demo: Regenerate ppt-creator demo with better visibility

Changes:
- Update theme: Dracula → Catppuccin Mocha
- Increase font size: 16 → 18
- Increase dimensions: 1200x600 → 1400x700
- Add typing speed for smoother animation
- Improve content flow and stage visualization

The demo now clearly shows the complete workflow:
- Content preparation (slides.md, refs.md)
- Data & chart generation
- Dual-path PPTX creation
- Final deliverables with charts

demos/ppt-creator/create-presentation.tape

@@ -1,46 +1,59 @@
 Output demos/ppt-creator/create-presentation.gif
 
-Set FontSize 16
-Set Width 1200
-Set Height 600
-Set Theme "Dracula"
-Set Padding 20
+Set FontSize 18
+Set Width 1400
+Set Height 700
+Set Theme "Catppuccin Mocha"
+Set Padding 30
+Set TypingSpeed 50ms
 
-Type "# ppt-creator Demo" Sleep 500ms Enter
-Sleep 1s
+Type "# PPT Creator - Professional Presentation Generation" Sleep 1s Enter
+Sleep 2s
 
-Type "# Create a presentation about renewable energy" Sleep 500ms
+Type "Create a presentation about renewable energy" Sleep 1s
 Enter
 Sleep 2s
 
-Type "# ppt-creator activates automatically" Sleep 500ms
+Type "# ✓ ppt-creator activates automatically" Sleep 500ms
 Enter
 Sleep 2s
 
-Type "echo 'Generating presentation...'" Sleep 500ms
+Type "# Stage 1-7: Content Preparation" Sleep 500ms
 Enter
 Sleep 1s
-
-Type "# Content creation (slides.md)" Sleep 500ms
-Enter
-Sleep 2s
-
-Type "# Data synthesis (CSV files)" Sleep 500ms
-Enter
-Sleep 2s
-
-Type "# Chart generation (matplotlib)" Sleep 500ms
-Enter
-Sleep 2s
-
-Type "# Dual-path PPTX creation" Sleep 500ms
-Enter
-Sleep 2s
-
-Type "echo '✓ presentation_marp_with_charts.pptx'" Sleep 500ms
+Type "  → slides.md (Marp format)" Sleep 500ms
 Enter
 Sleep 1s
-
-Type "echo '✓ presentation_pptx_with_charts.pptx'" Sleep 500ms
+Type "  → refs.md (speaker notes)" Sleep 500ms
 Enter
-Sleep 1s
+Sleep 2s
+
+Type "# Stage 8b-8c: Data & Charts" Sleep 500ms
+Enter
+Sleep 1s
+Type "  → synthetic_data.csv" Sleep 500ms
+Enter
+Sleep 1s
+Type "  → chart_energy_adoption.png" Sleep 500ms
+Enter
+Sleep 2s
+
+Type "# Stage 8d: Dual-Path PPTX Creation" Sleep 500ms
+Enter
+Sleep 1s
+Type "  → Path A: Marp CLI" Sleep 500ms
+Enter
+Sleep 1s
+Type "  → Path B: document-skills:pptx" Sleep 500ms
+Enter
+Sleep 2s
+
+Type "# Stage 8e: Chart Insertion" Sleep 500ms
+Enter
+Sleep 1s
+Type "  ✓ presentation_marp_with_charts.pptx" Sleep 500ms
+Enter
+Sleep 1s
+Type "  ✓ presentation_pptx_with_charts.pptx" Sleep 500ms
+Enter
+Sleep 3s