feat(frontend): add technique/platform/outcome/date filters to Validated Tests

The "200" badge on the Validated Tests page was a hardcoded query limit,
not the real total — silently hiding results beyond the 200th once there
were more validated tests than that. Now shows the true total via the new
/tests/count endpoint, and warns when the fetched page doesn't cover all
matches.

Adds filter controls beyond the existing name/technique text search:
technique (MITRE ID or name), platform, attack outcome, detection
outcome, and a validated-date range — all pushed down to the server via
the new GET /tests filters instead of only ever searching the current
page client-side.

frontend/src/api/tests.ts

@@ -67,12 +67,19 @@ export interface TestValidatePayload {
 export interface TestListFilters {
   state?: TestState;
   technique_id?: string;
+  /** Free-text filter on technique MITRE ID or name — doesn't require knowing the technique's UUID. */
+  technique_search?: string;
   platform?: string;
   created_by?: string;
   pending_validation_side?: "red" | "blue";
   /** "My reviews" queue — tests assigned to this reviewer at the red_review/blue_review gate. */
   reviewer_id?: string;
   not_in_any_campaign?: boolean;
+  attack_success?: AttackSuccessResult;
+  detection_result?: TestResult;
+  /** ISO date/datetime — filters on whichever lead validated last. */
+  validated_from?: string;
+  validated_to?: string;
   assigned_to_me?: boolean;
   unassigned_red?: boolean;
   unassigned_blue?: boolean;
@@ -80,18 +87,28 @@ export interface TestListFilters {
   limit?: number;
 }
 
-// ── CRUD ───────────────────────────────────────────────────────────
-
-/** List tests with optional filters. */
-export async function getTests(filters?: TestListFilters): Promise<Test[]> {
+function buildTestListParams(filters?: TestListFilters): URLSearchParams {
   const params = new URLSearchParams();
   if (filters?.state) params.append("state", filters.state);
   if (filters?.technique_id) params.append("technique_id", filters.technique_id);
+  if (filters?.technique_search) params.append("technique_search", filters.technique_search);
   if (filters?.platform) params.append("platform", filters.platform);
   if (filters?.created_by) params.append("created_by", filters.created_by);
   if (filters?.pending_validation_side) params.append("pending_validation_side", filters.pending_validation_side);
   if (filters?.reviewer_id) params.append("reviewer_id", filters.reviewer_id);
   if (filters?.not_in_any_campaign) params.append("not_in_any_campaign", "true");
+  if (filters?.attack_success) params.append("attack_success", filters.attack_success);
+  if (filters?.detection_result) params.append("detection_result", filters.detection_result);
+  if (filters?.validated_from) params.append("validated_from", filters.validated_from);
+  if (filters?.validated_to) params.append("validated_to", filters.validated_to);
+  return params;
+}
+
+// ── CRUD ───────────────────────────────────────────────────────────
+
+/** List tests with optional filters. */
+export async function getTests(filters?: TestListFilters): Promise<Test[]> {
+  const params = buildTestListParams(filters);
   if (filters?.offset !== undefined) params.append("offset", String(filters.offset));
   if (filters?.limit !== undefined) params.append("limit", String(filters.limit));
 
@@ -101,6 +118,15 @@ export async function getTests(filters?: TestListFilters): Promise<Test[]> {
   return data;
 }
 
+/** Return the true total of tests matching the given filters (unaffected by pagination limits). */
+export async function getTestsCount(filters?: TestListFilters): Promise<number> {
+  const params = buildTestListParams(filters);
+  const { data } = await client.get<{ total: number }>(
+    `/tests/count${params.toString() ? `?${params}` : ""}`,
+  );
+  return data.total;
+}
+
 /** Create a new test. */
 export async function createTest(payload: TestCreatePayload): Promise<Test> {
   const { data } = await client.post<Test>("/tests", payload);