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/src/metric/use_cases/list_rejections.rs

@@ -0,0 +1,19 @@
+use std::sync::Arc;
+
+use domain::ports::RejectionQueryPort;
+use domain::rejection::RejectedMetric;
+use domain::user::UserId;
+
+use crate::errors::ApplicationError;
+
+pub struct Deps {
+    pub rejections: Arc<dyn RejectionQueryPort>,
+}
+
+#[tracing::instrument(skip(deps))]
+pub async fn execute(
+    user_id: UserId,
+    deps: &Deps,
+) -> Result<Vec<RejectedMetric>, ApplicationError> {
+    Ok(deps.rejections.find_recent_by_user(&user_id).await?)
+}

crates/application/src/metric/use_cases/mod.rs

@@ -1,2 +1,3 @@
 pub mod list_daily_metrics;
+pub mod list_rejections;
 pub mod set_daily_metrics;