feat: preview exact release runs in messages

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Summary

• recognize a bounded, versioned buzz://release-run link carrying the exact signed run result
• open a liquid-glass, artwork-led release popover beside the report on desktop and a bottom sheet on narrow/mobile layouts
• show artist, title, version, label, release date, verification source, and safe track actions
• include loading, empty, and failed states plus strict HTTPS and payload-size validation
• add the equivalent native Flutter sheet and parser

Related issue

N/A — no matching open release-run preview PR found.

Testing

• repository just ci phases completed green; the initial aggregate run exhausted local disk during native test compilation, then the native desktop suite was rerun successfully after clearing generated build artifacts
• desktop unit tests: 4,994 passed
• mobile Flutter tests: 1,467 passed
• native desktop/Tauri tests: 2,514 library tests passed, 17 environment-dependent tests ignored; auxiliary suites passed
• production desktop and web builds passed; Flutter analysis passed
• targeted Playwright release-preview coverage: 2 passed (anchored desktop popover and narrow bottom sheet)

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Screenshots