feat(views): always-visible ⌘↵ hint on send buttons (MUL-2713)

Surface the Cmd/Ctrl+Enter shortcut as a visible <kbd> next to the
chat and comment send buttons. The tooltip-only hint required hover
discovery, so users pressing bare Enter never learned why nothing
was sent.

Co-authored-by: multica-agent <github@multica.ai>

packages/views/chat/components/chat-input.tsx

@@ -304,6 +304,14 @@ export function ChatInput({
               onSelect={(file) => editorRef.current?.uploadFile(file)}
             />
           )}
+          {!isRunning && (
+            <kbd
+              aria-hidden
+              className="hidden sm:inline-flex h-4 items-center gap-0.5 rounded border border-border/50 bg-background/30 px-1 font-mono text-[10px] leading-none text-muted-foreground select-none"
+            >
+              {formatShortcut(modKey, enterKey)}
+            </kbd>
+          )}
           <SubmitButton
             onClick={handleSend}
             disabled={isEmpty || isSubmitting || !!disabled || !!noAgent || pendingUploads > 0}

packages/views/issues/components/comment-input.tsx

@@ -163,6 +163,12 @@ function CommentInput({ issueId, onSubmit }: CommentInputProps) {
           multiple
           onSelect={(file) => editorRef.current?.uploadFile(file)}
         />
+        <kbd
+          aria-hidden
+          className="hidden sm:inline-flex h-4 items-center gap-0.5 rounded border border-border/50 bg-background/30 px-1 font-mono text-[10px] leading-none text-muted-foreground select-none"
+        >
+          {formatShortcut(modKey, enterKey)}
+        </kbd>
         <SubmitButton
           onClick={handleSubmit}
           disabled={isEmpty}