Strip all box-shadow/text-shadow from hover states inside ascii-frame-outer

These non-composited properties force CPU repaints of the surrounding
paint region (the section itself) every time hover enters or exits.
With the fixed overlay (body::before scanline), each such repaint
requires the compositor to re-blend the layer, visible as a blink.

Removed from dashboard.css:
- btn/button/btn-base:hover: box-shadow + text-shadow
- th:hover: text-shadow
- ticket-link:hover: text-shadow
- pagination button:hover: box-shadow + transform + transition:all
- ticket-card-row:hover: box-shadow + transition:all -> background only
- .btn ripple rule: transition:all -> specific properties
- ascii-frame-outer: removed will-change/translateZ (GPU upload worse)

Removed from ticket.css:
- metadata-select:hover: box-shadow; transition:all -> border-color
- comment:hover: box-shadow
- btn:hover: box-shadow
- mention:hover: text-shadow

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

assets/css/dashboard.css

@@ -317,7 +317,7 @@ tbody tr {
 
 /* Button press effect */
 .btn {
-    transition: all 0.15s ease;
+    transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
     position: relative;
     overflow: hidden;
 }
@@ -594,12 +594,11 @@ h1 {
         background: var(--bg-secondary);
         border: 1px solid var(--terminal-green);
         border-left: 4px solid var(--terminal-green);
-        transition: all 0.2s ease;
+        transition: background 0.2s ease;
     }
 
     .ticket-card-row:hover {
         background: rgba(0, 255, 65, 0.1);
-        box-shadow: var(--glow-green);
     }
 
     .ticket-card-row.priority-1 { border-left-color: var(--priority-1); }
@@ -991,8 +990,6 @@ h1 {
     padding: 0;
     background: var(--bg-primary);
     margin-bottom: 2rem;
-    will-change: transform;
-    transform: translateZ(0);
 }
 
 .ascii-frame-outer::before {
@@ -1642,8 +1639,6 @@ button:hover {
     background: rgba(0, 255, 65, 0.15);
     color: var(--terminal-amber);
     border-color: var(--terminal-amber);
-    text-shadow: var(--glow-amber-intense);
-    box-shadow: var(--glow-amber-intense);
 }
 
 .btn:active,
@@ -1780,7 +1775,6 @@ th {
 }
 
 th:hover {
-    text-shadow: var(--glow-amber-intense);
     background-color: rgba(255, 176, 0, 0.05);
 }
 
@@ -2844,7 +2838,6 @@ input[type="checkbox"]:checked {
 .ticket-link:hover {
     background: rgba(0, 255, 65, 0.2);
     border-color: var(--terminal-green);
-    text-shadow: var(--glow-green-intense);
 }
 
 /* ===== PAGINATION STYLES ===== */
@@ -2861,15 +2854,12 @@ input[type="checkbox"]:checked {
     color: var(--terminal-green);
     border-radius: 0;
     cursor: pointer;
-    transition: all 0.3s ease;
+    transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
     font-family: var(--font-mono);
-    text-shadow: var(--glow-green);
 }
 
 .pagination button:hover {
     background: rgba(0, 255, 65, 0.15);
-    box-shadow: var(--glow-green);
-    transform: translateY(-1px);
 }
 
 .pagination button.active {