feat(ai): add enterToSubmit prop to ChatComposer

[b-client-vm]

Summary

• Adds an optional enterToSubmit prop (default true) to <ChatComposer> in @spacedrive/ai.
• When true: Enter sends, Shift+Enter inserts a newline (current behavior — backward compatible).
• When false: Enter inserts a newline; ⌘/Ctrl/Alt+Enter sends.
• Also guards the keydown handler against IME composition events (event.nativeEvent.isComposing) so dead-keys / CJK composition no longer accidentally submit.

Motivation

Some users frequently send multi-line messages and want Enter to insert newlines, with a modifier+Enter to send. Exposing this as a prop lets consumers (spacebot, etc.) wire it to a user preference.

Companion PR

Consumed by spacedriveapp/spacebot#600 (closes spacedriveapp/spacebot#599).
This PR must merge and a new @spacedrive/ai release be published before that one can land.

Test plan

• No prop passed → existing behavior unchanged (Enter sends, Shift+Enter newline)
• enterToSubmit={false} → Enter inserts newline, ⌘/Ctrl/Alt+Enter sends
• IME composition (e.g. typing Japanese/Chinese) — pressing Enter to commit a candidate no longer submits

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 89029467-6046-43db-97be-115c8e24f5db

📥 Commits

Reviewing files that changed from the base of the PR and between 2e91fbf and 17392f6.

📒 Files selected for processing (1)

• packages/ai/src/ChatComposer.tsx

Walkthrough

The ChatComposer component now accepts an enterToSubmit prop that controls Enter key behavior. When true (default), Enter submits and Shift+Enter inserts a newline. When false, Enter inserts a newline unless a modifier key is held, then submits. The textarea handler was refactored to use a dedicated handleKeyDown function.

Changes

Enter Key Submission Control

Layer / File(s)	Summary
Enter key submission behavior packages/ai/src/ChatComposer.tsx	KeyboardEvent type is imported, ChatComposerProps interface gains the optional enterToSubmit boolean prop with documentation, handleKeyDown function encapsulates conditional Enter key logic with support for both submit-on-Enter and submit-on-modifier modes, and textarea onKeyDown is wired to the new handler function.

🎯 2 (Simple) | ⏱️ ~8 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately and concisely describes the main change: adding an enterToSubmit prop to ChatComposer.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description check	✅ Passed	The pull request description clearly explains the changes: adding an enterToSubmit prop to control Enter key behavior, with detailed motivation, companion PR context, and a comprehensive test plan.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@packages/ai/src/ChatComposer.tsx`:
- Around line 74-85: In handleKeyDown, avoid calling onSend when sending is
disabled by respecting the existing canSend guard (so keyboard behavior matches
the Send button); before calling onSend() (both in the enterToSubmit branch and
the modifier-keys branch) check if canSend is true (or compute same guard:
!isSending && draft.trim().length > 0) and return early if not, and only call
event.preventDefault() when you will actually invoke onSend; locate
handleKeyDown and apply the guard there.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 3233877e-567a-48e6-b223-1d2b977b7feb

📥 Commits

Reviewing files that changed from the base of the PR and between a48b170 and 2e91fbf.

📒 Files selected for processing (1)

• packages/ai/src/ChatComposer.tsx