spa hardening, offline logging, rate limit fixes

server:
- backup exporter, auth extractors, error shapes, CONTEXT (prior work)
- spa assets served outside the rate limit via route_layer
- requests_per_second went to per_second(), which takes an interval not a
  rate: 50 meant one request per 50s once burst was spent. now converted
  properly. 15/s, burst 60

spa fixes:
- account delete cleared snake_case token keys that were never written
- refresh interceptor could retry forever
- date ranges used local day boundaries stamped +00:00
- "all" period trend plotted one page; calendar days fabricated mood 3
- chart grid invisible: hsl(var(--border)) against rgba tokens
- blob url leak, orphaned media on failed save, devtools in prod bundle
- pt-safe/safe-area-pb classes never existed

spa features:
- offline outbox: entries queue to IndexedDB, replay with backoff, only
  server refusals count against an entry
- drafts persist, quick-log sheet, diary infinite scroll + filters
- route error boundary, stale-chunk recovery, no service worker in dev

a11y + perf:
- mood picker is a radiogroup, activity picker keyboard-operable,
  text alternatives for colour/emoji, locale week start
- dark glass over the bright photo: worst case 1.4:1 -> 4.9-9.6:1
- initial payload 1095->769kB raw, 306->230kB gzip; 38 unused components
  and 5 deps dropped; fonts 218->133kB

53 tests added (43 spa, 10 server)

crates/application/tests/entry/dimension_test.rs

@@ -1,6 +1,5 @@
 use std::sync::Arc;
 
-use domain::activity::ActivityId;
 use domain::attachment::{PhotoId, VoiceMemoId};
 use domain::dimension::{DimensionKind, DimensionValue};
 use domain::entry::{Mood, MoodEntry};
@@ -105,11 +104,16 @@ async fn an_entry_composes_every_kind_of_dimension_it_has() {
     let store = Arc::new(domain::testing::InMemoryStore::new());
     let user = test_user("erin");
 
-    let activity_id = ActivityId::generate();
+    let activity = domain::testing::test_activity(user.id().clone(), "reading");
+    domain::ports::ActivityCommandPort::save(store.as_ref(), &activity)
+        .await
+        .unwrap();
+    let activity_id = activity.id().clone();
     let photo_id = PhotoId::generate();
     let voice_memo_id = VoiceMemoId::generate();
 
     let deps = create_entry::Deps {
+        activities: store.clone(),
         entries: store.clone(),
         dimensions: dimensions.ports(),
         events: store.clone(),