Merge commit '4896d2c4c6d3bd6b878c5a075b6611c65d4203b2' into glitch-soc/merge-upstream

Conflicts:
- `app/views/settings/preferences/appearance/show.html.haml`:
  Upstream changed stuff too close to glitch-soc's theming system changes.
  Applied upstream's changes.
- `streaming/index.js`:
  Upstream refactored a bunch of stuff where our code was different due to
  local-only posts.
  Applied upstream's changes while taking care of local-only posts.

vite.config.mts

@@ -73,7 +73,6 @@ export const config: UserConfigFnPromise = async ({ mode, command }) => {
       port: 3036,
     },
     build: {
-      target: 'modules',
       commonjsOptions: { transformMixedEsModules: true },
       chunkSizeWarningLimit: 1 * 1024 * 1024, // 1MB
       sourcemap: true,