Fix A() component

Replaced single `url` parameter with explicit `url_name` (URL pattern name resolved via `reverse()`) and `href` (literal path). Fixes:
- Silent fallback (typos like `"ad_puchase"` silently became broken links) → now raises `NoReverseMatch` at render time
- `type(url) is str` gate → removed (implicit dual-mode eliminated entirely)
- Callable parameter (`url: Callable`) dead code → removed
- Implicit dual-mode (`url="name"` vs `url=reverse("name")`) → `url_name` vs `href` are now mutually exclusive params
- Inconsistent type annotation mixing `Callable` with string default → cleaned up
- Added `ValueError` when both `url_name` and `href` are provided
- Updated all 10 call sites across 6 view files and internal callers (`LinkedPurchase()`, `NameWithIcon()`)

games/views/device.py

@@ -36,7 +36,7 @@ def list_devices(request: HttpRequest) -> HttpResponse:
             else None
         ),
         "data": {
-            "header_action": A([], Button([], "Add device"), url="add_device"),
+            "header_action": A([], Button([], "Add device"), url_name="add_device"),
             "columns": [
                 "Name",
                 "Type",