fix critical mobile ux: add close buttons and personalize identity info
- add close button (×) to detail panel, visible on all devices
- make close button larger on mobile (40px) for better touch targets
- personalize identity explanation with actual user handle and pds
- change generic text to: "your data lives at bsky.social. apps like bluesky write to and read from this server. you control @yourhandle..."
- fixes mobile bug where panel couldn't be closed
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Co-Authored-By: Claude <noreply@anthropic.com>