Add configurable composer submit shortcut.

[brianacdev]

What Changed

Adds a client setting for composer submit shortcut:

• Enter
• Shift+Enter
• Cmd/Meta+Enter
• Alt/Option+Enter
• Ctrl+Enter
• Button only

Default remains Enter (Unchanged).

Why

Avoids accidental prompt sends and supports users with different editor/chat muscle memory.

UI Changes

Before:

After:

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes (N/A)

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Note

Medium Risk
Changes the chat composer Enter-key submit behavior based on a new client setting, which can affect message sending UX and potentially cause unexpected submits/line breaks if misconfigured. Scope is limited and covered by unit tests plus schema defaults, keeping overall risk moderate.

Overview
Adds a new client setting, composerSubmitKeybinding, to control which Enter modifier combination submits the chat composer (including a button-only mode).

Wires the setting end-to-end: updates contracts schemas/defaults and client settings patching, adds a General settings UI selector with reset/restore-default support, and switches ChatComposer to use shared shouldSubmitComposerOnEnter key-handling logic (with new unit tests and updated persistence tests).

^{Reviewed by Cursor Bugbot for commit 8607f09. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Add configurable composer submit shortcut to General settings

• Adds a composerSubmitKeybinding field to ClientSettingsSchema (defaulting to "enter") with support for enter, shiftEnter, metaEnter, altEnter, ctrlEnter, and buttonOnly.
• Adds a 'Composer submit' dropdown in General settings so users can change or reset the shortcut.
• Replaces the hardcoded Enter && !shiftKey check in ChatComposer with shouldSubmitComposerOnEnter, a new utility in composer-logic.ts that matches the event modifiers against the configured keybinding.
• Behavioral Change: existing users whose stored settings lack composerSubmitKeybinding will decode to "enter" (same as before), but users who switch to shiftEnter will no longer submit on bare Enter.

^{Macroscope summarized 8607f09.}

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[macroscopeapp]

Approvability

Verdict: Approved

This PR adds a user-configurable keyboard shortcut setting for composer submission with comprehensive tests. The default behavior is preserved, changes are self-contained to settings and input handling, and no sensitive code paths are affected.

^{You can customize Macroscope's approvability policy. Learn more.}

[GuilhermeVieiraDev]

Wouldn't it make more sense to be on the Keybindings setting page?