refactor: Modularize CSS and fix theme-aware text colors

CSS Restructuring:
- Reorganize monolithic main.css into modular architecture
- Create foundation/ (reset, variables, typography, themes)
- Create layout/ (container, page, grid, paper)
- Create components/ (8 component files)
- Create interactive/ (toggles, remaining for future split)
- Create effects/ (skeleton loading)
- Create contexts/ (print styles)

Theme Support Fixes:
- Replace all hardcoded text colors with CSS variables
- Fix .section-title: rgb(51,51,51) → var(--text-primary)
- Fix .cv-name, .intro-text: hardcoded → theme-aware
- Fix .experience-period, .duration-text: #555/#aaa → variables
- Fix course/project/experience text colors
- Support proper light/dark theme text contrast

Icon & Layout Fixes:
- Standardize all icon sizes to 80×80px
- Change all icon backgrounds to transparent
- Fix award section layout (missing flexbox)
- Update HTML templates (experience.html, awards.html) to width='80'
- Fix default icon sizing conflicts

View Switcher Fix:
- Fix toggleTheme() to target .cv-container instead of body
- Ensures clean/default theme toggle works correctly

Files: 40+ CSS files modularized, 3 templates updated, 7 tests added

static/hyperscript/toggles._hs

@@ -55,17 +55,17 @@ end
 -- ==============================================================================
 
 def toggleTheme(isClean)
-  set body to document.body
+  set container to the first .cv-container
   set actionBarToggle to #themeToggle
   set menuToggle to #themeToggleMenu
 
   if isClean is true
-    add .theme-clean to body
+    add .theme-clean to container
     call localStorage.setItem('cv-theme', 'clean')
     if actionBarToggle exists then set actionBarToggle's checked to true end
     if menuToggle exists then set menuToggle's checked to true end
   else
-    remove .theme-clean from body
+    remove .theme-clean from container
     call localStorage.setItem('cv-theme', 'default')
     if actionBarToggle exists then set actionBarToggle's checked to false end
     if menuToggle exists then set menuToggle's checked to false end