fix: restore recorded cursor behavior in both editors

[richiemcilroy]

Selecting macOS, macOS Tahoe, or Windows turned recorded cursors with missing shape metadata into arrows. Restore their captured image fallback and add a separate Default option in both the regular and GPUI editors, with descriptions explaining each appearance.

Recognize the newer Tahoe pointing/open/closed hand cursors when recording and recover their SVG assets from existing recordings using exact decoded-pixel fingerprints. Custom images remain intact, and saved recordings need no migration.

Validation: both renderer and GPUI compile checks, desktop TypeScript and Biome, 10 cursor-info tests, 274 renderer tests (5 existing ignored), 2 picker tests, 3 GPUI selection tests in an isolated source harness, Metal cursor-edge regression, and scoped Clippy passed. The actual Solid picker also bundles successfully. Native cursor fingerprints were checked on macOS; installed-editor visual testing and Windows/Linux runtime testing remain outstanding. Browser preview of the isolated local file was blocked by the browser URL policy.

Confidence Score: 5/5

The PR appears safe to merge, with the two editors aligned and recorded/custom cursor fallback preserved through the shared renderer.

Summary

• Preserves custom and metadata-less recorded cursor images instead of replacing them with platform arrows.
• Recognizes current Tahoe hand cursors and recovers scalable assets for three known legacy pixel fingerprints.
• Adds aligned Default selection, ordering, descriptions, and compatibility handling for legacy Pointer projects across the Solid and GPUI editors.
• Adds focused tests for selection behavior, family mapping, and recovered cursor assets.

_{Reviews (1) · Last reviewed commit: "fix: restore recorded cursor behavior in..."}

[richiemcilroy]

hey @greptileai, please re-review the PR