Simplify git pull flow and add subtle stitched 3D border

[BunsDev]

Summary

• Simplified the server git sync path to a fast-forward-only pullCurrentBranch flow and updated websocket callers accordingly.
• Removed diverged-branch rebase/conflict handling from pull UI and replaced it with a disabled sync hint that tells users to rebase or merge first.
• Cleaned up several menu and settings paths while removing legacy background-image settings migration code.
• Refined the decorative stitch border into a subtler 3D seam treatment with depth shadowing and adjusted spacing/animation.

Testing

• Not run (not requested).
• Existing tests were updated for the renamed git pull API and the simplified sync-state behavior.
• UI-related test snapshots and logic coverage were adjusted for the menu and settings refactors.

[vercel]

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