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/base/Button.vue

@@ -11,6 +11,10 @@ const props = defineProps({
 		type: Boolean,
 		default: false,
 	},
+	download: {
+		type: String,
+		default: null,
+	},
 	action: {
 		type: Function,
 		default: null,
@@ -106,6 +110,7 @@ const classes = computed(() => {
 		class="btn"
 		:class="classes"
 		:href="disabled ? undefined : link"
+		:download="download || undefined"
 		:target="external ? '_blank' : '_self'"
 		@click="
 			(event) => {