feat(gui): Implement token budget visualizer

This change adds a progress bar and label to the Provider panel to display the current history token usage against the provider's limit. The UI is updated in real-time.

gui.py

@@ -769,6 +769,17 @@ class App:
         total = usage["input_tokens"] + usage["output_tokens"]
         dpg.set_value("ai_token_usage", f"Tokens: {total} (In: {usage['input_tokens']} Out: {usage['output_tokens']})")
 
+    def _update_telemetry_panel(self):
+        """Updates the token budget visualizer in the Provider panel."""
+        stats = ai_client.get_history_bleed_stats()
+        if dpg.does_item_exist("token_budget_bar"):
+            percentage = stats.get("percentage", 0.0)
+            dpg.set_value("token_budget_bar", percentage / 100.0 if percentage else 0.0)
+        if dpg.does_item_exist("token_budget_label"):
+            current = stats.get("current", 0)
+            limit = stats.get("limit", 0)
+            dpg.set_value("token_budget_label", f"{current:,} / {limit:,}")
+
     def _append_comms_entry(self, entry: dict, idx: int):
         if not dpg.does_item_exist("comms_scroll"):
             return
@@ -1870,6 +1881,11 @@ class App:
                 callback=self.cb_model_changed,
             )
             dpg.add_separator()
+            dpg.add_text("Telemetry")
+            dpg.add_text("History Token Budget:", color=_LABEL_COLOR)
+            dpg.add_progress_bar(tag="token_budget_bar", default_value=0.0, width=-1)
+            dpg.add_text("0 / 0", tag="token_budget_label")
+            dpg.add_separator()
             dpg.add_text("Parameters")
             dpg.add_input_float(tag="ai_temperature", label="Temperature", default_value=self.temperature, min_value=0.0, max_value=2.0)
             dpg.add_input_int(tag="ai_max_tokens", label="Max Tokens (Output)", default_value=self.max_tokens, step=1024)
@@ -2207,6 +2223,7 @@ class App:
 
             # Flush any comms entries queued from background threads
             self._flush_pending_comms()
+            self._update_telemetry_panel()
 
             dpg.render_dearpygui_frame()