UI polish: hover lift, skeleton loaders, empty states, badge contrast, transitions

Card & row interactions:
- NoteCard, TaskCard, ProjectCard: translateY(-2px) lift on hover + extended transitions
- Kanban task cards (ProjectView), note rows: same lift treatment
- Task rows in flat/grouped list: soft indigo bg tint on hover
- Chat conversation items: left-border accent + bg tint on hover (was border-only)
- HomeView project mini-cards: translateY(-2px) lift on hover

Global feedback:
- Buttons: scale(0.97) on :active press (theme.css, :not(:disabled) scoped)
- TagPill: color → primary + indigo bg tint on hover
- StatusBadge: increased opacity 15% → 22% + stronger text color for readability

Loading & empty states:
- TasksListView: shimmer skeleton loader (6 rows) + rich empty state with CTA
- ProjectListView: shimmer skeleton cards (4) + rich empty state with CTA
- HomeView: section-empty messages for overdue/high-priority/notes sections
- ProjectView kanban columns: dashed-border styled empty state

Transitions & graph:
- WorkspaceView panels: panel-fade opacity transition on show/hide (v-if inner wrap)
- GraphView D3 nodes: grow to r*1.3 + bold label on mouseover (150ms transition)
- Milestone action buttons: base opacity 0 → 0.35 for discoverability

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

frontend/src/views/HomeView.vue

@@ -397,6 +397,7 @@ function clearDashboardResponse() {
               />
             </div>
           </section>
+          <p v-else class="section-empty">All clear</p>
 
           <section v-if="dueTodayTasks.length" class="section">
             <h3 class="section-title">Due Today</h3>
@@ -439,6 +440,7 @@ function clearDashboardResponse() {
               />
             </div>
           </section>
+          <p v-else class="section-empty">All clear</p>
 
           <section v-if="inProgressTasks.length" class="section">
             <h3 class="section-title">In Progress</h3>
@@ -484,7 +486,7 @@ function clearDashboardResponse() {
           />
         </div>
         <div v-else class="empty-state">
-          <p class="empty-text">No notes yet.</p>
+          <p class="section-empty">No recent notes</p>
           <router-link to="/notes/new" class="btn-cta">+ New Note</router-link>
         </div>
       </div>
@@ -691,10 +693,11 @@ function clearDashboardResponse() {
   text-decoration: none;
   color: inherit;
   box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06), 0 0 0 1px rgba(99, 102, 241, 0.06);
-  transition: box-shadow 0.15s;
+  transition: box-shadow 0.18s ease, transform 0.18s ease;
 }
 .project-mini-card:hover {
   box-shadow: 0 4px 16px rgba(0, 0, 0, 0.10), 0 0 0 1px rgba(99, 102, 241, 0.14);
+  transform: translateY(-2px);
 }
 .project-mini-title {
   font-size: 0.9rem;
@@ -748,6 +751,15 @@ function clearDashboardResponse() {
 }
 .muted { color: var(--color-text-muted); }
 
+.section-empty {
+  text-align: center;
+  padding: 1rem 0.5rem;
+  color: var(--color-text-muted);
+  font-size: 0.82rem;
+  font-style: italic;
+  margin: 0;
+}
+
 .loading { color: var(--color-text-secondary); }
 .empty-state { text-align: center; padding: 1.5rem 0; }
 .empty-state::before {