Unify CCS case management flow

api/QuestionsApi/Controllers/CcsController.cs

@@ -27,6 +27,13 @@ public sealed class CcsController(CcsStore store, CcsRatingStore ratings) : Cont
         catch (InvalidOperationException exception) { return Conflict(exception.Message); }
     }
 
+    [HttpGet("active")]
+    public async Task<IActionResult> Active()
+    {
+        var attempt = await store.FindActiveAsync(UserId());
+        return attempt is null ? NoContent() : Ok(await store.ToResponseAsync(attempt));
+    }
+
     [HttpGet("attempts/{id}")]
     public async Task<IActionResult> Attempt(string id)
     {
@@ -54,7 +61,15 @@ public sealed class CcsController(CcsStore store, CcsRatingStore ratings) : Cont
     }
 
     [HttpGet("history")]
-    public async Task<IActionResult> History([FromQuery] int limit = 50) => Ok(await store.HistoryAsync(UserId(), limit));
+    public async Task<IActionResult> History(
+        [FromQuery] int limit = 20,
+        [FromQuery] string status = "all",
+        [FromQuery] string sort = "newest",
+        [FromQuery] string? cursor = null)
+    {
+        try { return Ok(await store.HistoryAsync(UserId(), limit, status, sort, cursor)); }
+        catch (ArgumentException exception) { return BadRequest(exception.Message); }
+    }
 
     [HttpGet("prediction")]
     public async Task<IActionResult> Prediction() => Ok(await store.PredictionAsync(UserId()));