Update textual to 0.31.0

DataTable now has `max-height: 100%` by default, which breaks my layout.

requirements.txt

@@ -8,7 +8,7 @@ pyperclip==1.8.2
 pyxdg==0.28 # xdg module, used for wallpaper setting; optional, falls back to ~/.config
 rich==13.3.5
 stransi==0.3.0
-textual==0.30.0
+textual==0.31.0
 textual-dev==1.0.0 # for development (`textual` CLI)
 watchdog==3.0.0 # for development; optional (only used when --restart-on-changes is passed)
 types-Pillow==10.0.0.1 # for development

src/textual_paint/paint.css

@@ -262,6 +262,9 @@ FileDialogWindow .window_content Button {
 
 CharacterSelectorDialogWindow DataTable {
     width: auto;
+    /* textual 0.31.0 adds `max-height: 100%` to DataTable */
+    /* `unset` is not supported */
+    max-height: 10000;
 }
 CharacterSelectorDialogWindow .ok,
 CharacterSelectorDialogWindow .cancel {

src/textual_paint/paint.py

@@ -1447,7 +1447,7 @@ Columns: {len(self.palette) // 2}
         """Center the image as the wallpaper."""
         self.set_as_wallpaper(tiled=False)
     # worker thread helps keep the UI responsive
-    @work(exclusive=True)
+    @work(exclusive=True, thread=True)
     def set_as_wallpaper(self, tiled: bool) -> None:
         """Set the image as the wallpaper."""
         try: