feat: animated border on active FAB and grayscale inactive FABs

Active terminal FAB shows a rotating conic-gradient border animation
(cyan/indigo) on all three locations: main FAB (T1), AgentBadge, and
mini FABs (T2-T5). Inactive FABs appear in grayscale with reduced
brightness, brightening slightly on hover.

frontend/src/App.vue

@@ -85,6 +85,13 @@ const keyboardVisible = ref(false)    // Virtual keyboard visible
 // Whether any terminal exists (T1+)
 const hasTerminals = computed(() => sessionState.terminalRegistry.length > 0)
 
+// Whether terminal 1 is the currently active terminal
+const isT1Active = computed(() => {
+  const reg = sessionState.terminalRegistry
+  if (!reg.length) return false
+  return reg[0].transcriptSessionId === transcriptDebugRef.value?.activeTerminalSessionId
+})
+
 // Extra terminals (T2-T5) from Pinia store — fully reactive, no template ref dependency
 const extraTerminals = computed(() => {
   const reg = sessionState.terminalRegistry
@@ -366,7 +373,7 @@ watch(() => route.name, (newPage) => {
         <span class="fab-bubble b3"></span>
         <button
           class="transcript-fab"
-          :class="{ active: showTranscriptDebug }"
+          :class="{ active: showTranscriptDebug, 't1-active': isT1Active }"
           @click="handleMainFabClick"
           @contextmenu.prevent
           title="Transcript Debug"
@@ -845,8 +852,8 @@ watch(() => route.name, (newPage) => {
   box-shadow:
     0 2px 4px rgba(0, 0, 0, 0.5),
     0 6px 16px rgba(0, 0, 0, 0.6),
-    0 12px 28px rgba(0, 0, 0, 0.4),
-    inset 0 1px 0 rgba(14, 165, 233, 0.12);
+    0 12px 28px rgba(0, 0, 0, 0.4);
+  filter: grayscale(1) brightness(0.6);
   transition: all 0.2s ease;
   -webkit-user-select: none;
   user-select: none;
@@ -867,15 +874,14 @@ watch(() => route.name, (newPage) => {
   pointer-events: none;
 }
 
-.transcript-fab:hover {
+.transcript-fab:not(.t1-active):hover {
   transform: translateY(-2px);
   border-color: rgba(14, 165, 233, 0.35);
+  filter: grayscale(0.5) brightness(0.8);
   box-shadow:
     0 4px 8px rgba(0, 0, 0, 0.5),
     0 10px 24px rgba(0, 0, 0, 0.6),
-    0 16px 36px rgba(0, 0, 0, 0.4),
-    0 0 14px rgba(14, 165, 233, 0.15),
-    inset 0 1px 0 rgba(14, 165, 233, 0.2);
+    0 0 14px rgba(14, 165, 233, 0.15);
   color: #38bdf8;
 }
 
@@ -888,6 +894,31 @@ watch(() => route.name, (newPage) => {
   color: #a5f3fc;
 }
 
+.transcript-fab.t1-active {
+  border: 2px solid;
+  border-image: conic-gradient(
+    from var(--border-angle, 0deg),
+    rgba(34, 211, 238, 1),
+    rgba(99, 102, 241, 0.7),
+    rgba(34, 211, 238, 0.15),
+    rgba(99, 102, 241, 0.7),
+    rgba(34, 211, 238, 1)
+  ) 1;
+  filter: none;
+  box-shadow: 0 0 12px rgba(34, 211, 238, 0.3);
+  animation: border-spin 3s linear infinite;
+}
+
+@property --border-angle {
+  syntax: "<angle>";
+  initial-value: 0deg;
+  inherits: false;
+}
+
+@keyframes border-spin {
+  to { --border-angle: 360deg; }
+}
+
 .fab-button-area {
   position: relative;
   width: 44px;

frontend/src/components/FloatingTranscriptDebug.vue

@@ -625,7 +625,7 @@ onBeforeUnmount(() => {
               <AgentBadge
                 v-if="selectedAgent"
                 :agent="selectedAgent"
-                :connected="isRealtime"
+                :connected="!!activeTerminalSessionId"
                 :terminals="openTerminals"
                 :active-session-id="activeTerminalSessionId"
                 :model="conversation?.model"

frontend/src/components/transcript-debug/AgentBadge.vue

@@ -147,14 +147,32 @@ onBeforeUnmount(() => document.removeEventListener('mousedown', onClickOutside))
 }
 
 .agent-badge-wrapper.connected {
-  border-color: rgba(34, 197, 94, 0.35);
+  border: 2px solid;
+  border-image: conic-gradient(
+    from var(--border-angle, 0deg),
+    rgba(34, 211, 238, 1),
+    rgba(99, 102, 241, 0.7),
+    rgba(34, 211, 238, 0.15),
+    rgba(99, 102, 241, 0.7),
+    rgba(34, 211, 238, 1)
+  ) 1;
   background: rgba(34, 197, 94, 0.08);
-  box-shadow: 0 0 8px rgba(34, 197, 94, 0.15);
+  box-shadow: 0 0 12px rgba(34, 211, 238, 0.3);
+  animation: border-spin 3s linear infinite;
 }
 
 .agent-badge-wrapper.connected:hover {
   background: rgba(34, 197, 94, 0.15);
-  border-color: rgba(34, 197, 94, 0.5);
+}
+
+@property --border-angle {
+  syntax: "<angle>";
+  initial-value: 0deg;
+  inherits: false;
+}
+
+@keyframes border-spin {
+  to { --border-angle: 360deg; }
 }
 
 .agent-label {

frontend/src/components/transcript-debug/TerminalFabStack.vue

@@ -86,27 +86,51 @@ const artVariants = [
   pointer-events: auto;
   background-size: cover;
   background-repeat: no-repeat;
+  filter: grayscale(1) brightness(0.6);
 }
 
-.terminal-fab:hover {
+.terminal-fab:not(.active):hover {
   transform: translateY(-2px);
   border-color: rgba(14, 165, 233, 0.35);
+  filter: grayscale(0.5) brightness(0.8);
   box-shadow:
     0 4px 8px rgba(0, 0, 0, 0.5),
     0 10px 24px rgba(0, 0, 0, 0.6),
-    0 0 14px rgba(14, 165, 233, 0.15),
-    inset 0 1px 0 rgba(14, 165, 233, 0.2);
+    0 0 14px rgba(14, 165, 233, 0.15);
 }
 
 .terminal-fab:active {
   transform: scale(0.95);
 }
 
+.terminal-fab:focus,
+.terminal-fab:focus-visible {
+  outline: none;
+}
+
 .terminal-fab.active {
-  border-color: rgba(34, 211, 238, 0.4);
-  box-shadow:
-    0 0 6px rgba(34, 211, 238, 0.15),
-    inset 0 0 4px rgba(34, 211, 238, 0.08);
+  border: 2px solid;
+  border-image: conic-gradient(
+    from var(--border-angle, 0deg),
+    rgba(34, 211, 238, 1),
+    rgba(99, 102, 241, 0.7),
+    rgba(34, 211, 238, 0.15),
+    rgba(99, 102, 241, 0.7),
+    rgba(34, 211, 238, 1)
+  ) 1;
+  filter: none;
+  box-shadow: 0 0 12px rgba(34, 211, 238, 0.3);
+  animation: border-spin 3s linear infinite;
+}
+
+@property --border-angle {
+  syntax: "<angle>";
+  initial-value: 0deg;
+  inherits: false;
+}
+
+@keyframes border-spin {
+  to { --border-angle: 360deg; }
 }
 
 .fab-number {