fix(TASK-31): Sticky nav header for Apps + Marketplace

My Apps/App Store/Services tabs, category filters, and search bar
now stay fixed at the top on scroll using sticky positioning with
glass-blur background. Applied to both Apps.vue and Marketplace.vue
desktop views.

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

docs/MASTER_PLAN.md

@@ -42,6 +42,17 @@
 | **TASK-36** | **Cleaner iframe error screen with remediation** | **P2** | PLANNED | - |
 | **BUG-37** | **Apps flicker Start/Launch during container scan** | **P2** | PLANNED | - |
 | **TASK-38** | **Add blockchain sync info to homepage System card** | **P2** | PLANNED | - |
+| **BUG-1** | **Random logout / CSRF mismatch** | **P0** | PLANNED | - |
+| **FEATURE-4** | **Onboarding loading screen with progress** | **P1** | IN PROGRESS | - |
+| **BUG-3** | **IndeedHub WebSocket spam in console** | **P2** | PLANNED | - |
+| **TASK-8** | **Security hardening (CRIT-01, CRIT-02, HIGHs)** | **P0** | PLANNED | - |
+| **TASK-9** | **Full feature testing sweep** | **P1** | PLANNED | - |
+| **TASK-10** | **ISO build verification + multi-hardware test** | **P1** | PLANNED | - |
+| **TASK-11** | **Rootless podman + restore security hardening** | **P1** | ~~DONE~~ | - |
+| **TASK-12** | **Beta telemetry — node reporting + monitoring panel** | **P1** | PLANNED | - |
+| **TASK-17** | **Alpha version tags + rollback strategy** | **P2** | PLANNED | - |
+| **BUG-18** | **Fedimint Gateway iframe/tab UI doesn't load** | **P1** | PLANNED | - |
+| **BUG-19** | **Wrong IndeedHub splash (needs "Studio" version)** | **P1** | PLANNED | - |
 
 ### Phase 2: User Testing (controlled, real hardware)