feat: déplacer bouton ℹ hors du PeriodSelector → bouton flottant isolé

- Sous ☰ sur mobile (top-16 left-4), top-4 left-4 sur desktop
- PeriodSelector : suppression prop onInfo + bouton ℹ intégré

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

src/components/PeriodSelector.tsx

@@ -8,7 +8,6 @@ interface PeriodSelectorProps {
   viewMode: 'heatmap' | 'flow';
   onViewModeChange: (mode: 'heatmap' | 'flow') => void;
   geoPercent?: number | null;
-  onInfo: () => void;
 }
 
 const PERIODS = [
@@ -19,7 +18,7 @@ const PERIODS = [
 
 const PRESET_DAYS = new Set([1, 7, 30]);
 
-export function PeriodSelector({ value, onChange, animationActive, onAnimate, viewMode, onViewModeChange, geoPercent, onInfo }: PeriodSelectorProps) {
+export function PeriodSelector({ value, onChange, animationActive, onAnimate, viewMode, onViewModeChange, geoPercent }: PeriodSelectorProps) {
   const [customOpen, setCustomOpen] = useState(false);
   const [inputVal, setInputVal] = useState('');
   const inputRef = useRef<HTMLInputElement>(null);
@@ -132,15 +131,6 @@ export function PeriodSelector({ value, onChange, animationActive, onAnimate, vi
         </span>
       )}
 
-      <div className="w-px mx-1 bg-[#2e2f3a] self-stretch" />
-
-      <button
-        onClick={onInfo}
-        className="px-2 py-1.5 rounded-md text-sm text-[#6b7280] hover:text-[#d4a843] hover:bg-[#1a1b23] transition-all duration-200 cursor-pointer leading-none"
-        aria-label="Aide"
-      >
-        ℹ
-      </button>
     </div>
   );
 }