Update JS and PY deps, misc tweaks (#33903)

- Update all updateable dependencies
- Add a few more unupgradable ones to updates blocklist
- Adapt to breaking changes
- Update to typescript 5.8, enable `erasableSyntaxOnly` which
necessitated a change because of forbidden syntax
- Misc cleanups
- Tested htmx, easymde, swagger, chart.js

tsconfig.json

@@ -18,8 +18,10 @@
     "allowJs": true,
     "allowSyntheticDefaultImports": true,
     "alwaysStrict": true,
+    "erasableSyntaxOnly": true,
     "esModuleInterop": true,
     "isolatedModules": true,
+    "libReplacement": false,
     "noEmit": true,
     "resolveJsonModule": true,
     "skipLibCheck": true,