fix(server): strip positions from file manager targets

[davisonio]

What Changed

• Strip parsed :line[:column] positions before launching a target with the file manager.
• Add regression coverage for plain paths, line targets, and line-and-column targets on macOS.

Why

Markdown file links encode editor positions in the launch target. Command editors understand that syntax, but the file-manager path currently passes it unchanged to open, explorer, or xdg-open. The operating system then receives a nonexistent path such as /Users/tester/.claude/CLAUDE.md:4, so the click can appear to do nothing.

The normalization is in the server launcher because that is where the selected launch integration is known. It reuses the existing target parser and leaves plain paths unchanged.

This is narrower than #681, which combined suffix stripping with editor fallback behavior. It is also separate from #5366, which adds a new Open in folder action. This PR fixes the existing primary Open in editor action when File Manager is the preferred integration.

Verification

• vp test run apps/server/src/process/externalLauncher.test.ts
• vp fmt --check apps/server/src/process/externalLauncher.ts apps/server/src/process/externalLauncher.test.ts
• vp lint apps/server/src/process/externalLauncher.ts apps/server/src/process/externalLauncher.test.ts
• vp run --filter t3 typecheck

Checklist

• This PR is small and focused
• I explained what changed and why
• No UI code changed
• No animation or interaction recording is required

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