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/02-layout/_grid.css

@@ -0,0 +1,38 @@
+/* ============================================================================
+   GRID LAYOUT - Page Content Grid
+   ============================================================================ */
+
+/* Professional Title Badges - Spans Both Columns */
+.cv-title-badges-header {
+  grid-column: 1 / -1; /* Span all columns */
+  background: #303030 !important; /* Elegant dark gray */
+  padding: 10px 20px;
+  display: flex;
+  flex-wrap: wrap;
+  justify-content: center;
+  align-items: center;
+  gap: 0;
+  border-bottom: 2px solid #34495e;
+}
+
+.title-badge {
+  font-size: 0.9em;
+  font-weight: normal;
+  color: #ccc;
+  text-transform: uppercase;
+  white-space: nowrap;
+}
+
+.badge-separator {
+  color: #ccc;
+  font-weight: normal;
+  padding: 0 15px;
+  position: relative;
+  top: -1px;
+}
+
+/* Main Content Area */
+.cv-main {
+  background: var(--paper-white);
+  padding: 3rem 2.5rem 8rem 2.5rem; /* Bottom padding for footer and zoom control clearance */
+}