fix(profile): stable headless-shell profile directory for cookie persistence

[shaun0927]

Summary

Fixes issue #606 Root Cause A: when --headless-shell is used, profile-manager.ts was creating a new ephemeral temp directory (openchrome-<Date.now()>) on every launch, destroying all cookies between restarts.

Root Cause (A)

resolveProfile() previously handled useTempProfile and usingHeadlessShell in a single branch, giving both an ephemeral os.tmpdir()/openchrome-<Date.now()> path. Since Date.now() changes every launch, headless-shell sessions had no persistent storage for cookies, auth tokens, or session state.

Fix

• Split the combined branch into two separate cases in resolveProfile()
• useTempProfile continues to use an ephemeral os.tmpdir()/openchrome-<Date.now()> path (intentional)
• usingHeadlessShell now uses a stable path: ~/.openchrome/headless-shell-profile via os.homedir() (Windows-compatible)
• Added a new 'headless-shell' value to ProfileType to make the distinction explicit
• Added a matching log message in launcher.ts for the new profile type
• Updated the test that previously expected profileType === 'temp' for headless-shell to now expect profileType === 'headless-shell' and verify the stable path

Test plan

• tests/chrome/persistent-profile.test.ts — all 47 tests pass, including updated headless-shell test
• tests/chrome/launcher-launch.test.ts — all 9 tests pass
• Build: npm run build exits cleanly (zero TypeScript errors)

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