fix(app): auto-accept toggle fallback directory when no session

[johnhenry030888]

Fixes #48237.

The Settings → General auto-accept switch is greyed out with no session open because createPermissionScopeController resolves its directory only from session lineage. This adds a fallbackDirectory (session lineage first, route directory otherwise) and threads directory() from DialogSettings through SettingsGeneralV2. The switch stays disabled only when no directory is known at all.

Includes e2e coverage (remote-session-settings.spec.ts). Tested against v1.18.29.

[github-actions]

This PR doesn't fully meet our contributing guidelines and PR template.

What needs to be fixed:

• PR description is missing required template sections. Please use the PR template.

Please edit this PR description to address the above within 2 hours, or it will be automatically closed.

If you believe this was flagged incorrectly, please let a maintainer know.

[github-actions]

The following comment was made by an LLM, it may be inaccurate:

Based on my search, I found several related PRs addressing auto-accept settings functionality, but no current duplicate PRs. However, here are related PRs that address similar or adjacent concerns:

Related PRs (not duplicates, but related to auto-accept settings):

1. PR fix: honor settings auto-accept on new sessions #47104 - fix: honor settings auto-accept on new sessions

   • May share similar logic for handling auto-accept across sessions

2. PR fix(app): make auto-accept permissions app-level #47320 - fix(app): make auto-accept permissions app-level

   • Related to app-level auto-accept permission handling

3. PR fix(app): reflect global permission:allow in Settings auto-accept toggle #46226 - fix(app): reflect global permission:allow in Settings auto-accept toggle

   • Related to syncing Settings UI with global permissions state

4. PR fix(app): enable scoped auto-accept settings #43193 - fix(app): enable scoped auto-accept settings

   • Related to directory-scoped auto-accept settings

5. PR fix(app): enable directory auto-accept settings #42331 - fix(app): enable directory auto-accept settings

   • Similar directory-level auto-accept functionality

These are all historical or adjacent fixes to auto-accept functionality, but PR #48244 appears to be addressing a specific gap (fallback directory when no session is open) that isn't currently covered by an open PR.

[github-actions]

This pull request has been automatically closed because it was not updated to meet our contributing guidelines within the 2-hour window.

Feel free to open a new pull request that follows our guidelines.