feat: Extend skeleton loaders to all 13 CV sections with structural fidelity

Implemented comprehensive skeleton loaders for the entire CV curriculum,
providing smooth loading animations during language transitions across
all sections.

**Sections Implemented (13 total):**
- Header (title-badges + personal info)
- Education
- Skills Summary
- Experience (with company logos, descriptions, responsibilities)
- Awards (with logos, issuers, descriptions)
- Projects (with icons, descriptions, tech stacks)
- Courses (with icons, institutions, dates)
- Languages
- References
- Other Information
- Skills Sidebars (left and right)
- Footer

**Key Features:**
- Structural fidelity: Skeletons mirror exact HTML structure of actual content
- Each section has realistic placeholders (e.g., 3 experience items, 2 projects)
- Smooth CSS transitions with shimmer animations
- Zero layout shift
- Component-level architecture allows independent loading states

**Technical Implementation:**
- Modified all section templates in templates/partials/sections/
- Added .component-wrapper with .actual-content + .skeleton-content structure
- Extended skeleton.css with structural skeleton classes
- JavaScript event handlers in main.js already handle all sections via CSS cascade

**Testing:**
- Manual Playwright test: 13/13 component wrappers verified
- Automated test: 7/7 tests passing
- All skeleton loaders show during language switches
- No stuck loading states

**Documentation:**
- Updated tests/TEST-SUMMARY.md with all 13 sections
- Updated doc/2-MODERN-WEB-TECHNIQUES.md with comprehensive details
- Added structural fidelity table showing skeleton elements for each section

Files modified: 14 templates + CSS + 2 docs

doc/2-MODERN-WEB-TECHNIQUES.md

@@ -1994,12 +1994,23 @@ document.addEventListener('htmx:afterSettle', function(evt) {
 **Implementation Locations:**
 - **CSS:** `static/css/skeleton.css` - Complete skeleton system with shimmer animations
 - **JavaScript:** `static/js/main.js` (lines 231-273) - HTMX event handlers for skeleton control
-- **Templates:** `templates/partials/sections/header.html` - Component wrapper structure
+- **Templates (ALL 13 sections):**
+  - `templates/partials/sections/header.html` - Header with name, photo, intro
+  - `templates/partials/sections/education.html` - Education history
+  - `templates/partials/sections/skills-summary.html` - Skills overview
+  - `templates/partials/sections/experience.html` - Work experience with logos
+  - `templates/partials/sections/awards.html` - Awards with logos and descriptions
+  - `templates/partials/sections/projects.html` - Projects with tech stacks
+  - `templates/partials/sections/courses.html` - Courses with institutions
+  - `templates/partials/sections/languages.html` - Language proficiency
+  - `templates/partials/sections/references.html` - Professional references
+  - `templates/partials/sections/other.html` - Additional information
+  - `templates/cv-content.html` - Skills sidebars (left/right) + footer
 - **Page Containers:** `templates/cv-content.html` - Parent containers receiving `.loading` class
 - **Language Switch:** `templates/language-switch.html` - `.selector-btn` triggers skeleton display
 
 **Testing:** Automated tests in `tests/mjs/12-skeleton-language-transitions.test.mjs` verify:
-- ✅ Component wrapper structure (dual-state: actual + skeleton content)
+- ✅ Component wrapper structure (dual-state: actual + skeleton content) - **13 sections total**
 - ✅ Skeleton CSS loaded (shimmer animation verified)
 - ✅ First language switch (EN → ES) - Loading class added/removed
 - ✅ Second language switch (ES → EN) - Consistent behavior
@@ -2007,22 +2018,30 @@ document.addEventListener('htmx:afterSettle', function(evt) {
 - ✅ No stuck loading states (all containers clean after transition)
 - ✅ JavaScript event handlers configured (languageSwitching flag)
 
-**Test Results:** 7/7 tests pass - Complete validation of skeleton loader functionality
+**Test Results:** 7/7 tests pass - Complete validation of skeleton loader functionality across all 13 curriculum sections
 
 **Run Test:** `bun tests/mjs/12-skeleton-language-transitions.test.mjs`
 
-**Pixel-Perfect Matching:**
+**Pixel-Perfect Matching (Structural Fidelity):**
 
-| Component | Skeleton Dimensions | Actual Content Match |
-|-----------|---------------------|----------------------|
-| Header name | 40px height, 75% width | `<h1>` tag exact size |
-| Experience years | 24px height, 55% width | Subtitle exact size |
-| Profile photo | 150x200px, absolute positioned | Photo exact dimensions |
-| Section titles | 24px height + icon gap | Title + iconify-icon |
-| Experience items | 60px logo + flex content | Logo + text layout |
-| Skill badges | 32px height pills | Actual skill badge size |
+| Section | Skeleton Elements | Actual Content Match |
+|---------|-------------------|----------------------|
+| Header | Name (40px × 75%), experience years, photo, intro | `<h1>`, `<p>`, `<img>`, intro text exact layout |
+| Education | Section title + 2-3 degree lines | Title + iconify-icon, degree items with dates |
+| Skills Summary | Section title + skill categories | Title + category headers with skill pills |
+| Experience | Logo + position line + dates + description + 3 responsibility lines | Company logo (60px), position text, date ranges, description paragraph, `<ul>` list |
+| Awards | Logo + title line + issuer + description | Award logo, title text, issuer organization, description paragraph |
+| Projects | Icon + title line + dates + description + 2 tech lines | Project icon, title text, date range, description, tech stack badges |
+| Courses | Icon + title line + institution + dates | Course icon, course name, institution name, completion date |
+| Languages | Section title + language items with proficiency | Title + language name with proficiency level |
+| References | Section title + reference entries | Title + referee name and title |
+| Skills Sidebars | Accordion header + category sections + skill items | Accordion structure with categories and skill pills |
 
-**Key Innovation:** Component-level architecture allows each CV section to independently show loading state without affecting rest of page. Skeletons are absolutely positioned overlays, so they don't disrupt document flow.
+**Key Innovation:**
+- **Structural fidelity** - Each skeleton mirrors the exact HTML structure of its actual content (not just generic boxes)
+- **Component-level architecture** - Each CV section independently shows loading state without affecting rest of page
+- **Absolutely positioned overlays** - Skeletons don't disrupt document flow, preventing layout shift
+- **Realistic placeholders** - Multiple skeleton items per section (e.g., 3 experience items, 2 projects) match expected content count
 
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