Initial upload: DevDash CLI with TUI dashboard

src/ui/components/loading.py

@@ -0,0 +1,19 @@
+from textual.widgets import Static
+
+
+class LoadingSpinner(Static):
+    def __init__(self, **kwargs):
+        super().__init__("Loading...", **kwargs)
+        self._spinner_chars = "⠋⠙⠹⠸⠼⠴⠦⠧⠇⠏⠫⠽⠘⠰ ⠁⠂⠄⡀⢀⠠⠐⠈"
+        self._index = 0
+
+    async def on_mount(self) -> None:
+        self.update_timer = self.set_interval(0.1, self._spin)
+
+    def _spin(self) -> None:
+        self._index = (self._index + 1) % len(self._spinner_chars)
+        self.update(self._spinner_chars[self._index])
+
+    def on_unmount(self) -> None:
+        if hasattr(self, 'update_timer'):
+            self.update_timer.stop()