Preserve native keypad identity in terminal input

[cristicretu]

Behavior

Physical numeric-keypad keys now reach the terminal's shared key encoder, including DEC application-keypad sequences. Keypad Enter stays distinct from Return; top-row digits stay ordinary characters.

The existing pinned gpui_macos patch exposes read-only hardware metadata only during the matching synchronous callback. Nested callbacks and unwinding restore the previous context. Logical GPUI text, IME fields and shortcut identity remain unchanged. The app adds a direct edge to the already-present pinned platform crate; no new package, event monitor, timer or encoder is introduced.

Stacked on #336. Legacy key releases and modified application-keypad chords retain that PR's explicit unsupported behavior.

Validation

• 1,676 workspace tests passed; 36 ignored. All 15 vendored platform tests passed.
• Formatting, strict workspace Clippy and release build passed.
• Synthetic AppKit events verify physical keypad/top-row/Return identities. Tests cover nested duplicate logical keys, unwind/thread cleanup, exact terminal bytes, ordinary query-field insertion and Command shortcut identity.
• A first broad run exposed the existing login-path late-success/deadline race. Its exact rerun and the final full suite passed; a separate deterministic deadline correction is being prepared.

Test evidence

Rendered results from real synthetic AppKit events and shared-encoder assertions. No OS input was posted and this is test evidence, not a GUI mockup.

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