Mirror Ghostty-style terminal titles

[ben-million]

Summary

• Add foreground process detection so active commands update the terminal/page title.
• Fall back to Ghostty-style cwd titles when the shell is idle, including home abbreviation and deep-path truncation.
• Cover process selection and cwd title formatting with focused server tests.

Test plan

• pnpm --filter localterm-server test -- foreground-process-title working-directory-title
• pnpm build
• Manual smoke test: idle cwd title -> running command title -> cwd title after command/cd

Made with Cursor

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Note

Medium Risk
Adds periodic ps-based process inspection and cwd resolution to drive session titles, which can impact performance/portability and introduces timer lifecycle/concurrency concerns in the session runtime.

Overview
Updates session title behavior to automatically reflect what’s running: sessions now poll for the PTY’s foreground process and set the title to that command name when available.

When no foreground job is detected, the title falls back to a Ghostty-style working-directory display (home abbreviation and deep-path truncation). This introduces new process/title utilities (foreground-process-title.ts, working-directory-title.ts), new tuning constants, and focused Vitest coverage for process selection and cwd-title formatting.

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