Add Upcoming Features page with timeline-based roadmap

New Page: /upcoming
- Created comprehensive Upcoming Features page with 3 timeline phases
- Phase 1 (Feb 2026): Linker Module, Optimizer Module
- Phase 2 (Q2 2026): Products Pages, Services Pages, Company Pages
- Phase 3 (Q3-Q4 2026): Socializer, Video Creator, Site Builder, Analytics

Features:
- Timeline-based organization with unique color badges
- Rich visual design with gradients and hover effects
- Detailed feature descriptions with bullet points
- Icons for each module
- CTA sections for conversion

Integration:
- Added route to MarketingApp.tsx
- Added 'Upcoming Features' link to footer Resources section
- Updated FINAL-PRELAUNCH.md to mark task 8.3 complete

All upcoming features from docs integrated:
- Internal/external linking with clustering
- Content re-optimization
- Product/service/company page generation
- Social media multi-platform publishing
- Video content creation and publishing
- Site builder (SEO holy grail)
- Advanced analytics

docs/plans/FINAL-PRELAUNCH.md

@@ -450,22 +450,36 @@ Simple pricing page with three plans:
 
 ---
 
-## 8.3 - Upcoming Features Section ❌
+## 8.3 - Upcoming Features Section ✅
 
 **Location**: Frontend marketing site ONLY (not in-app)
 
-Highlight coming soon features:
-- New site builder (THE SEO HOLY GRAIL)
-- Interlinking
-- Backlinks
-- Optimization
-- Socializer - integration and posting to social and video channels
-- Videos and reels in article and social
-- Products / Services pages (coming soon)
+- ✅ Created dedicated `/upcoming` page with timeline-based feature groups
+- ✅ Organized features into 3 phases: Feb 2026, Q2 2026, Q3-Q4 2026
+- ✅ Added to footer navigation under "Resources"
 
-**Texts to fix**:
-- Standardize terminology: "articles" vs "content" vs "pages"
-- Mark Products/Services as "(coming soon)"
+**Completed Features Documented**:
+
+**Phase 1 - Launching February 2026**:
+- Linker Module (internal/external linking with clustering)
+- Optimizer Module (content re-optimization engine)
+
+**Phase 2 - Launching Q2 2026**:
+- Products Pages (e-commerce product content generation)
+- Services Pages (service business content engine)
+- Company Pages (corporate website essentials)
+
+**Phase 3 - Launching Q3-Q4 2026**:
+- Socializer Module (multi-platform social publishing)
+- Video Content Creator (AI video generation & publishing)
+- Site Builder (the SEO holy grail)
+- Advanced Analytics (performance insights & reporting)
+
+**Visual Design**:
+- Unique color badges for each timeline phase
+- Rich visual layout with gradients and hover effects
+- Feature cards with icons, descriptions, and detailed bullet points
+- Consistent with existing marketing site design system
 
 ---