* M3: add cursor zoom and temporary mouse-button navigation on Windows
Anchor Ctrl-wheel zoom to the cursor; share bounded, immediate ScrollArea pan between the middle button and Space + primary drag. Preserve ordinary scrolling and editing, cancel capture on focus/document changes, and initialize numeric zoom before the viewport exists.
Validation on Windows x64: formatting, application check and workspace Clippy pass; full workspace tests pass (928 passed, 4 ignored), including 53 UI unit tests and 27 control integration tests. No branding changes, new dependencies, machine-specific build configuration or local development notes.
* M3: add contributor display name for mhadidi06
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Co-authored-by: Brandon Thomas <echelon@gmail.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
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