feat(ChatPrompt): add submitOnEnter prop to control Enter behavior

[IgorShevchik]

Live sync — next commit in queue

Upstream: b597f909 — feat(ChatPrompt): add submitOnEnter prop to control Enter behavior (resolves nuxt/ui#6177)

Immediate next commit after efd7b8ec (#76) in the oldest-first queue.

What & why

Adds a submitOnEnter prop (default true) to ChatPrompt:

• true — Enter submits, Shift+Enter inserts a newline (current behavior).
• false — Enter inserts a newline, Ctrl+Enter / Cmd+Enter submits.

Applied 1:1 with upstream:

+  submitOnEnter?: boolean        // default true
+
+function handleEnter(event: KeyboardEvent) {
+  if (props.submitOnEnter) {
+    if (event.shiftKey || event.ctrlKey || event.metaKey || event.altKey) return
+  } else {
+    if (!event.ctrlKey && !event.metaKey) return
+  }
+  onEnter(event)
+}
-      @keydown.enter.exact="onEnter"
+      @keydown.enter="handleEnter"

The existing IME-guard (useIMEGuard → onEnter / onCompositionEnd) is preserved. Docs note + 3 behavioral specs added.

b24ui divergence: none functional — only the slots-type prop stays b24ui (vs upstream ui), which is the pre-existing library-wide rename. Not a breaking change (new optional prop, default keeps old behavior).

Ledger (per-port maintenance, #75 §1)

• .sync/nuxt-ui.json: cursor → b597f909; previous efd7b8ec entry finalized (pr: 76, b24ui_sha: d9debe3e) — the rolling-correction pattern.
• .sync/log/b597f909….md: decision record.

Validation (linux verify script; windows .ps1 below in chat)

• ✅ dev:prepare · ✅ eslint · ✅ typecheck
• ✅ ChatPrompt spec 38 passed (+3) · ✅ full pnpm exec vitest run (no -u) 4892 passed | 6 skipped

https://claude.ai/code/session_01Qz7EXMncvEGiCj4WbmYgJo

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