huge refactor of the entire codebase, with the goal of improving maintainability, readability, and extensibility. This commit includes changes to almost every file in the project, including:

TUI/modalscreen/matrix_room_picker.py

@@ -8,6 +8,7 @@ from textual.screen import ModalScreen
 from textual.widgets import Static, Button, Checkbox, ListView, ListItem
 from textual import work
 from rich.text import Text
+from ProviderCore.registry import get_plugin
 import logging
 logger = logging.getLogger(__name__)
 
@@ -181,8 +182,9 @@ class MatrixRoomPicker(ModalScreen[List[str]]):
     @work(thread=True)
     def _load_rooms_background(self) -> None:
         try:
-            from Provider.matrix import Matrix
-            provider = Matrix(self.config)
+            provider = get_plugin("matrix", self.config)
+            if provider is None:
+                raise RuntimeError("Matrix plugin unavailable")
             rooms = provider.list_rooms()
             self.app.call_from_thread(self._apply_room_results, rooms, None)
         except Exception as exc: