feat: add social links to footer and optional company logo toggle

**Social Links in Footer (Page 2):**
- Replace address/phone with LinkedIn, GitHub, and Behance links
- Maintain email@ link
- All links are clickable and open in new tabs
- Footer displays social media profiles prominently

**Company Logo Toggle Feature:**
- Add "Show logos" toggle switch in top action bar
- Toggle displays company logos (48x48px) to the left of each experience item
- LinkedIn-style layout when logos are shown
- Logos hidden by default, optional display via toggle
- Graceful fallback: missing logos don't break layout (onerror handler)
- Logos directory created at static/images/logos/ with README

**Technical Implementation:**
- New CSS file: logo-toggle.css for toggle switch and logo layout
- JavaScript: toggleLogos() function for show/hide functionality
- Template updates: experience items now support flex layout with logos
- Action bar grid updated to accommodate 4 columns
- Logo display uses CSS class `.show-logos` on `.cv-paper`
- Print CSS: logos hidden in PDF exports by default

**User Experience:**
- Clean toggle switch UI with smooth animations
- Mobile responsive design
- Accessibility: proper ARIA labels for toggle
- Optional feature that doesn't clutter default view
- Professional LinkedIn-style appearance when enabled

Logos can be added to static/images/logos/ directory using filenames
from the companyLogo field in CV JSON data.

static/css/main.css

@@ -53,7 +53,7 @@ a:hover {
     margin: 0 auto;
     padding: 1rem 2rem;
     display: grid;
-    grid-template-columns: 1fr auto 1fr;
+    grid-template-columns: auto auto auto 1fr;
     align-items: center;
     gap: 2rem;
 }
@@ -357,10 +357,7 @@ a:hover {
 }
 
 /* Experience */
-.experience-item {
-    margin-bottom: 1.5rem;
-    page-break-inside: avoid;
-}
+/* Experience item layout moved to logo-toggle.css */
 
 .experience-header {
     margin-bottom: 0.6rem;