Fix unload lifecycle, widget cleanup, and plugin removal handling

- Rename GodotHandler to GDScriptHandler in LSP client
- Fix unload() method naming in nanoesq_temp_buffer plugin
- Return manifest_meta in manifest_manager for manual launch plugins
- Properly destroy tabs_widget, viewport, and scrolled_win on unload
- Refactor plugin removal to search all manifest lists and fix cleanup order
- Fix widget reference in plugins_ui (use child instead of box)

src/plugins/manifest_manager.py

@@ -56,7 +56,7 @@ class ManifestManager:
 
             if not manifest.autoload:
                 self.manual_launch_manifests.append(manifest_meta)
-                return
+                return manifest_meta
 
             if manifest.pre_launch:
                 self.pre_launch_manifests.append(manifest_meta)

src/plugins/plugin_reload_mixin.py

@@ -48,13 +48,13 @@ class PluginReloadMixin:
 
     def remove_plugin(self, file: str) -> None:
         logger.info(f"Removing plugin: {file.get_uri()}")
-        for manifest_meta in self._plugin_collection[:]:
-            if not manifest_meta.folder in file.get_uri(): continue
 
-            manifest_meta.instance.unload()
-            manifest_meta.instance = None
-            self._plugin_collection.remove(manifest_meta)
-            self.plugins_ui.remove_row(manifest_meta)
+        manifests = self._manifest_manager.pre_launch_manifests    \
+                    + self._manifest_manager.post_launch_manifests \
+                    + self._manifest_manager.manual_launch_manifests
+
+        for manifest_meta in manifests:
+            if not manifest_meta.folder in file.get_uri(): continue
 
             if manifest_meta in self._manifest_manager.pre_launch_manifests:
                 self._manifest_manager.pre_launch_manifests.remove(manifest_meta)
@@ -63,4 +63,15 @@ class PluginReloadMixin:
             elif manifest_meta in self._manifest_manager.manual_launch_manifests:
                 self._manifest_manager.manual_launch_manifests.remove(manifest_meta)
 
+            self.plugins_ui.remove_row(manifest_meta)
+            break
+
+        del manifests
+        for manifest_meta in self._plugin_collection[:]:
+            if not manifest_meta.folder in file.get_uri(): continue
+
+            manifest_meta.instance.unload()
+            manifest_meta.instance = None
+            self._plugin_collection.remove(manifest_meta)
+
             break

src/plugins/plugins_ui.py

@@ -76,6 +76,7 @@ class PluginsUI(Gtk.Dialog):
 
         toggle_bttn.toggle_id = \
             toggle_bttn.connect("toggled", callback, manifest_meta)
+        box.toggle_bttn = toggle_bttn
 
         box.add(plugin_lbl)
         box.add(author_lbl)
@@ -96,5 +97,5 @@ class PluginsUI(Gtk.Dialog):
             toggle_bttn.disconnect(toggle_bttn.toggle_id)
 
             self.list_box.remove(row)
-            box.destroy()
+            child.destroy()
             break