fix: Prevent tooltip from stealing focus and closing modal dialog

- Removed dpg.focus_item() call that was stealing focus
- Added no_bring_to_front_on_focus=True to prevent focus stealing
- Removed no_open_over_existing_popup parameter

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/discussions/ui/gui.py

@@ -499,7 +499,7 @@ class DiscussionGUI:
         self._tooltip_alpha = 1.0
         self._tooltip_last_mouse_pos = mouse_pos
 
-        # Create tooltip as a popup window (appears above modal)
+        # Create tooltip as a non-modal, non-focusable window
         with dpg.window(
             tag="dictate_tooltip_window",
             no_title_bar=True,
@@ -509,9 +509,9 @@ class DiscussionGUI:
             no_collapse=True,
             no_background=False,
             no_focus_on_appearing=True,
+            no_bring_to_front_on_focus=True,
             pos=[tooltip_x, tooltip_y],
-            autosize=True,
-            no_open_over_existing_popup=False
+            autosize=True
         ):
             dpg.add_text("Voice Dictation", color=(200, 200, 255))
             dpg.add_separator()
@@ -526,9 +526,6 @@ class DiscussionGUI:
             dpg.add_text("Tip: Type at insertion point first", color=(255, 200, 100))
             dpg.add_text("to set cursor position.", color=(255, 200, 100))
 
-        # Bring tooltip to front
-        dpg.focus_item("dictate_tooltip_window")
-
     def _hide_dictate_tooltip(self):
         """Hide the custom dictate button tooltip immediately."""
         if dpg.does_item_exist("dictate_tooltip_window"):