some changes

cht/window.py

@@ -30,6 +30,8 @@ class ChtWindow(Adw.ApplicationWindow):
         self._stream_mgr = None
         self._tracker = None
         self._known_frames = set()
+        self._selected_frame = None       # currently selected frame ID
+        self._frame_widgets = {}          # frame_id → outer Box widget
 
         # Timeline is the central state machine
         self._timeline = Timeline()
@@ -168,6 +170,8 @@ class ChtWindow(Adw.ApplicationWindow):
             self._stream_mgr.stop_all()
             self._stream_mgr = None
         self._known_frames = set()
+        self._selected_frame = None
+        self._frame_widgets = {}
 
         self._connect_btn.set_label("Connect")
         self._connect_btn.remove_css_class("destructive-action")
@@ -349,13 +353,28 @@ class ChtWindow(Adw.ApplicationWindow):
         outer.set_margin_top(4)
         outer.set_margin_bottom(4)
 
-        # Quick action buttons
+        # Quick action buttons + model selector
         actions_box = Gtk.Box(orientation=Gtk.Orientation.HORIZONTAL, spacing=4)
-        for label in ACTIONS:
+        for label, verb in ACTIONS.items():
             btn = Gtk.Button(label=label)
             btn.add_css_class("flat")
-            btn.connect("clicked", lambda b, l=label: self._send_message(ACTIONS[l]))
+            btn.connect("clicked", lambda b, v=verb: self._send_action(v))
             actions_box.append(btn)
+
+        # Model dropdown (right-aligned)
+        spacer = Gtk.Box()
+        spacer.set_hexpand(True)
+        actions_box.append(spacer)
+
+        model_label = Gtk.Label(label="Model:")
+        model_label.add_css_class("dim-label")
+        actions_box.append(model_label)
+
+        self._model_dropdown = Gtk.DropDown.new_from_strings([])
+        self._model_dropdown.set_size_request(200, -1)
+        self._model_dropdown.connect("notify::selected", self._on_model_changed)
+        actions_box.append(self._model_dropdown)
+
         outer.append(actions_box)
 
         # Text entry + send
@@ -376,6 +395,27 @@ class ChtWindow(Adw.ApplicationWindow):
         frame.set_child(outer)
         return frame
 
+    def _send_action(self, verb: str):
+        """Send a predefined action with the selected frame."""
+        if not self._selected_frame:
+            self._append_agent_output("Select a frame first.\n")
+            return
+        self._send_message(f"{verb} @{self._selected_frame}")
+
+    def _select_frame(self, frame_id: str):
+        """Toggle selection of a frame thumbnail."""
+        # Deselect previous
+        if self._selected_frame and self._selected_frame in self._frame_widgets:
+            self._frame_widgets[self._selected_frame].remove_css_class("frame-selected")
+
+        if self._selected_frame == frame_id:
+            self._selected_frame = None
+            return
+
+        self._selected_frame = frame_id
+        if frame_id in self._frame_widgets:
+            self._frame_widgets[frame_id].add_css_class("frame-selected")
+
     def _send_message(self, text: str | None = None):
         if text is None:
             text = self._input_entry.get_text().strip()
@@ -570,15 +610,37 @@ class ChtWindow(Adw.ApplicationWindow):
             buf.apply_tag(tag, buf.get_iter_at_mark(mark), it)
             buf.delete_mark(mark)
 
+    def _on_model_changed(self, dropdown, _pspec):
+        idx = dropdown.get_selected()
+        model = self._agent.available_models[idx] if idx < len(self._agent.available_models) else None
+        if model:
+            self._agent.model = model
+            log.info("Model switched to %s", model)
+
+    def _populate_model_dropdown(self):
+        models = self._agent.available_models
+        if not models:
+            return
+        string_list = Gtk.StringList.new(models)
+        self._model_dropdown.set_model(string_list)
+        # Select current model
+        current = self._agent.model
+        for i, m in enumerate(models):
+            if m == current:
+                self._model_dropdown.set_selected(i)
+                break
+
     def _check_agent_auth(self):
         import os
         if os.environ.get("GROQ_API_KEY") or os.environ.get("OPENAI_API_KEY"):
-            return  # using external provider, no CLI check needed
+            self._populate_model_dropdown()
+            return
         err = check_claude_cli()
         if err:
             self._append_agent_output(f"⚠ {err}\n")
         else:
             self._append_agent_output(f"Agent ready ({self._agent.provider_name})\n")
+            self._populate_model_dropdown()
 
     def _append_agent_output(self, text: str):
         buf = self._agent_output_view.get_buffer()
@@ -636,12 +698,11 @@ class ChtWindow(Adw.ApplicationWindow):
         label.set_ellipsize(Pango.EllipsizeMode.END)
         box.append(label)
 
-        # Click to highlight — does NOT switch mode or seek
-        # (future: jump to timestamp in scrub bar without leaving live)
         gesture = Gtk.GestureClick()
-        gesture.connect("released", lambda g, n, x, y, fid=frame_id: self._send_message(f"solve this @{fid}"))
+        gesture.connect("released", lambda g, n, x, y, fid=frame_id: self._select_frame(fid))
         box.add_controller(gesture)
 
+        self._frame_widgets[frame_id] = box
         self._frames_strip.append(box)
 
         # Auto-scroll to show the latest frame