Implement fixed-height month view rows with event overflow handling

- Change calendar grid to use equal row heights instead of min-height on cells
- Add "+n more" indicator for days with too many events to display
- Limit visible events to fit available space (default 3 events per day)
- Add window resize handler to recalculate event limits dynamically
- Remove gaps between calendar rows for cleaner appearance

🤖 Generated with [Claude Code](https://claude.ai/code)

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

styles.css

@@ -484,8 +484,10 @@ body {
 .calendar-grid {
     display: grid;
     grid-template-columns: repeat(7, 1fr);
+    grid-template-rows: auto repeat(6, 1fr);
     flex: 1;
     background: white;
+    gap: 0;
 }
 
 /* Week View Container */
@@ -743,12 +745,12 @@ body {
 .calendar-day {
     border: 1px solid #f0f0f0;
     padding: 0.75rem;
-    min-height: 100px;
     display: flex;
     flex-direction: column;
     cursor: pointer;
     transition: background-color 0.2s;
     position: relative;
+    overflow: hidden;
 }
 
 .calendar-day:hover {
@@ -808,6 +810,14 @@ body {
     color: #1976d2;
 }
 
+.day-events {
+    flex: 1;
+    display: flex;
+    flex-direction: column;
+    gap: 2px;
+    overflow: hidden;
+}
+
 .event-indicators {
     flex: 1;
     display: flex;
@@ -815,6 +825,22 @@ body {
     gap: 2px;
 }
 
+.more-events-indicator {
+    font-size: 0.7rem;
+    color: #666;
+    font-weight: 500;
+    padding: 2px 4px;
+    text-align: center;
+    background: #f5f5f5;
+    border-radius: 3px;
+    cursor: pointer;
+    transition: background-color 0.2s;
+}
+
+.more-events-indicator:hover {
+    background: #e0e0e0;
+}
+
 .event-box {
     /* Background color will be set inline via style attribute */
     color: white;