fix(spacing): connect section spacing to design token system

Wire .hbb-section to var(--hb-spacing-section) instead of hardcoded 6rem,
enabling hugoblox.layout.spacing (compact/comfortable/spacious) to take effect.

- Default to "spacious" (6rem) to preserve existing visual layouts
- Per-section override via design.spacing.padding still works (inline > class)
- Remove dead design.spacing frontmatter field from all templates
- Set correct layout.spacing token in each template's params.yaml

Closes #3314

templates/academic-cv/config/_default/params.yaml

@@ -70,7 +70,7 @@ hugoblox:
     # Border radius: 'none', 'sm', 'md', 'lg', or 'full'
     radius: "md"
     # Spacing density: 'compact', 'comfortable', or 'spacious'
-    spacing: "comfortable"
+    spacing: "spacious"
     # Avatar shape in author profiles
     avatar_shape: circle                # circle | square | rounded
 

templates/academic-cv/content/_index.md

@@ -5,10 +5,6 @@ summary: ''
 date: 2022-10-24
 type: landing
 
-design:
-  # Default section spacing
-  spacing: '6rem'
-
 sections:
   - block: resume-biography-3
     content:

templates/academic-cv/content/projects/_index.md

@@ -3,10 +3,6 @@ title: 'Projects'
 date: 2024-05-19
 type: landing
 
-design:
-  # Section spacing
-  spacing: '5rem'
-
 # Page sections
 sections:
   - block: collection

templates/dev-portfolio/content/_index.md

@@ -5,10 +5,6 @@ summary: ''
 date: 2026-01-05
 type: landing
 
-design:
-  # Default section spacing
-  spacing: '0'
-
 sections:
   # Developer Hero - Gradient background with name, role, social, and CTAs
   - block: dev-hero

templates/dev-portfolio/content/projects/_index.md

@@ -3,10 +3,6 @@ title: 'Projects'
 date: 2024-05-19
 type: landing
 
-design:
-  # Section spacing
-  spacing: '5rem'
-
 # Page sections
 sections:
   - block: collection

templates/documentation/config/_default/params.yaml

@@ -70,7 +70,7 @@ hugoblox:
     # Border radius: 'none', 'sm', 'md', 'lg', or 'full'
     radius: "md"
     # Spacing density: 'compact', 'comfortable', or 'spacious'
-    spacing: "comfortable"
+    spacing: "spacious"
     # Avatar shape in author profiles
     avatar_shape: circle                # circle | square | rounded
 

templates/documentation/content/_index.md

@@ -3,10 +3,6 @@ title: 'Home'
 date: 2023-10-24
 type: landing
 
-design:
-  # Default section spacing
-  spacing: "6rem"
-
 sections:
   - block: hero
     content:

templates/markdown-slides/content/_index.md

@@ -4,9 +4,6 @@ summary: ''
 date: 2025-01-01
 type: landing
 
-design:
-  spacing: '4rem'
-
 sections:
   # Hero Section
   - block: hero

templates/resume/content/_index.md

@@ -3,10 +3,6 @@ title: 'Home'
 date: 2023-10-24
 type: landing
 
-design:
-  # Default section spacing
-  spacing: '4rem'
-
 # Note: `username` refers to the user's folder name in `content/authors/`
 
 # Page sections

templates/startup-landing-page/config/_default/params.yaml

@@ -80,7 +80,7 @@ hugoblox:
     # Border radius: 'none', 'sm', 'md', 'lg', or 'full'
     radius: "md"
     # Spacing density: 'compact', 'comfortable', or 'spacious'
-    spacing: "comfortable"
+    spacing: "spacious"
     # Avatar shape in author profiles
     avatar_shape: circle                # circle | square | rounded
 

templates/startup-landing-page/content/_index.md

@@ -3,10 +3,6 @@ title: 'Home'
 date: 2023-10-24
 type: landing
 
-design:
-  # Default section spacing
-  spacing: "6rem"
-
 sections:
   - block: hero
     content: