fix: restore prominent realtime Talk navigation

web/style.css

@@ -1546,3 +1546,7 @@ dialog h2 {font-size:22px;margin-bottom:16px;}
 
 #researchMode {max-width:130px;padding:7px 8px;border:1px solid var(--line);border-radius:6px;background:var(--canvas);color:var(--ink);font:inherit;font-size:13px;}
 #researchModeLabel {font-size:12px;color:var(--ink-muted);}
+
+.talk-trigger {display:inline-flex;align-items:center;justify-content:center;min-height:44px;min-width:106px;background:var(--surface-raised);color:var(--accent);font-weight:600;white-space:nowrap;}
+.talk-trigger::before {content:"";display:inline-block;width:8px;height:13px;border:1.5px solid currentColor;border-radius:6px;margin-right:8px;}
+@media(max-width:760px) {.talk-trigger {min-width:106px;padding:10px;font-size:13px;} .chat-topbar {gap:4px;} .feature-actions:has(button:disabled) {display:none;}}