v3.6.0: The action pages become settings

[thorstenalpers]

New: Settings → Pages lists the page every action runs on — X posts, replies, reposts, likes and following, YouTube comments and likes — and lets the user change any of them. The extension gets the same fields in its popup.

• Only overrides are stored (siteUrls, keyed platform.group); an absent key means the built-in page. {user} stands for the signed-in handle.
• The Rust host resolves overrides in resolve_target_url for both show and delete; blank overrides read as "not set". The extension resolves the same keys from its popup settings in background.ts.
• Clearing a field returns it to the built-in page; a "Reset pages" button drops every override at once.
• The assistant's troubleshooting notes and .agents/docs/09-feature-settings.md describe the new card.
• The point: when a platform moves a page again — the way X just moved reposts (Deleting reposts currently does nothing #64) — the fix is a settings field, not a wait for the next release.
• Versions: app 3.6.0, extension 1.1.0. Release notes in release-notes/v3.6.0.md.

Verified locally in the app: an override redirects show/delete to the configured page, clearing it restores the default, reset clears all. The extension build compiles; its popup fields follow the same code path.

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