fix: skins QA problems + flow change (#6216)

* fix: skins backend bugs + apply flow

* fix: caching structure

* feat: collapse already duplicated skins + fix moj api spam

* fix: doc

* fix: flatten migrations

* feat: remove default cape/cape override concept

* fix: fmt + lint

* feat: remove SelectCapeModal for inline cape list

* feat: qa

* feat: virtualisation of skins sections + fix texture/model cache

* fix: lint

* fix: virt bugs + renderer fixes

* fix: qa bugs

* fix: doc

* fix: re-add click impulse anim from prototypes + re-add interact anim length cap

* fix: regressions

* devex: split up SkinPreviewrenderer

* fix: lint

* fix: introduce dynamic mode in virtual-scroll.ts

* feat: qa

* fix: nametag bug + remove minecon skin pack suffix

* feat: pain (literally)

* feat: user agent on moj reqs

* feat: impl per account flush queue for operations

* fix: breadcrumb

* chore: i18n pass

* fix: lint + prep + check

* fix: misalignments

packages/app-lib/migrations/20260526120000_fix-skin-selector-identity.sql

@@ -0,0 +1,13 @@
+DROP TABLE IF EXISTS default_minecraft_capes;
+
+-- Keep only one saved skin per Minecraft account and texture.
+-- variant and cape_id are settings on that saved skin, not part of the skin identity.
+DELETE FROM custom_minecraft_skins
+WHERE rowid NOT IN (
+    SELECT MAX(rowid)
+    FROM custom_minecraft_skins
+    GROUP BY minecraft_user_uuid, texture_key
+);
+
+CREATE UNIQUE INDEX custom_minecraft_skins_one_per_texture
+    ON custom_minecraft_skins (minecraft_user_uuid, texture_key);