refactor(types): drop 127 unnecessary as any casts (#210)

Removed every `as any` in src/, then restored only the ones tsc still
needs: 163 → 36. 112 were in lotus-terminal.css.ts (`'… !important' as
any` etc. — vanilla-extract's style types accept these strings as-is),
so its file-wide eslint-disable goes too. The casts were type-only, so
emitted code and generated CSS are unchanged.

eslint warnings 49 → 46; the ratchet is tightened to match.
tsc clean; 1202 unit tests pass.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PPmy3tPq869XDW4njjVaKA

src/app/pages/client/ClientRoot.tsx

@@ -291,7 +291,7 @@ export function ClientRoot({ children }: ClientRootProps) {
                         Failed to sync with your homeserver. Check your connection and try again.
                       </Text>
                     )}
-                  {('error' in loadState ? (loadState as any).error?.message : undefined) !==
+                  {('error' in loadState ? loadState.error?.message : undefined) !==
                     IDB_VERSION_CONFLICT && (
                     <Button variant="Critical" onClick={mx ? () => startMatrix(mx) : loadMatrix}>
                       <Text as="span" size="B400">