Use CalendarSync icon for Automations

[brsbl]

Human comments

What was wrong

Automations used a generic clock icon, which described time but not the product job of scheduling and synchronizing recurring work.

What changed

• Replaced the Automations manifest and navigation-panel icon with CalendarSync.
• Registered CalendarSyncIcon across the shared web, mobile, SF Symbol, and plugin API icon maps.
• Updated the focused sidebar story and regenerated the plugin registry artifacts.
• No routes, content, visibility rules, or navigation behavior changed.

Before

After

How you verified

• Chrome for Testing 151.0.7922.71 at 1440×900 on exact parent head c748e622e and exact PR head e44b97e27: hard-reloaded each revision, observed the settled state, and captured the matching sidebar evidence above.
• Confirmed Automations renders CalendarSync while the Plugins and Skills rows and their navigation remain unchanged, with no browser console or runtime errors.
• Remote CI passed: build, typecheck, lint, app/server/package/integration tests, Linux and macOS package smoke, and version lockstep checks.

BB-Thread-ID: thr_czdxmmyenv

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