fix(sqlite,browser): resolve SQLite connection pool deadlock, disable stale SW cache, and update BRAIN.md

frontend/src/features/capture/InstantCaptureBar.tsx

@@ -148,40 +148,46 @@ export const InstantCaptureBar: React.FC<InstantCaptureBarProps> = ({
     const effectiveTarget = overrideTarget || target;
     const effectiveListId =
       overrideListId || targetListId || (lists.length > 0 ? lists[0].id : '');
+    const capturedPriority = priority;
+    const capturedDueDate = dueDate;
+    const capturedSource = isListening ? 'voice' : 'manual';
 
+    // Optimistically clear input immediately so the UI feels instant (<10ms) in all browsers
+    setContent('');
+    setPriority('normal');
+    setDueDate('');
+    setTarget('inbox');
+    setShowOptions(false);
     setIsSubmitting(true);
     triggerHaptic(15);
 
+    const savedMsg =
+      effectiveTarget === 'task'
+        ? 'Als Aufgabe!'
+        : effectiveTarget === 'list_item'
+        ? 'Auf Liste!'
+        : effectiveTarget === 'document'
+        ? 'Als Notiz!'
+        : 'Im Dump!';
+    setJustSavedLabel(savedMsg);
+    setTimeout(() => setJustSavedLabel(null), 1600);
+    inputRef.current?.focus();
+
     try {
       const created = await api.captureThought(
         trimmed,
-        priority,
-        isListening ? 'voice' : 'manual',
-        dueDate,
+        capturedPriority,
+        capturedSource,
+        capturedDueDate,
         {
           target: effectiveTarget,
           targetListId: effectiveTarget === 'list_item' ? effectiveListId : '',
         }
       );
-      setContent('');
-      setPriority('normal');
-      setDueDate('');
-      setTarget('inbox');
-      setShowOptions(false);
-
-      const savedMsg =
-        effectiveTarget === 'task'
-          ? 'Als Aufgabe!'
-          : effectiveTarget === 'list_item'
-          ? 'Auf Liste!'
-          : effectiveTarget === 'document'
-          ? 'Als Notiz!'
-          : 'Im Dump!';
-      setJustSavedLabel(savedMsg);
-      setTimeout(() => setJustSavedLabel(null), 1600);
-
       onCaptured(created, effectiveTarget);
-      inputRef.current?.focus();
+    } catch {
+      // Restore text if capture unexpectedly failed completely
+      setContent(trimmed);
     } finally {
       setIsSubmitting(false);
     }
@@ -221,6 +227,12 @@ export const InstantCaptureBar: React.FC<InstantCaptureBarProps> = ({
             type="text"
             value={content}
             onChange={(e) => setContent(e.target.value)}
+            onKeyDown={(e) => {
+              if (e.key === 'Enter' && !e.shiftKey) {
+                e.preventDefault();
+                executeCapture();
+              }
+            }}
             placeholder={
               isListening
                 ? 'Ich höre zu…'