fix: 4 improvements — campaign test deletion, review queue triggers, technique link, Jira read-only

1. Campaign test deletion: removing a test from a campaign now also
   deletes the underlying Test record and recalculates technique status.

2. Review Queue triggers: review_required=True is now also set when
   - Sigma/Elastic detection rules are imported for a technique
   - A test is validated (coverage status changes)

3. Test detail — Technique link: 'Technique' entry added at the top of
   the Details sidebar showing MITRE ID + name as a clickable link to
   /techniques/{mitre_id}.

4. Jira panel — read-only on test page: added readOnly + label props to
   JiraLinkPanel. TestDetailPage now passes readOnly=true and the test
   name as label, hiding Link Issue / Sync / Unlink controls (automatic
   Jira creation only — no manual management).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/app/routers/tests.py

@@ -508,6 +508,9 @@ def validate_red(
         )
         if test.state in (TestState.validated, TestState.rejected):
             recalculate_technique_status(db, test.technique)
+            # Flag technique for review — coverage changed
+            if test.technique:
+                test.technique.review_required = True
         uow.commit()
     db.refresh(test)
     if test.state == TestState.validated:
@@ -539,6 +542,9 @@ def validate_blue(
         )
         if test.state in (TestState.validated, TestState.rejected):
             recalculate_technique_status(db, test.technique)
+            # Flag technique for review — coverage changed
+            if test.technique:
+                test.technique.review_required = True
         uow.commit()
     db.refresh(test)
     if test.state == TestState.validated: