fix(permissions): admin can no longer operate tests — start/submit/edit/create, view only

Admin still bypassed require_any_role (non-strict) on the pure
operator actions: start-execution, submit-red, start-blue-work,
submit-blue, pause/resume-timer, and the red/blue field-edit + general
test create/update/remediation/import-rt/template endpoints all used
the loose dependency even where admin wasn't in the role tuple.
Switched every one of these to require_any_role_strict, matching the
review/validate/dispute/hold/assign endpoints already fixed earlier.

Frontend: removed every remaining role === "admin" disjunct gating
Start Execution, Submit to Blue Team, blue evaluating actions, timer
control, red/blue field editing, test creation, and template creation.
Team-blindness visibility (isBlind) deliberately keeps the admin
bypass — admin still sees both sides unmasked for oversight, since
that's visibility, not operating.

Updated ~20 tests whose fixtures used the admin account as a
convenience shortcut to create/drive tests through the workflow —
switched them to a red_lead account, fixing an incidental
fixture-resolution-order cookie bug along the way (client's cookie
jar prefers the last-logged-in role's cookie over any Bearer header
explicitly passed to a later request).

frontend/src/components/test-detail/TestDetailHeader.tsx

@@ -185,7 +185,7 @@ export default function TestDetailHeader({
     // Red Team in draft -> Start Execution
     if (
       test.state === "draft" &&
-      (role === "red_tech" || role === "red_lead" || role === "admin")
+      (role === "red_tech" || role === "red_lead")
     ) {
       buttons.push(
         <button
@@ -203,7 +203,7 @@ export default function TestDetailHeader({
     // Red Team in red_executing -> Submit to Blue Team (requires ≥1 red evidence)
     if (
       test.state === "red_executing" &&
-      (role === "red_tech" || role === "red_lead" || role === "admin")
+      (role === "red_tech" || role === "red_lead")
     ) {
       const hasRedEvidence = (test.red_evidences?.length ?? 0) > 0;
       buttons.push(
@@ -263,7 +263,7 @@ export default function TestDetailHeader({
     //   - if already picked up: show "Submit for Review" button
     if (
       test.state === "blue_evaluating" &&
-      (role === "blue_tech" || role === "blue_lead" || role === "admin")
+      (role === "blue_tech" || role === "blue_lead")
     ) {
       if (!test.blue_work_started_at) {
         buttons.push(
@@ -481,8 +481,8 @@ export default function TestDetailHeader({
   // ── Live timer ───────────────────────────────────────────────────
 
   const canControlTimer =
-    (test.state === "red_executing" && (role === "red_tech" || role === "red_lead" || role === "admin")) ||
-    (test.state === "blue_evaluating" && (role === "blue_tech" || role === "blue_lead" || role === "admin"));
+    (test.state === "red_executing" && (role === "red_tech" || role === "red_lead")) ||
+    (test.state === "blue_evaluating" && (role === "blue_tech" || role === "blue_lead"));
 
   const renderLiveTimer = () => {
     if (test.state === "red_executing" && test.red_started_at) {