feat(ui): draw pane frames, page keys and a scroll thumb

beefy_player/app.py

@@ -76,6 +76,8 @@ class BeefyPlayerApp(App[None]):
         Binding("down,j", "cursor_down", "down", show=False),
         Binding("g", "cursor_top", "top", show=False),
         Binding("shift+g", "cursor_bottom", "bottom", show=False),
+        Binding("pageup", "page_up", "page up", show=False),
+        Binding("pagedown", "page_down", "page down", show=False),
         Binding("enter", "tune", "tune in"),
         Binding("space", "toggle_play", "play/pause"),
         Binding("s", "stop", "stop", show=False),
@@ -824,6 +826,19 @@ class BeefyPlayerApp(App[None]):
         self.index = min(len(self.view) - 1, self.index + 1)
         self.query_one(StationList).refresh()
 
+    def _page(self, delta: int) -> None:
+        if not self.view:
+            return
+        page = max(1, self.query_one(StationList).size.height - 1)
+        self.index = max(0, min(len(self.view) - 1, self.index + delta * page))
+        self.query_one(StationList).refresh()
+
+    def action_page_up(self) -> None:
+        self._page(-1)
+
+    def action_page_down(self) -> None:
+        self._page(1)
+
     def action_cursor_top(self) -> None:
         if not self.view:
             return