Merge branch 'feature/search-emoji-demo' into dev

Gemini: full emoji picker (desktop + mobile bottom sheet), global search
with SQLite FTS5 and Cmd+K palette (access-checked), demo mode resets the
database on every start.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

frontend/src/components/CommandPalette.tsx

@@ -0,0 +1,327 @@
+import React, { useEffect, useMemo, useRef, useState } from 'react';
+import {
+  Search,
+  FileText,
+  CheckSquare,
+  ShoppingCart,
+  X,
+  Loader2,
+  ArrowRight,
+  CornerDownLeft,
+} from 'lucide-react';
+import { SearchHit } from '../lib/types';
+import { api } from '../lib/api';
+
+interface CommandPaletteProps {
+  isOpen: boolean;
+  onClose: () => void;
+  onOpenDocument: (docId: string, blockId?: string) => void;
+  onOpenTask: (taskId: string) => void;
+  onOpenList: (listId: string) => void;
+}
+
+// Safely render snippet containing <mark>...</mark> without dangerouslySetInnerHTML
+const SnippetRenderer: React.FC<{ snippet: string }> = ({ snippet }) => {
+  const parts = useMemo(() => {
+    if (!snippet) return [];
+    return snippet.split(/(<mark>[\s\S]*?<\/mark>)/g);
+  }, [snippet]);
+
+  return (
+    <span className="text-muted text-xs line-clamp-2 leading-relaxed">
+      {parts.map((part, i) => {
+        if (part.startsWith('<mark>') && part.endsWith('</mark>')) {
+          const text = part.slice(6, -7);
+          return (
+            <mark
+              key={i}
+              className="bg-accent/25 text-accent font-semibold px-0.5 rounded"
+            >
+              {text}
+            </mark>
+          );
+        }
+        return <span key={i}>{part}</span>;
+      })}
+    </span>
+  );
+};
+
+export const CommandPalette: React.FC<CommandPaletteProps> = ({
+  isOpen,
+  onClose,
+  onOpenDocument,
+  onOpenTask,
+  onOpenList,
+}) => {
+  const [query, setQuery] = useState('');
+  const [hits, setHits] = useState<SearchHit[]>([]);
+  const [selectedIndex, setSelectedIndex] = useState(0);
+  const [loading, setLoading] = useState(false);
+
+  const inputRef = useRef<HTMLInputElement>(null);
+  const debounceTimerRef = useRef<number | null>(null);
+
+  // Group hits by category: Notizen, Aufgaben, Listen
+  const groupedHits = useMemo(() => {
+    const docs: SearchHit[] = [];
+    const tasks: SearchHit[] = [];
+    const lists: SearchHit[] = [];
+
+    for (const h of hits) {
+      if (h.type === 'document') {
+        docs.push(h);
+      } else if (h.type === 'thought') {
+        tasks.push(h);
+      } else if (h.type === 'list_item') {
+        lists.push(h);
+      }
+    }
+
+    return [
+      { key: 'documents', label: 'Notizen', icon: FileText, items: docs },
+      { key: 'tasks', label: 'Aufgaben', icon: CheckSquare, items: tasks },
+      { key: 'lists', label: 'Listen', icon: ShoppingCart, items: lists },
+    ].filter((g) => g.items.length > 0);
+  }, [hits]);
+
+  // Flattened array for simple up/down index navigation
+  const flatHits = useMemo(() => {
+    return groupedHits.flatMap((g) => g.items);
+  }, [groupedHits]);
+
+  // Focus input and reset on open
+  useEffect(() => {
+    if (isOpen) {
+      setQuery('');
+      setHits([]);
+      setSelectedIndex(0);
+      setTimeout(() => inputRef.current?.focus(), 50);
+    }
+  }, [isOpen]);
+
+  // 150ms debounce search
+  useEffect(() => {
+    if (debounceTimerRef.current !== null) {
+      window.clearTimeout(debounceTimerRef.current);
+    }
+
+    const trimmed = query.trim();
+    if (!trimmed) {
+      setHits([]);
+      setLoading(false);
+      setSelectedIndex(0);
+      return;
+    }
+
+    setLoading(true);
+    debounceTimerRef.current = window.setTimeout(async () => {
+      try {
+        const res = await api.searchAll(trimmed);
+        setHits(res.hits || []);
+        setSelectedIndex(0);
+      } catch {
+        setHits([]);
+      } finally {
+        setLoading(false);
+      }
+    }, 150);
+
+    return () => {
+      if (debounceTimerRef.current !== null) {
+        window.clearTimeout(debounceTimerRef.current);
+      }
+    };
+  }, [query]);
+
+  // Keyboard navigation: ↑, ↓, Enter, Escape
+  useEffect(() => {
+    if (!isOpen) return;
+
+    const handleKeyDown = (e: KeyboardEvent) => {
+      if (e.key === 'Escape') {
+        e.preventDefault();
+        onClose();
+        return;
+      }
+
+      if (flatHits.length === 0) return;
+
+      if (e.key === 'ArrowDown') {
+        e.preventDefault();
+        setSelectedIndex((prev) => (prev + 1) % flatHits.length);
+      } else if (e.key === 'ArrowUp') {
+        e.preventDefault();
+        setSelectedIndex((prev) => (prev - 1 + flatHits.length) % flatHits.length);
+      } else if (e.key === 'Enter') {
+        e.preventDefault();
+        const selected = flatHits[selectedIndex];
+        if (selected) {
+          executeSelection(selected);
+        }
+      }
+    };
+
+    window.addEventListener('keydown', handleKeyDown);
+    return () => window.removeEventListener('keydown', handleKeyDown);
+  }, [isOpen, flatHits, selectedIndex]);
+
+  const executeSelection = (hit: SearchHit) => {
+    onClose();
+    if (hit.type === 'document') {
+      onOpenDocument(hit.docId || hit.id, hit.blockId);
+    } else if (hit.type === 'thought') {
+      onOpenTask(hit.id);
+    } else if (hit.type === 'list_item') {
+      if (hit.listId) {
+        onOpenList(hit.listId);
+      }
+    }
+  };
+
+  if (!isOpen) return null;
+
+  return (
+    <div
+      className="fixed inset-0 z-50 flex items-start justify-center p-0 sm:p-4 sm:pt-16 bg-black/60 backdrop-blur-xs animate-in fade-in duration-150"
+      onClick={onClose}
+    >
+      {/* Search Modal Container */}
+      <div
+        className="
+          w-full h-full bg-panel flex flex-col overflow-hidden shadow-2xl
+          sm:h-auto sm:max-h-[80vh] sm:max-w-2xl sm:rounded-card sm:border sm:border-border
+        "
+        onClick={(e) => e.stopPropagation()}
+      >
+        {/* Top Input Bar */}
+        <div className="flex items-center gap-2.5 px-4 py-3 border-b border-border bg-canvas/40 shrink-0">
+          <Search className="w-5 h-5 text-accent shrink-0" />
+          <input
+            ref={inputRef}
+            type="text"
+            value={query}
+            onChange={(e) => setQuery(e.target.value)}
+            placeholder="Globale Suche in Notizen, Aufgaben und Listen…"
+            className="flex-1 bg-transparent border-0 outline-none text-main placeholder-muted text-base sm:text-sm focus:ring-0 p-0"
+          />
+          {loading && <Loader2 className="w-4 h-4 animate-spin text-accent shrink-0" />}
+          {query && !loading && (
+            <button
+              type="button"
+              onClick={() => {
+                setQuery('');
+                setHits([]);
+                inputRef.current?.focus();
+              }}
+              className="text-muted hover:text-main p-1"
+              title="Eingabe leeren"
+            >
+              <X className="w-4 h-4" />
+            </button>
+          )}
+          <button
+            type="button"
+            onClick={onClose}
+            className="sm:hidden px-2 py-1 text-xs font-semibold text-accent"
+          >
+            Fertig
+          </button>
+        </div>
+
+        {/* Results Container */}
+        <div className="flex-1 overflow-y-auto p-2 space-y-4 min-h-[160px]">
+          {query.trim() === '' ? (
+            <div className="py-12 px-4 text-center text-xs text-muted space-y-1">
+              <p className="font-semibold text-main">MindSift Globale Suche</p>
+              <p>Tippe ein Stichwort ein, um alle Inhalte in Sekundenschnelle zu durchsuchen.</p>
+            </div>
+          ) : flatHits.length === 0 && !loading ? (
+            <div className="py-12 px-4 text-center text-xs text-muted space-y-1">
+              <p className="font-semibold text-main">Keine Treffer gefunden</p>
+              <p>Keine Notizen, Aufgaben oder Listen-Einträge stimmen mit „{query}“ überein.</p>
+            </div>
+          ) : (
+            groupedHits.map((group) => {
+              const GroupIcon = group.icon;
+              return (
+                <div key={group.key} className="space-y-1">
+                  <div className="flex items-center gap-1.5 px-2 py-1 text-[11px] font-bold text-accent uppercase tracking-wider">
+                    <GroupIcon className="w-3.5 h-3.5" />
+                    <span>{group.label}</span>
+                  </div>
+
+                  <div className="space-y-1">
+                    {group.items.map((item) => {
+                      const overallIndex = flatHits.indexOf(item);
+                      const isSelected = overallIndex === selectedIndex;
+                      return (
+                        <div
+                          key={item.id}
+                          onClick={() => executeSelection(item)}
+                          onMouseEnter={() => setSelectedIndex(overallIndex)}
+                          className={`
+                            px-3 py-2.5 rounded-btn flex items-start gap-2.5 transition-colors cursor-pointer border
+                            ${
+                              isSelected
+                                ? 'bg-panel-elevated border-accent text-main'
+                                : 'bg-canvas/50 border-transparent text-main hover:bg-panel-elevated'
+                            }
+                          `}
+                        >
+                          <div className="mt-0.5 shrink-0 text-base leading-none">
+                            {item.icon || (item.type === 'document' ? '📝' : item.type === 'thought' ? '✅' : '🛒')}
+                          </div>
+
+                          <div className="flex-1 min-w-0 space-y-0.5">
+                            <div className="flex items-center justify-between gap-2">
+                              <span className="font-semibold text-xs truncate">
+                                {item.title || 'Unbenannt'}
+                              </span>
+                              {isSelected && (
+                                <span className="hidden sm:inline-flex items-center text-[10px] text-accent gap-0.5 shrink-0">
+                                  <span>Öffnen</span>
+                                  <CornerDownLeft className="w-3 h-3" />
+                                </span>
+                              )}
+                            </div>
+
+                            {item.snippet && (
+                              <div>
+                                <SnippetRenderer snippet={item.snippet} />
+                              </div>
+                            )}
+                          </div>
+                        </div>
+                      );
+                    })}
+                  </div>
+                </div>
+              );
+            })
+          )}
+        </div>
+
+        {/* Footer Shortcut Bar (Desktop) */}
+        <div className="hidden sm:flex items-center justify-between px-4 py-2 bg-canvas/40 border-t border-border text-[11px] text-muted shrink-0">
+          <div className="flex items-center gap-3">
+            <span>
+              <kbd className="px-1 py-0.5 bg-panel border border-border rounded font-mono text-[10px] text-accent">↑</kbd>{' '}
+              <kbd className="px-1 py-0.5 bg-panel border border-border rounded font-mono text-[10px] text-accent">↓</kbd> Navigieren
+            </span>
+            <span>
+              <kbd className="px-1 py-0.5 bg-panel border border-border rounded font-mono text-[10px] text-accent">↵</kbd> Auswählen
+            </span>
+            <span>
+              <kbd className="px-1 py-0.5 bg-panel border border-border rounded font-mono text-[10px] text-accent">Esc</kbd> Schließen
+            </span>
+          </div>
+
+          <div>
+            <span>{flatHits.length} Treffer</span>
+          </div>
+        </div>
+      </div>
+    </div>
+  );
+};