feat: UI/UX improvements pass + fix photo 404 in Docker

Photos:
- Serve uploads via /api/photos/[filename] from UPLOAD_DIR env var
- Default UPLOAD_DIR=/data/uploads (mount as Docker volume for persistence)
- Upload route creates dir on demand, no root-permission issue
- Dockerfile creates /data/uploads owned by nextjs user

Growth:
- Show chart with single measurement (was hidden until 2+ points)
- PC label expanded to "PC — Périmètre crânien (cm)"
- WHO percentile ⓘ tooltip explaining P50/P3-P97
- Date field defaults to today in add-measurement form

Stats:
- Heatmap legend shows actual counts (0 1 2 3 4+) not just Moins/Plus
- Sleep timeline labeled "Fenêtre 19h – 11h"

Timeline:
- Filter type persisted in URL param (?type=...) — survives navigation
- Inline note save shows ✓ flash after blur
- Photo thumbnails open in new tab

Photos:
- Lightbox wraps: next on last → first, prev on first → last

Search:
- Result count header "X événements · Y notes"
- Event results link to /timeline?date=...&type=...
- Note results link to /notes?date=...

Notes:
- Unsaved indicator (amber dot) while textarea dirty, green ✓ after save

Milestones:
- Sort by date ascending within each month group

Settings:
- Pushover key field has eye toggle (show/hide)
- API key delete shows confirmation with key name
- All sections wrapped in collapsible SectionCard accordion

Dashboard:
- Empty state callout for new users with no events today

Event modal:
- Milk lot selection shows "Sélectionnez un lot — il sera marqué comme utilisé"
- Photo upload validates 5MB client-side before sending
- Timer resume shows "Reprise du chronomètre" when loaded from localStorage

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

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

@@ -8,6 +8,7 @@ import { useBaby } from "@/contexts/baby-context";
 import { format } from "date-fns";
 import { fr } from "date-fns/locale";
 import { Search, FileText, StickyNote } from "lucide-react";
+import Link from "next/link";
 
 interface SearchEvent {
   id: string;
@@ -108,6 +109,12 @@ export default function SearchPage() {
         <p className="text-sm text-slate-400 dark:text-slate-500 text-center py-12">Aucun résultat pour « {debouncedQ} »</p>
       )}
 
+      {debouncedQ.length >= 2 && !isFetching && hasResults && (
+        <p className="text-xs text-slate-400 mb-3">
+          {events.length} événement{events.length !== 1 ? "s" : ""} · {notes.length} note{notes.length !== 1 ? "s" : ""}
+        </p>
+      )}
+
       {events.length > 0 && (
         <div className="mb-6">
           <h2 className="text-xs font-semibold text-slate-400 dark:text-slate-500 uppercase tracking-wider mb-3 flex items-center gap-1.5">
@@ -119,7 +126,7 @@ export default function SearchPage() {
               const cfg = EVENT_CONFIG[ev.type];
               const summary = eventSummary(ev);
               return (
-                <div key={ev.id} className="flex items-start gap-3 px-4 py-3">
+                <Link key={ev.id} href={`/timeline?date=${ev.startedAt.slice(0, 10)}&type=${ev.type}`} className="flex items-start gap-3 px-4 py-3 cursor-pointer hover:bg-slate-50 dark:hover:bg-slate-700/50 transition rounded-lg">
                   <div className={`w-8 h-8 rounded-lg ${cfg.bgClass} flex items-center justify-center flex-shrink-0 mt-0.5`}>
                     <EventIcon name={cfg.icon} className={`w-4 h-4 ${cfg.colorClass}`} />
                   </div>
@@ -137,7 +144,7 @@ export default function SearchPage() {
                       {format(new Date(ev.startedAt), "d MMM yyyy HH:mm", { locale: fr })} · {ev.user.name}
                     </p>
                   </div>
-                </div>
+                </Link>
               );
             })}
           </div>
@@ -152,14 +159,14 @@ export default function SearchPage() {
           </h2>
           <div className="bg-white dark:bg-slate-800 border border-slate-200 dark:border-slate-700 rounded-xl overflow-hidden divide-y divide-slate-100 dark:divide-slate-700">
             {notes.map((note) => (
-              <div key={note.id} className="px-4 py-3">
+              <Link key={note.id} href={`/notes?date=${note.date.slice(0, 10)}`} className="block px-4 py-3 cursor-pointer hover:bg-slate-50 dark:hover:bg-slate-700/50 transition rounded-lg">
                 <p className="text-xs text-slate-400 dark:text-slate-500 mb-1">
                   {format(new Date(note.date), "d MMMM yyyy", { locale: fr })} · {note.user.name}
                 </p>
                 <p className="text-sm text-slate-700 dark:text-slate-200 line-clamp-3">
                   {highlight(note.content, debouncedQ)}
                 </p>
-              </div>
+              </Link>
             ))}
           </div>
         </div>