fix(mobile): send on Ctrl/Cmd+Enter from a hardware keyboard on Android

[sideeffffect]

Problem

On the Android app, there is no way to send a message from a hardware (e.g. Bluetooth) keyboard. Plain Enter inserts a newline — correct for touch — but no modifier shortcut was wired, so tablet/phone users with a keyboard attached are stuck reaching for the on-screen Send button.

iOS already handles this: the Swift view registers a Cmd+Enter key command and emits an onComposerSubmit event, which T3ComposerEditor.ios.tsx forwards to the composer's onSubmit. The Android side never implemented onComposerSubmit — not in the native module, not in the view, and not in the T3ComposerEditor.native.tsx bridge.

Fix

Wire the same onComposerSubmit path on Android, mirroring iOS:

• T3ComposerEditorModule.kt — declare the onComposerSubmit event.
• T3ComposerEditorView.kt — the native EditText now detects Ctrl/Meta+Enter in onKeyDown and emits onComposerSubmit; plain Enter falls through to the default multiline newline insertion.
• T3ComposerEditor.native.tsx — declare and forward onComposerSubmit to the composer's onSubmit, exactly as the iOS variant already does.

Ctrl+Enter is the Android convention (matching iOS's Cmd+Enter); Meta is accepted too for external keyboards that map a Command/Meta key.

Surfaces

• Android: fixed here.
• iOS: already worked; unchanged.
• Web: mobile-web has the same gap (plain Enter never submits on a mobile viewport, no modifier fallback) — that lives in a completely separate code path (composer-logic.ts) and is out of scope for this PR to keep it to one concern.

Testing

• vp run typecheck (mobile) — pass.
• vp run lint:mobile (ktlint 1.8.0 + detekt against detekt.yml --build-upon-default-config) — pass.
• Native Android build is not part of PR CI, so the Kotlin was verified against ktlint/detekt locally.

I don't have a device set up to capture a hardware-keyboard video; happy to add one if a maintainer can point me at the mobile e2e harness.

Done by Claude Opus 4.8 via Claude Code.

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Note

Low Risk
Localized Android composer keyboard handling with no auth, data, or shared business-logic changes; behavior aligns with existing iOS submit path.

Overview
Android composer now matches iOS for keyboard send: hardware Ctrl/Meta+Enter triggers submit; plain Enter still inserts a newline in the multiline editor.

The Expo module declares onComposerSubmit, the native EditText handles the shortcut in onKeyDown, and T3ComposerEditor.native.tsx forwards it to the composer's onSubmit prop (same wiring as the iOS bridge).

^{Reviewed by Cursor Bugbot for commit 094a8d2. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Send submit event on Ctrl/Cmd+Enter from hardware keyboard on Android composer

• Adds a submitListener callback to SelectionAwareEditText that fires on Ctrl+Enter or Meta+Enter, consuming the key event so plain Enter still inserts a newline.
• Wires the callback through T3ComposerEditorView to dispatch an onComposerSubmit event, exported by T3ComposerEditorModule.
• Forwards a new onSubmit prop from the ComposerEditor React component to the native view as onComposerSubmit.
• Risk: onKeyDown override in SelectionAwareEditText consumes Ctrl/Meta+Enter before default handling; verify no other key handlers depend on receiving that event.

^{Macroscope summarized 094a8d2.}

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[macroscopeapp]

Approvability

Verdict: Approved at 094a8d2

Macroscope's review found this PR approvable — This is a small Android-only parity fix that connects Ctrl/Meta+Enter to the existing send handler while preserving plain Enter newline behavior. It is isolated to native keyboard handling and event wiring, with no schema, security, billing, deployment, or shared-infrastructure impact.

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