feat: add transitions and micro-interactions across all views

- Page transitions with slide-up/fade on route changes (App.vue)
- NavRail sliding active indicator with spring-like easing
- List enter/leave/move animations on Entries, Projects, Clients, Timer
- Modal enter/leave transitions with scale+fade on all dialogs
- Dropdown transitions with overshoot on all select/picker components
- Button feedback (scale on hover/active), card hover lift effects
- Timer pulse on start, glow on stop, floating empty state icons
- Content fade-in on Dashboard, Reports, Calendar, Timesheet
- Tag chip enter/leave animations in AppTagInput
- Progress bar smooth width transitions
- Implementation plan document

src/views/TimesheetView.vue

@@ -35,7 +35,8 @@
     </div>
 
     <!-- Timesheet Table -->
-    <div class="bg-bg-surface rounded-lg overflow-hidden">
+    <Transition name="fade" mode="out-in">
+    <div :key="weekStart" class="bg-bg-surface rounded-lg overflow-hidden">
       <table class="w-full">
         <thead>
           <tr class="border-b border-border-subtle">
@@ -156,6 +157,7 @@
         </tfoot>
       </table>
     </div>
+    </Transition>
 
     <!-- Add Row Button -->
     <button