fix(ui): use DEFAULT_CSS with selectors in detail screens

- Replace inline CSS string with DEFAULT_CSS class attribute
- Add proper Textual CSS selectors (ScreenName, #toolbar, DataTable)
- Remove invalid align at root level

full_updater/ui/detail_screens.py

@@ -9,24 +9,22 @@ except Exception:
     PYPERCLIP_OK = False
 
 
-SCREEN_CSS = """
+class PackageListScreen(Screen):
+    BINDINGS = [("b", "back", "Retour")]
+    DEFAULT_CSS = """
+    PackageListScreen {
         align: left top;
         padding: 1 2;
-    #toolbar {
+    }
+    PackageListScreen #toolbar {
         height: auto;
-        dock: top;
         margin-bottom: 1;
     }
-    DataTable {
+    PackageListScreen DataTable {
         height: 1fr;
         border: solid $primary;
     }
-"""
-
-
-class PackageListScreen(Screen):
-    BINDINGS = [("b", "back", "Retour")]
-    CSS = SCREEN_CSS
+    """
 
     def __init__(self, packages: list[dict]):
         super().__init__()
@@ -52,7 +50,20 @@ class PackageListScreen(Screen):
 
 class CVEListScreen(Screen):
     BINDINGS = [("b", "back", "Retour")]
-    CSS = SCREEN_CSS
+    DEFAULT_CSS = """
+    CVEListScreen {
+        align: left top;
+        padding: 1 2;
+    }
+    CVEListScreen #toolbar {
+        height: auto;
+        margin-bottom: 1;
+    }
+    CVEListScreen DataTable {
+        height: 1fr;
+        border: solid $primary;
+    }
+    """
 
     def __init__(self, cves: list[dict]):
         super().__init__()