Add hamster tag management, reinstate tags during import, reorganise

code

hamstertools/screens/hamster/__init__.py

@@ -0,0 +1,42 @@
+from textual.app import ComposeResult
+from textual.screen import Screen
+from textual.widgets import (
+    Header,
+    Footer,
+    TabbedContent,
+    TabPane,
+)
+
+from .activities import ActivityList
+from .categories import CategoryList
+from .tags import TagList
+
+
+class HamsterScreen(Screen):
+    BINDINGS = [
+        ("c", "show_tab('categories')", "Categories"),
+        ("a", "show_tab('activities')", "Activities"),
+        ("t", "show_tab('tags')", "Tags"),
+    ]
+
+    SUB_TITLE = "Hamster"
+
+    def compose(self) -> ComposeResult:
+        yield Header()
+        with TabbedContent(initial="activities"):
+            with TabPane("Categories", id="categories"):
+                yield CategoryList()
+            with TabPane("Activities", id="activities"):
+                yield ActivityList()
+            with TabPane("Tags", id="tags"):
+                yield TagList()
+        yield Footer()
+
+    def on_mount(self) -> None:
+        self.query_one("TabbedContent Tabs").can_focus = False
+        self.query_one("#activities DataTable").focus()
+
+    def action_show_tab(self, tab: str) -> None:
+        """Switch to a new tab."""
+        self.get_child_by_type(TabbedContent).active = tab
+        self.query_one(f"#{tab} DataTable").focus()