Fix journey cluster defects + UX improvements across 7 clusters

P0 fixes (clean-start + route contracts):
- VexHub: fix migration 002 table name + add repair migration 003
- Gateway: add /console/admin and /api/v1/unknowns routes
- IDP: add platform.idp.admin scope to OAuth client + web config
- Risk: fix URL construction from authority to gateway base
- Unknowns: fix client path from /api/v1/scanner/unknowns to /api/v1/unknowns

P1 fixes (trust + shell integrity):
- Audit: fix module name normalization, add Authority audit source
- Stage: add persistence across web store, API contracts, DB migration 059
- Posture: add per-source error tracking + degradation banner

P2 fixes (adoption + workflow clarity):
- Rename Triage to Findings in navigation + breadcrumbs
- Command palette: show quick actions for plain text queries, fix scan routes
- Scan: add local-mode limitation messaging + queue hints
- Release: add post-seal promotion CTA with pre-filled release ID
- Welcome: rewrite around operator adoption model (Get Started + What Stella Replaces)

UX improvements:
- Status rail: convert to icon-only with color state + tooltips
- Event Stream Monitor: new page at /ops/operations/event-stream
- Sidebar: collapse Operations by default
- User menu: embed theme switcher (Day/Night/System), remove standalone toggle
- Settings: add Profile section with email editing + PUT /api/v1/platform/preferences/email endpoint
- Docs viewer: replace custom parser with ngx-markdown (marked) for proper table/code/blockquote rendering

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/Web/StellaOps.Web/package.json

@@ -42,8 +42,10 @@
     "@angular/router": "^21.1.2",
     "@viz-js/viz": "^3.24.0",
     "d3": "^7.9.0",
-    "mermaid": "^11.12.2",
+    "marked": "^17.0.4",
+    "mermaid": "^11.13.0",
     "monaco-editor": "0.52.0",
+    "ngx-markdown": "^21.1.0",
     "rxjs": "~7.8.0",
     "tslib": "^2.3.0",
     "yaml": "^2.4.2",