Main coves client

feat(auth): add Bluesky sign-in button to landing screen master

Introduce branded Bluesky authentication option with official butterfly logo and Coves-consistent styling. The outline button matches the design system while maintaining Bluesky brand identity. Changes: - Add BlueskySignInButton widget with press animations and disabled state - Add official Bluesky butterfly SVG asset - Add linkBlueLight color constant for interactive states - Integrate sign-in button on landing screen (routes to /login) - Add Sentry error tracking for SVG asset loading failures - Add Claude Code merge-to-main command Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>


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