Profile screen now reads initial values from cache so navigating back
shows data instantly instead of re-fetching everything from scratch.
- Seed displayName/about/picture from User.metadataOrNull() on compose
- Add followerCounts/followingCounts maps to DesktopLocalCache
- Write counts on each update, read on profile open
- Follower count still ticks up live (good UX) but starts from cached value
- 4 new tests for profile count caching + metadata cache reads
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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