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/domain/tests/api_token/api_token_test.rs

@@ -1,12 +1,17 @@
-use domain::api_token::{ApiToken, MintedApiToken, TokenDigest, TokenScope};
+use domain::api_token::{ApiToken, MintedApiToken, TokenDigest, TokenScope, TokenScopes};
 use domain::provider::ProviderName;
 use domain::user::UserId;
 
 fn a_token() -> ApiToken {
+    token_granting([TokenScope::WriteMetrics])
+}
+
+fn token_granting(scopes: impl IntoIterator<Item = TokenScope>) -> ApiToken {
     ApiToken::new(
         UserId::generate(),
         ProviderName::new("iphone-shortcuts").unwrap(),
         TokenDigest::from_persistence("digest-of-the-secret".into()),
+        TokenScopes::new(scopes).unwrap(),
     )
 }
 
@@ -15,7 +20,7 @@ fn a_fresh_token_has_never_been_used() {
     let token = a_token();
 
     assert!(token.last_used_at().is_none());
-    assert_eq!(token.scope(), TokenScope::WriteMetrics);
+    assert!(token.allows(TokenScope::WriteMetrics));
 }
 
 #[test]
@@ -36,13 +41,58 @@ fn the_name_a_token_carries_is_the_provider_its_writes_are_attributed_to() {
 
 #[test]
 fn every_scope_survives_a_round_trip_through_its_name() {
-    assert_eq!(
-        TokenScope::from_name(TokenScope::WriteMetrics.name()),
-        Some(TokenScope::WriteMetrics)
-    );
+    for scope in TokenScope::ALL {
+        assert_eq!(TokenScope::from_name(scope.name()), Some(scope));
+    }
+
     assert_eq!(TokenScope::from_name("read-everything"), None);
 }
 
+#[test]
+fn a_token_grants_only_what_it_was_minted_for() {
+    let token = token_granting([TokenScope::ReadJournal]);
+
+    assert!(token.allows(TokenScope::ReadJournal));
+    assert!(!token.allows(TokenScope::WriteJournal));
+    assert!(!token.allows(TokenScope::WriteMetrics));
+    assert!(!token.allows(TokenScope::ReadProfile));
+}
+
+#[test]
+fn a_token_that_grants_nothing_cannot_be_minted() {
+    assert!(TokenScopes::new([]).is_err());
+    assert!(TokenScopes::from_names(Vec::<&str>::new()).is_err());
+}
+
+#[test]
+fn an_unknown_scope_name_is_refused_rather_than_ignored() {
+    let refused = TokenScopes::from_names(["readJournal", "readEverything"]);
+
+    assert!(
+        refused.is_err(),
+        "a typo must not quietly mint a narrower token than asked for"
+    );
+}
+
+#[test]
+fn scopes_survive_a_round_trip_through_persistence() {
+    let held = TokenScopes::new([TokenScope::ReadJournal, TokenScope::WriteJournal]).unwrap();
+
+    assert_eq!(
+        TokenScopes::from_persistence(&held.to_persistence()),
+        Some(held)
+    );
+}
+
+#[test]
+fn a_stored_scope_this_build_cannot_read_makes_the_whole_set_unreadable() {
+    assert_eq!(
+        TokenScopes::from_persistence("readJournal writeEverything"),
+        None
+    );
+    assert_eq!(TokenScopes::from_persistence(""), None);
+}
+
 #[test]
 fn a_minted_token_keeps_the_secret_out_of_its_debug_output() {
     let minted = MintedApiToken::new(a_token(), "kmood_supersecretvalue".into());