feat: hostname-aware window title

[aakhter]

Summary

Set the browser tab title to codeman:${hostname} instead of the bare Codeman literal.
Useful for users running multiple Codeman instances across hosts (laptop, dev box, NAS) —
the OS hostname disambiguates which tab points at which backend, so you don't end up
typing into the wrong session.

Example:

Before	After
Codeman	codeman:laptop-aakhter
Codeman	codeman:nas02

Implementation

• src/cli.ts — new --title-hostname <hostname> flag overrides the detected hostname (handy when os.hostname() returns something noisy, or when you just want a cosmetic name).
• src/web/server.ts — WebServer now accepts an optional titleHostname constructor arg (defaults to os.hostname()), composes windowTitle = codeman:${titleHostname}, and serves / and /index.html by templating that title into the cached index.html template. The <title> substitution is HTML-escaped via a small escapeHtmlText() helper so a hostname like <script> can't break out.
• src/web/public/notification-manager.js — title-flash logic now uses this.originalTitle instead of the hardcoded Codeman literal, so the tab flash respects the per-host title.
• scripts/browser-comparison.mjs + test/file-link-click.test.ts — expectations updated from === 'Codeman' to a startsWith('codeman:') predicate so they pass regardless of host.

The index.html templating is intentionally narrow — it only substitutes the <title> tag and continues to serve everything else from the static template. No JS-side title injection, so the correct title shows from the very first paint and works without JavaScript.

Test plan

• npm run build && node dist/cli.js web -p 3000 — open in browser, tab title shows codeman:<your-hostname>.
• Same with --title-hostname custom-name — tab title shows codeman:custom-name.
• Trigger an idle/notification flash (background the tab while a session emits an event) — verify the flashing title alternates between (N) codeman:<hostname> and codeman:<hostname>, not the old Codeman literal.
• HTML escape: --title-hostname '<script>' → page title in the rendered HTML shows codeman:<script>, no DOM injection.

Note on the test file diff size

test/file-link-click.test.ts shows ~49 prettier-reformat lines that aren't part of the feature — they're pre-existing prettier debt the local pre-commit hook required me to clear. The only behavioral change in that file is the browserAvailable = ...startsWith('codeman:') line.

🤖 Generated with Claude Code

[Ark0N]

Thanks — this is genuinely useful for me too (I bounce between several Codeman hosts). The implementation is exactly the right shape: server-side HTML templating so the correct title paints on first byte (no JS-side flicker), narrow HTML-escape scoped to title element content, and the notification-manager change so the flashing title also respects the per-host name. --title-hostname override is a nice escape hatch for noisy os.hostname() outputs.