Add loading spinner to operation log during running tasks

Shows an animated spinner next to the title while backup, restore,
retention, remote test, and schedule operations are running. Spinner
hides when the operation completes via finish().

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tui/gniza.tcss

@@ -193,10 +193,21 @@ SelectionList {
     border: thick $accent;
 }
 
+#ol-header {
+    height: auto;
+    margin: 0 0 1 0;
+}
+
 #ol-title {
     text-style: bold;
     color: #00cc00;
-    margin: 0 0 1 0;
+    width: 1fr;
+}
+
+#ol-spinner {
+    width: auto;
+    min-width: 4;
+    height: 1;
 }
 
 #ol-log {

tui/screens/backup.py

@@ -77,6 +77,7 @@ class BackupScreen(Screen):
             log_screen.write("\n[green]Backup completed successfully.[/green]")
         else:
             log_screen.write(f"\n[red]Backup failed (exit code {rc}).[/red]")
+        log_screen.finish()
 
     @work
     async def _do_backup_all(self) -> None:
@@ -87,6 +88,7 @@ class BackupScreen(Screen):
             log_screen.write("\n[green]All backups completed.[/green]")
         else:
             log_screen.write(f"\n[red]Backup failed (exit code {rc}).[/red]")
+        log_screen.finish()
 
     def action_go_back(self) -> None:
         self.app.pop_screen()

tui/screens/remotes.py

@@ -94,6 +94,7 @@ class RemotesScreen(Screen):
             log_screen.write("\n[green]Connection test passed.[/green]")
         else:
             log_screen.write(f"\n[red]Connection test failed (exit code {rc}).[/red]")
+        log_screen.finish()
 
     def _delete_remote(self, name: str) -> None:
         conf = CONFIG_DIR / "remotes.d" / f"{name}.conf"

tui/screens/restore.py

@@ -122,6 +122,7 @@ class RestoreScreen(Screen):
             log_screen.write("\n[green]Restore completed successfully.[/green]")
         else:
             log_screen.write(f"\n[red]Restore failed (exit code {rc}).[/red]")
+        log_screen.finish()
 
     def action_go_back(self) -> None:
         self.app.pop_screen()

tui/screens/retention.py

@@ -75,6 +75,7 @@ class RetentionScreen(Screen):
             log_screen.write("\n[green]Cleanup completed.[/green]")
         else:
             log_screen.write(f"\n[red]Cleanup failed (exit code {rc}).[/red]")
+        log_screen.finish()
 
     @work
     async def _do_cleanup_all(self) -> None:
@@ -85,6 +86,7 @@ class RetentionScreen(Screen):
             log_screen.write("\n[green]All cleanups completed.[/green]")
         else:
             log_screen.write(f"\n[red]Cleanup failed (exit code {rc}).[/red]")
+        log_screen.finish()
 
     def action_go_back(self) -> None:
         self.app.pop_screen()

tui/screens/schedule.py

@@ -225,6 +225,7 @@ class ScheduleScreen(Screen):
             log_screen.write(stdout)
         if stderr:
             log_screen.write(stderr)
+        log_screen.finish()
 
     @work
     async def _remove_schedules(self) -> None:
@@ -235,6 +236,7 @@ class ScheduleScreen(Screen):
             log_screen.write(stdout)
         if stderr:
             log_screen.write(stderr)
+        log_screen.finish()
 
     @work
     async def _show_crontab(self) -> None:
@@ -245,6 +247,7 @@ class ScheduleScreen(Screen):
             log_screen.write(stdout)
         if stderr:
             log_screen.write(stderr)
+        log_screen.finish()
 
     def action_go_back(self) -> None:
         self.app.pop_screen()

tui/widgets/operation_log.py

@@ -3,8 +3,8 @@ import asyncio
 from rich.text import Text
 from textual.app import ComposeResult
 from textual.screen import ModalScreen
-from textual.widgets import RichLog, Button, Static
+from textual.widgets import RichLog, Button, Static, LoadingIndicator
-from textual.containers import Vertical
+from textual.containers import Vertical, Horizontal
 
 
 class OperationLog(ModalScreen[None]):
@@ -16,10 +16,13 @@ class OperationLog(ModalScreen[None]):
         self._title = title
         self._mounted_event = asyncio.Event()
         self._buffer: list[str] = []
+        self._running = True
 
     def compose(self) -> ComposeResult:
         with Vertical(id="op-log"):
-            yield Static(self._title, id="ol-title")
+            with Horizontal(id="ol-header"):
+                yield Static(self._title, id="ol-title")
+                yield LoadingIndicator(id="ol-spinner")
             yield RichLog(id="ol-log", wrap=True, highlight=True, markup=True)
             yield Button("Close", variant="primary", id="ol-close")
 
@@ -43,6 +46,13 @@ class OperationLog(ModalScreen[None]):
         else:
             log.write(text)
 
+    def finish(self) -> None:
+        self._running = False
+        try:
+            self.query_one("#ol-spinner", LoadingIndicator).display = False
+        except Exception:
+            pass
+
     def write(self, text: str) -> None:
         if not self._mounted_event.is_set():
             self._buffer.append(text)