fix(frontend): don't send on Enter while an IME is composing

[haowei2000]

Change description

Pressing Enter to pick a candidate from a Chinese IME sent the message instead of selecting the word — so you got the raw pinyin posted to the channel.

Cause. While an IME is composing, the browser still fires keydown for Enter; it just marks it isComposing: true, because that keystroke belongs to the candidate popup rather than to the app. MessageComposer only checked !e.shiftKey, and nothing in the codebase looked at that flag, so "confirm this word" was read as "send".

Fix. A shared isComposing() helper in frontend/src/lib/ime.ts (nativeEvent.isComposing, plus the legacy keyCode === 229 some browsers still emit instead), guarded at every Enter-to-submit text input.

In the composer the guard sits at the top of handleKeyDown rather than on the send branch alone — the @// picker also claims Enter, Arrow, and Escape, and all of those navigate the IME popup while it's open. Guarding only the send path would have left the picker stealing candidate navigation.

The same bug existed in six other Enter-to-submit inputs, all fixed here: new channel / workspace / session dialogs, the workbench file-name input, the kanban task input, and friend lookup. Password fields are deliberately left alone — browsers disable IME there, so a guard would be dead code.

Change type

• Bug fix (fix)

Test

• Unit tests added/updated
• Local pytest passed in full
• Front-end npm run build no error reported
• When it comes to npm packages, the npm run lint / npm test / npm run build of the corresponding package has passed

Verified end-to-end against the in-cluster gateway (kind + Helm) by driving the real composer with a keydown carrying isComposing: true — exactly what the browser emits mid-composition — and A/B'd by stashing the fix:

	composing Enter	normal Enter
Before	draft cleared — sent (the bug)	sent
After	draft kept — no send	sent

The final send round-tripped through the gateway and rendered in the channel, and exactly one message was persisted despite dispatching both a composing Enter and a normal Enter — confirming the composing one was swallowed, not merely delayed.

No unit test added: isComposing() is a two-term predicate whose only real behaviour is the browser flag it reads, so a test would restate the implementation. The repo's vitest suite covers domain logic (yaml, registry) rather than helpers of this shape, and the behaviour that matters here was verified in a real browser instead.

Database migration

• Does not involve database changes

Security and Release Impact

• Does not contain .env, logs, databases, uploaded files, private keys, tokens or production configurations
• Updated documentation when it comes to configuration, deployment, permissions, file uploads, or Agent Bridge

Reviewer notes

• Pre-existing, unrelated: tsc --noEmit reports 2 errors in frontend/src/features/chat/PdfViewer.tsx from pdfjs API drift (RenderParameters.canvas, PDFDocumentProxy.destroy). Confirmed present on a clean tree, untouched by this PR, and they don't fail npm run build (vite build doesn't typecheck). Worth a separate fix.
• My local node_modules was stale and missing declared deps (yaml, @codemirror/*); npm ci resolved it. The lockfile is untouched by this PR.

Related Issues

Closes #

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