feat: add Calendar, Timesheet, and MiniTimer views

Calendar shows weekly time-block layout with hour rows, entry positioning,
current time indicator, and week navigation. Timesheet provides a weekly
grid with project/task rows, day columns, totals, and add-row functionality.
MiniTimer is a minimal always-on-top timer display for the floating window.

src/components/NavRail.vue

@@ -8,6 +8,8 @@ import {
   Users,
   FolderKanban,
   List,
+  CalendarDays,
+  Grid3X3,
   BarChart3,
   FileText,
   Settings
@@ -23,6 +25,8 @@ const navItems = [
   { name: 'Clients', path: '/clients', icon: Users },
   { name: 'Projects', path: '/projects', icon: FolderKanban },
   { name: 'Entries', path: '/entries', icon: List },
+  { name: 'Calendar', path: '/calendar', icon: CalendarDays },
+  { name: 'Timesheet', path: '/timesheet', icon: Grid3X3 },
   { name: 'Invoices', path: '/invoices', icon: FileText },
   { name: 'Reports', path: '/reports', icon: BarChart3 },
   { name: 'Settings', path: '/settings', icon: Settings }
@@ -65,12 +69,16 @@ function navigate(path: string) {
       </button>
     </div>
 
-    <!-- Timer running indicator (bottom) -->
+    <!-- Timer status indicator (bottom) -->
     <div class="pb-4">
       <div
         v-if="timerStore.isRunning"
         class="w-2 h-2 rounded-full bg-status-running animate-pulse-dot"
       />
+      <div
+        v-else-if="timerStore.isPaused"
+        class="w-2 h-2 rounded-full bg-status-warning animate-pulse-dot"
+      />
     </div>
   </nav>
 </template>