Dashboard: equal 50/50 columns, 2 project cards/row, 3 note cards/row

- grid-template-columns: 3fr 2fr → 1fr 1fr (equal split)
- projects-strip-inline: 3 columns → 2 columns
- notes-mini-grid: auto-fill minmax(220px) → repeat(3, 1fr)

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

frontend/src/views/HomeView.vue

@@ -597,7 +597,7 @@ function clearDashboardResponse() {
 /* Main grid */
 .dashboard-grid {
   display: grid;
-  grid-template-columns: 3fr 2fr;
+  grid-template-columns: 1fr 1fr;
   gap: 2rem;
   align-items: start;
 }
@@ -647,10 +647,10 @@ function clearDashboardResponse() {
   gap: 0.2rem;
 }
 
-/* Notes mini-grid: fills 2 columns when space allows, wraps otherwise */
+/* Notes mini-grid: 3 per row */
 .notes-mini-grid {
   display: grid;
-  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
+  grid-template-columns: repeat(3, 1fr);
   gap: 0.6rem;
 }
 
@@ -660,7 +660,7 @@ function clearDashboardResponse() {
 }
 .projects-strip-inline {
   display: grid;
-  grid-template-columns: repeat(3, 1fr);
+  grid-template-columns: repeat(2, 1fr);
   gap: 0.6rem;
 }
 .project-mini-card {