Add Screen Studio-style recording area selection

[prefect12]

Summary

• add a Screen Studio-style Area source alongside screen and window capture
• support drag-to-create, move, 8-handle resize, exact pixel dimensions, Enter/double-click confirmation, and Esc cancellation
• crop capture natively with ScreenCaptureKit on macOS and WGC on Windows
• normalize cursor telemetry to the selected region so automatic zoom remains accurate

Validation

• npx tsc --noEmit
• npm test (107 files, 1000 tests)
• npx vite build --config vite.config.ts
• new region geometry tests (4 tests)
• ScreenCaptureKit helper compiled for arm64 and x86_64 macOS 14 targets

Notes

• The Windows native helper changes are source-reviewed and covered by TypeScript/config tests, but require a Windows runner for native compilation and end-to-end capture validation.
• Manual Electron UI validation was not completed locally because the Electron 43 runtime binary was not present and its download was impractically slow in this environment.

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