docs(quick-4): complete quick task 4 plan

- Add port 9999 as remote HD display mode
- Implement dual-mode default startup (8888 + 9999)
- Update all documentation with new mode and behavior

.planning/STATE.md

@@ -105,15 +105,16 @@ None - ready to begin Phase 1 planning.
 | 1 | Create start.sh script with menu for test, dev, etc. | 2026-03-13 | b474f70 | [1-create-start-sh-script-with-menu-for-tes](./quick/1-create-start-sh-script-with-menu-for-tes/) |
 | 2 | Update start.sh for network access and port configuration | 2026-03-13 | e327ab9 | [2-update-start-sh-for-network-access-and-p](./quick/2-update-start-sh-for-network-access-and-p/) |
 | 3 | Fix UI feedback: header, navigation, and layout issues | 2026-03-13 | - | [3-fix-ui-feedback-header-navigation-and-la](./quick/3-fix-ui-feedback-header-navigation-and-la/) |
+| 4 | Create Full Remote HD Web Interface at Port 9999 | 2026-03-19 | 0f281567, 3b1ece0e, 9f29b51c | [4-create-full-remote-hd-web-interface-at-p](./quick/4-create-full-remote-hd-web-interface-at-p/) |
 
 ---
 
 ## Session Continuity
 
 ### Last Session
-- **Action:** Roadmap creation
-- **Outcome:** 3-phase roadmap created with 35/35 requirements mapped
-- **Artifacts:** ROADMAP.md, STATE.md, REQUIREMENTS.md updated
+- **Action:** Quick task 4 execution
+- **Outcome:** Port 9999 added as remote HD mode, dual-mode default startup implemented
+- **Artifacts:** useDisplayMode.ts, start.sh, README.md, WIKI.md, install_everything.sh updated
 
 ### Next Expected Session
 - **Action:** `/gsd-plan-phase 1`
@@ -134,4 +135,4 @@ None - ready to begin Phase 1 planning.
 
 ---
 
-*Last updated: 2026-03-13 - Completed quick task 1: start.sh script*
+*Last updated: 2026-03-19 - Completed quick task 4: Full Remote HD Web Interface at Port 9999*