review status	Completed
Comments	2 (1 info, 1 warning)
Duration	61s

Summary

📊 Review Score: 87/100 (overall code quality — 0 lowest, 100 highest)
⏱️ Estimated effort to review: 2/5 (1 = trivial, 5 = very complex)

🧪 Tests: yes — New unit tests in src/extensions/lsp/servers.test.ts cover findMainRepoRoot and resolveTsserverPath comprehensively, including local preference, worktree fallback, missing TypeScript, non-worktree repos, and submodule exclusion.

📝 Found 2 issue(s). See inline comments for details.

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[kimchi-review]

📊 Review Score: 87/100 (overall code quality — 0 lowest, 100 highest)
⏱️ Estimated effort to review: 2/5 (1 = trivial, 5 = very complex)

🧪 Tests: yes — New unit tests in src/extensions/lsp/servers.test.ts cover findMainRepoRoot and resolveTsserverPath comprehensively, including local preference, worktree fallback, missing TypeScript, non-worktree repos, and submodule exclusion.

📝 Found 2 issue(s). See inline comments for details.

[github-actions]

This PR has been marked as stale because it has not had recent activity. It will be closed tomorrow if no further activity occurs.