Move caller dialog to Sonnet 4.6, add SearXNG for Devon, and fix stale model ids

Working-tree changes that had accumulated without being committed. The test
updates matter most: tests/test_caller_gen.py was left behind when caller_gen
started requiring voice and age in regulars_included, so the committed tree had
a failing suite that only passed locally.

- Caller dialog moves from Haiku 4.5 to Sonnet 4.6 (~$1/show to ~$3-4/show)
- Grok pinned to x-ai/grok-4.3; grok-4, grok-4-fast and grok-4.1-fast were
  retired from OpenRouter, and llm.py swallows the 404 and returns empty text,
  so a retired id makes callers go silent with nothing in the logs
- Devon's web_search now runs against SearXNG on the NAS
- Assorted TTS, audio, news, cost tracker and control-panel changes
- CLAUDE.md updated to match

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

frontend/css/style.css

@@ -1434,12 +1434,32 @@ section h2 {
 
 .vm-item {
     display: flex;
-    align-items: center;
-    justify-content: space-between;
+    flex-direction: column;
+    gap: 4px;
     padding: 6px 8px;
     border-bottom: 1px solid rgba(232, 121, 29, 0.08);
 }
 
+.vm-row {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    gap: 8px;
+}
+
+.vm-transcript {
+    font-size: 0.8rem;
+    line-height: 1.35;
+    color: var(--text-muted);
+    border-left: 2px solid rgba(232, 121, 29, 0.25);
+    padding-left: 8px;
+}
+
+.vm-transcript-pending {
+    font-style: italic;
+    opacity: 0.6;
+}
+
 .vm-item:last-child {
     border-bottom: none;
 }