Bump Docker base images to node 22; mock firestore comment cleanup

Both Dockerfiles (root firebase-mode + docker/ caddy) bumped node:18-alpine
to node:22-alpine. better-sqlite3 v12 (from PR #6) requires node 20+; node 18
builds fail with node-gyp/python errors. openssl-legacy-provider flag kept
for react-scripts 5 compat.

.dockerignore: removed .env* exclusion so .env.local COPY works in firebase
image build.

mock firestore applyConstraints comment: offset handled by adapter (firebase.js
slices), mock never sees it — clarified dead-code reasoning.

TODO.md

@@ -10,6 +10,9 @@ Backlog of bugs + long-term items. Milestones live in REWORK_PLAN.md.
 not sure good way to do this
 
 
+### npm install warnings cleanup pass
+lots of updates
+
 
 
 ### TEST GAP: current branch changes need focused coverage