fix: add download attribute to fix JAR files saving as ZIP in Chromium (#6065)

* fix: add download attribute to fix JAR files saving as ZIP in Chromium

- JAR files were downloading with a `.zip` extension in Chromium-based browsers (Chrome, Edge, Arc, Brave, Opera, Vivaldi)
- Root cause: JAR files are ZIP archives internally, so Chromium sniffs the `Content-Type` as `application/zip` and overrides the filename extension when no `download` attribute is present
- Fix: add `download="<filename>"` to all file download `<a>` tags so the browser uses the original filename from the API

* fix: add download attribute to remaining download links

Missed in initial pass: changelog page button, versions overflow
menu, settings/versions overflow menu. Also adds `download` prop
to Button and OverflowMenu to support dropdown link items.

Adds missing `getPrimaryFile` definition in changelog.vue.

---------

Co-authored-by: Mr_chank <180248271+chank-op@users.noreply.github.com>
Co-authored-by: Prospector <6166773+Prospector@users.noreply.github.com>

packages/ui/src/components/version/VersionSummary.vue

@@ -12,7 +12,12 @@
 			</p>
 		</div>
 		<ButtonStyled color="brand">
-			<a :href="downloadUrl" class="min-w-0" @click="emit('onDownload')">
+			<a
+				:href="downloadUrl"
+				:download="primaryFilename"
+				class="min-w-0"
+				@click="emit('onDownload')"
+			>
 				<DownloadIcon aria-hidden="true" /> Download
 			</a>
 		</ButtonStyled>
@@ -42,12 +47,17 @@ const props = defineProps<{
 	decorateDownloadUrl?: (url: string) => string
 }>()
 
+const primaryFile = computed<VersionFile>(
+	() => props.version.files.find((x) => x.primary) || props.version.files[0],
+)
+
 const downloadUrl = computed(() => {
-	const primary: VersionFile = props.version.files.find((x) => x.primary) || props.version.files[0]
-	const raw = primary.url
+	const raw = primaryFile.value.url
 	return props.decorateDownloadUrl ? props.decorateDownloadUrl(raw) : raw
 })
 
+const primaryFilename = computed(() => primaryFile.value.filename)
+
 const emit = defineEmits<{
 	onDownload: []
 	onNavigate: [url: string]