Refactor insights handling and error encoding in presentation layer

- Updated insights analyzer tests to use Utc for date handling.
- Added timezone support for insights retrieval, allowing insights to be bucketed by the user's local time.
- Introduced `encode_domain_error` for better error handling in API responses.
- Modified various handlers to utilize the new error encoding function.
- Enhanced insights API to reject unknown time zones and return appropriate errors.
- Updated frontend components to handle insights data with timezone awareness.
- Improved localization for insights sample counts.

crates/application/src/insights/tests/get.rs

@@ -31,7 +31,9 @@ async fn returns_analyzer_output_for_the_user() {
         insights: InMemoryInsightsQuery::with_rows(user, rows),
     };
 
-    let insights = execute(&deps, UserId::from_uuid(user)).await.unwrap();
+    let insights = execute(&deps, UserId::from_uuid(user), &chrono::Utc)
+        .await
+        .unwrap();
     assert!(insights.iter().any(
         |i| matches!(i, domain::models::Insight::RatingLift { genre, .. } if genre == "Thriller")
     ));
@@ -49,7 +51,9 @@ async fn other_users_rows_are_not_seen() {
         insights: InMemoryInsightsQuery::with_rows(other, rows),
     };
 
-    let insights = execute(&deps, UserId::from_uuid(user)).await.unwrap();
+    let insights = execute(&deps, UserId::from_uuid(user), &chrono::Utc)
+        .await
+        .unwrap();
     assert!(insights.is_empty());
 }
 
@@ -60,7 +64,9 @@ async fn empty_diary_returns_empty_list() {
         insights: InMemoryInsightsQuery::new(),
     };
 
-    let insights = execute(&deps, UserId::from_uuid(user)).await.unwrap();
+    let insights = execute(&deps, UserId::from_uuid(user), &chrono::Utc)
+        .await
+        .unwrap();
     assert!(insights.is_empty());
 }
 
@@ -83,7 +89,7 @@ async fn port_errors_propagate() {
         insights: Arc::new(Failing),
     };
 
-    let err = execute(&deps, UserId::from_uuid(Uuid::new_v4()))
+    let err = execute(&deps, UserId::from_uuid(Uuid::new_v4()), &chrono::Utc)
         .await
         .unwrap_err();
     assert!(matches!(