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/features/message-search/useMessageSearch.ts

@@ -174,8 +174,7 @@ export const useMessageSearch = (params: MessageSearchParams) => {
               // date range is instead enforced client-side (see filterGroupsByDateRange).
               // contains_url is a valid spec field not yet in SDK types.
               ...(containsUrl !== undefined && { contains_url: containsUrl }),
-              // eslint-disable-next-line @typescript-eslint/no-explicit-any
-            } as any,
+            },
             include_state: false,
             order_by: order as SearchOrderBy.Recent,
             search_term: term,