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/css/01-foundation/_reset.css

@@ -0,0 +1,36 @@
+/* ============================================================================
+   CSS RESET - Normalize & Base Styles
+   ============================================================================ */
+
+/* Box sizing reset */
+* {
+  margin: 0;
+  padding: 0;
+  box-sizing: border-box;
+}
+
+/* Body base */
+body {
+  background-color: var(--page-bg);
+  background-image:
+    linear-gradient(90deg, rgba(0, 0, 0, 0.05) 1px, transparent 1px),
+    linear-gradient(180deg, rgba(0, 0, 0, 0.05) 1px, transparent 1px),
+    linear-gradient(90deg, rgba(0, 0, 0, 0.02) 1px, transparent 1px),
+    linear-gradient(180deg, rgba(0, 0, 0, 0.02) 1px, transparent 1px);
+  background-size: 50px 50px, 50px 50px, 10px 10px, 10px 10px;
+  background-attachment: fixed;
+  overflow-x: auto;
+}
+
+/* Smooth scrolling */
+html {
+  scroll-behavior: smooth;
+  scroll-padding-top: 70px; /* Account for fixed header */
+}
+
+/* Ensure Iconify icons display properly */
+.iconify,
+iconify-icon {
+  display: inline-block;
+  vertical-align: middle;
+}