feat: finish remaining improvements — search filters, stats zero-fill, notes nav warning

- search: date range (7j/30j/90j/Tout) + type (Repas/Sommeil/Couche/Santé) filter chips
- stats: missing-day gaps filled with 0 — lines no longer break on no-data days
- notes: beforeunload handler warns before closing tab with unsaved changes

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/app/(app)/notes/page.tsx

@@ -103,6 +103,14 @@ export default function NotesPage() {
     setDirty(false);
   }, [currentNote?.id, dateStr, isDayLoading]);
 
+  useEffect(() => {
+    const handler = (e: BeforeUnloadEvent) => {
+      if (dirty) { e.preventDefault(); e.returnValue = ""; }
+    };
+    window.addEventListener("beforeunload", handler);
+    return () => window.removeEventListener("beforeunload", handler);
+  }, [dirty]);
+
   function goToPrevDay() {
     setCurrentDate((d) => startOfDay(subDays(d, 1)));
   }

src/app/(app)/search/page.tsx

@@ -60,6 +60,8 @@ export default function SearchPage() {
   const { selectedBaby } = useBaby();
   const [q, setQ] = useState("");
   const [debouncedQ, setDebouncedQ] = useState("");
+  const [filterDays, setFilterDays] = useState<number | null>(null);
+  const [filterType, setFilterType] = useState<string | null>(null);
   const inputRef = useRef<HTMLInputElement>(null);
 
   useEffect(() => { inputRef.current?.focus(); }, []);
@@ -77,8 +79,26 @@ export default function SearchPage() {
     placeholderData: { events: [], notes: [] },
   });
 
-  const events = data?.events ?? [];
-  const notes = data?.notes ?? [];
+  const typeMap: Record<string, string[]> = {
+    "Repas": ["BREASTFEED", "BOTTLE"],
+    "Sommeil": ["NAP", "NIGHT_SLEEP"],
+    "Couche": ["DIAPER_WET", "DIAPER_STOOL"],
+    "Santé": ["TEMPERATURE", "MEDICATION", "SYMPTOM"],
+  };
+  const cutoff = filterDays ? new Date(Date.now() - filterDays * 86400000) : null;
+
+  const filteredEvents = (data?.events ?? []).filter(ev => {
+    if (cutoff && new Date(ev.startedAt) < cutoff) return false;
+    if (filterType && !typeMap[filterType]?.includes(ev.type)) return false;
+    return true;
+  });
+  const filteredNotes = (data?.notes ?? []).filter(note => {
+    if (cutoff && new Date(note.date) < cutoff) return false;
+    return true;
+  });
+
+  const events = filteredEvents;
+  const notes = filteredNotes;
   const hasResults = events.length > 0 || notes.length > 0;
   const searched = debouncedQ.length >= 2;
 
@@ -101,6 +121,29 @@ export default function SearchPage() {
         )}
       </div>
 
+      {q.length >= 2 && (
+        <div className="flex flex-wrap gap-2 mt-2 mb-3">
+          {([["7j", 7], ["30j", 30], ["90j", 90], ["Tout", null]] as [string, number|null][]).map(([label, days]) => (
+            <button key={label}
+              onClick={() => setFilterDays(days)}
+              className={`px-2.5 py-1 rounded-full text-xs font-medium transition ${filterDays === days ? "bg-indigo-600 text-white" : "bg-slate-100 dark:bg-slate-700 text-slate-600 dark:text-slate-300"}`}>
+              {label}
+            </button>
+          ))}
+          <span className="text-slate-300 dark:text-slate-600 self-center">·</span>
+          {["Repas", "Sommeil", "Couche", "Santé"].map((label) => {
+            const active = filterType === label;
+            return (
+              <button key={label}
+                onClick={() => setFilterType(active ? null : label)}
+                className={`px-2.5 py-1 rounded-full text-xs font-medium transition ${active ? "bg-slate-700 text-white dark:bg-slate-200 dark:text-slate-900" : "bg-slate-100 dark:bg-slate-700 text-slate-600 dark:text-slate-300"}`}>
+                {label}
+              </button>
+            );
+          })}
+        </div>
+      )}
+
       {!searched && (
         <p className="text-sm text-slate-400 dark:text-slate-500 text-center py-12">Saisissez au moins 2 caractères</p>
       )}

src/app/(app)/stats/page.tsx

@@ -109,12 +109,12 @@ function buildDurationTrend(events: Event[], days: number) {
         e.endedAt &&
         format(new Date(e.startedAt), "yyyy-MM-dd") === key
     );
-    if (dayEvents.length === 0) return { label, nap: null, night: null };
+    if (dayEvents.length === 0) return { label, nap: 0, night: 0 };
     const napEvents = dayEvents.filter((e) => e.type === "NAP");
     const nightEvents = dayEvents.filter((e) => e.type === "NIGHT_SLEEP");
     const avg = (evs: Event[]) =>
       evs.length === 0
-        ? null
+        ? 0
         : Math.round(
             evs.reduce(
               (acc, e) => acc + (new Date(e.endedAt!).getTime() - new Date(e.startedAt).getTime()) / 60000,