fix(ui): use the full page width and fit phone screens

The page no longer caps its width. On very wide screens the attention list shows two columns of projects.

On phones the header, the health strip and the filter chips wrap or scroll inside their own box, and each item shows its age under the text. The side panel scrolls on its own.

src/components/AttentionList.vue

@@ -43,7 +43,7 @@ defineExpose({ focusSearch: () => bar.value?.focus() })
       <FontAwesomeIcon :icon="faCircleCheck" class="text-ok text-xl" aria-hidden="true" />
       Nothing matches the current filters.
     </div>
-    <div v-else class="flex flex-col gap-4">
+    <div v-else class="grid grid-cols-[minmax(0,1fr)] items-start gap-4 2xl:grid-cols-2">
       <RepoGroup
         v-for="block in blocks"
         :key="block.repo.fullName"