Milestones 0 and 1: foundation and money in (20261007.10)

Foundation: single arm64 container (Hono + SQLite via Drizzle, React + Vite),
local sign-in with long-lived sessions and passkeys, roles (read-only, full
access, admin), nightly and pre-upgrade backups, light and dark themes,
date-based version numbers, and the ideas lightbulb behind IDEAS_ENABLED.

Money in: accounts with balances, CSV import with bank detection, a column
mapping pop-up for unknown layouts, duplicate checks, transfer pairing and
undo; one-tap review with learned rules; activity with search, splits, tags,
notes and cash entries. Statement files are blocked from commits by a
pre-commit hook; tests use synthetic fixtures only.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

web/src/lib/useMediaQuery.ts

@@ -0,0 +1,15 @@
+import { useSyncExternalStore } from 'react';
+
+export function useMediaQuery(query: string): boolean {
+  return useSyncExternalStore(
+    (onChange) => {
+      const list = window.matchMedia(query);
+      list.addEventListener('change', onChange);
+      return () => list.removeEventListener('change', onChange);
+    },
+    () => window.matchMedia(query).matches,
+  );
+}
+
+/** Phones get bottom sheets and big targets; larger screens get popovers. */
+export const useIsPhone = () => !useMediaQuery('(min-width: 640px)');