Adds double-click to edit support for rates

Enables quick editing of salary rates by double-clicking card inputs

Introduces functionality to:
- Open rates drawer on double-click
- Automatically focus and select corresponding input
- Add temporary highlight to edited row

PlanTempus.Application/wwwroot/css/employees.css

@@ -814,6 +814,23 @@ swp-simple-item {
   }
 }
 
+/* ===========================================
+   FOCUS HIGHLIGHT (double-click to edit)
+   =========================================== */
+@keyframes focus-blink {
+  0%, 100% { background: transparent; }
+  25%, 75% { background: var(--bg-teal-medium); }
+}
+
+swp-data-row.focus-highlight {
+  animation: focus-blink 1s ease-out;
+
+  & input {
+    outline: 2px solid var(--color-teal);
+    outline-offset: 2px;
+  }
+}
+
 /* ===========================================
    STATS BOOKINGS TABLE
    =========================================== */