feat(dashboard): add click-outside dismissal for autocomplete dropdown

Closes bd-3ny. Added mousedown listener that dismisses the dropdown when
clicking outside both the dropdown and textarea. Uses early return to avoid
registering listeners when dropdown is already closed.

bin/amc-hook

@@ -170,6 +170,8 @@ def main():
                 existing["last_event"] = f"PreToolUse({tool_name})"
                 existing["last_event_at"] = now
                 existing["pending_questions"] = _extract_questions(hook)
+                # Track when turn paused for duration calculation
+                existing["turn_paused_at"] = now
                 _atomic_write(session_file, existing)
                 _append_event(session_id, {
                     "event": f"PreToolUse({tool_name})",
@@ -189,6 +191,16 @@ def main():
                 existing["last_event"] = f"PostToolUse({tool_name})"
                 existing["last_event_at"] = now
                 existing.pop("pending_questions", None)
+                # Accumulate paused time for turn duration calculation
+                paused_at = existing.pop("turn_paused_at", None)
+                if paused_at:
+                    try:
+                        paused_start = datetime.fromisoformat(paused_at.replace("Z", "+00:00"))
+                        paused_end = datetime.fromisoformat(now.replace("Z", "+00:00"))
+                        paused_ms = int((paused_end - paused_start).total_seconds() * 1000)
+                        existing["turn_paused_ms"] = existing.get("turn_paused_ms", 0) + paused_ms
+                    except (ValueError, TypeError):
+                        pass
                 _atomic_write(session_file, existing)
                 _append_event(session_id, {
                     "event": f"PostToolUse({tool_name})",
@@ -237,6 +249,20 @@ def main():
             "zellij_pane": os.environ.get("ZELLIJ_PANE_ID", ""),
         }
 
+        # Turn timing: track working time from user prompt to completion
+        if event == "UserPromptSubmit":
+            # New turn starting - reset turn timing
+            state["turn_started_at"] = now
+            state["turn_paused_ms"] = 0
+        else:
+            # Preserve turn timing from existing state
+            if "turn_started_at" in existing:
+                state["turn_started_at"] = existing["turn_started_at"]
+            if "turn_paused_ms" in existing:
+                state["turn_paused_ms"] = existing["turn_paused_ms"]
+            if "turn_paused_at" in existing:
+                state["turn_paused_at"] = existing["turn_paused_at"]
+
         # Store prose question if detected
         if prose_question:
             state["pending_questions"] = [{