fix(web): download archives via html POST forms (#30021)

* fix: download archives via html POST forms

* refactor: fix css of download panel, add translations and toasts

* style: run lint, formatter, check

* chore: generate open-api specs

* refactor(web): simplify download manager, use SvelteMap

* refactor(server): parse fields from x-www-form-urlencoded request

* refactor: move content-disposition to ImmichReadStream

* Pass asset ids as a comma-separated string

This fixes a bug where the 1000 parameter limit is being hit when
downloading 1000+ assets.

* Add download controller test

* Fix lint warnings

open-api/immich-openapi-specs.json

@@ -20799,6 +20799,10 @@
       },
       "DownloadArchiveDto": {
         "properties": {
+          "archiveName": {
+            "description": "The name of the archive to download, without extension",
+            "type": "string"
+          },
           "assetIds": {
             "description": "Asset IDs",
             "items": {