feat(quick-260916-bwo): Abstaende halbiert — Seitenrahmen p-3 (alle Seiten), Dashboard p-2, Grid 8 px, Widget-Innenabstaende

- app-shell.tsx: main p-3 (12 px statt 24) — gilt fuer alle Seiten, Nachtrag des Users
- page.tsx: Container relative p-2, Umschalter right-2 top-2; mt-8 bleibt (Umschalter 36 px hoch, sonst Ueberlappung)
- link/favorites p-1, calendar p-1.5 (Zustandsansichten p-2), search px-1.5, note-Kopfzeile px-1.5
- Grid-Abstand 8 px bereits in Task 1, Uhr/Stoppuhr/Rechner-Innenabstaende bereits in 2a

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018N9CD3ebPKm1b32bPpBknY

apps/web/src/components/dashboard/widgets/calendar-widget.tsx

@@ -77,7 +77,7 @@ export function CalendarWidget({ config }: WidgetProps) {
   // Loading state
   if (isLoading) {
     return (
-      <div className="flex h-full items-center justify-center p-4">
+      <div className="flex h-full items-center justify-center p-2">
         <span className="text-sm text-muted-foreground">
           {t('calendar.loading')}
         </span>
@@ -88,7 +88,7 @@ export function CalendarWidget({ config }: WidgetProps) {
   // No sources configured
   if (hasSources === false) {
     return (
-      <div className="flex h-full items-center justify-center p-4">
+      <div className="flex h-full items-center justify-center p-2">
         <span className="text-sm text-muted-foreground">
           {t('calendar.emptyNoSources')}
         </span>
@@ -99,7 +99,7 @@ export function CalendarWidget({ config }: WidgetProps) {
   // Sources exist but no events
   if (events.length === 0) {
     return (
-      <div className="flex h-full items-center justify-center p-4">
+      <div className="flex h-full items-center justify-center p-2">
         <span className="text-sm text-muted-foreground">
           {t('calendar.emptyNoEvents')}
         </span>
@@ -109,7 +109,7 @@ export function CalendarWidget({ config }: WidgetProps) {
 
   // Events list
   return (
-    <div className="flex h-full flex-col overflow-y-auto p-3">
+    <div className="flex h-full flex-col overflow-y-auto p-1.5">
       <ul className="space-y-2">
         {events.map((event) => (
           <li