feat: Add year-aware PDF shortcut URLs + Default CV modal option

## Shortcut URLs
- New routes: /cv-jamr-{year}-{lang}.pdf (e.g., /cv-jamr-2025-en.pdf)
- Year validation: Only current year accepted, returns 404 for past/future
- Auto-redirects (301) to: /export/pdf?lang={lang}&length=short&icons=show&version=with_skills
- Both languages supported: en and es

## PDF Modal Updates
- Replaced "Current View" option with "Default CV (Recommended)"
- Visual highlighting: purple gradient badge, star emoji ⭐, bold text
- Uses shortcut URL with dynamic year detection
- Clear recommendation for users (5 pages, short with skills)

## Technical Details
- Handler: DefaultCVShortcut() in internal/handlers/cv.go
- Pattern check in Home() handler for proper routing
- Helper function: window.openPdfModal() for references section
- Documentation: PDF-SHORTCUT-IMPLEMENTATION.md

Benefits:
- Memorable, shareable URLs (juan.andres.morenorub.io/cv-jamr-2025-en.pdf)
- Auto-updates yearly without code changes
- Clear user guidance for recommended CV format

templates/partials/modals/pdf-modal.html

@@ -157,12 +157,12 @@
                 </div>
             </div>
 
-            <!-- Current View Card -->
-            <div class="pdf-option-card"
-                 data-cv-format="current"
+            <!-- Default CV Card (Recommended) -->
+            <div class="pdf-option-card pdf-option-recommended"
+                 data-cv-format="default"
                  role="radio"
                  aria-checked="false"
-                 aria-label="{{if eq .Lang "es"}}Vista Actual - Como se ve en pantalla{{else}}Current View - As shown on screen{{end}}"
+                 aria-label="{{if eq .Lang "es"}}CV Por Defecto - 5 páginas con habilidades (Recomendado){{else}}Default CV - 5 pages with skills (Recommended){{end}}"
                  tabindex="0"
                  _="on click
                       -- Remove selected from all cards
@@ -185,8 +185,8 @@
 
                       -- Announce to screen readers
                       set announcement to #pdf-selection-announcement
-                      if :selectedFormat is 'current'
-                        set announcement.textContent to '{{if eq .Lang "es"}}Seleccionado: Vista Actual{{else}}Selected: Current View{{end}}'
+                      if :selectedFormat is 'default'
+                        set announcement.textContent to '{{if eq .Lang "es"}}Seleccionado: CV Por Defecto (Recomendado){{else}}Selected: Default CV (Recommended){{end}}'
                       end
                     end
 
@@ -197,22 +197,32 @@
                       end
                     end">
 
-                <div class="pdf-thumbnail thumbnail-custom">
-                    <!-- Centered icon representing current screen view -->
-                    <div class="custom-placeholder">
-                        <iconify-icon icon="mdi:monitor" width="80" height="80"></iconify-icon>
-                        <p>{{if eq .Lang "es"}}En Pantalla{{else}}On Screen{{end}}</p>
+                <div class="pdf-thumbnail thumbnail-default">
+                    <!--  Two-column layout with sidebar -->
+                    <div class="skeleton-block" style="height: 36px; margin-bottom: 6px;"></div>
+                    <div style="display: flex; gap: 4px;">
+                        <div style="width: 25%; display: flex; flex-direction: column; gap: 3px;">
+                            <div class="skeleton-block" style="height: 20px;"></div>
+                            <div class="skeleton-block" style="height: 16px;"></div>
+                        </div>
+                        <div style="width: 75%; display: flex; flex-direction: column; gap: 3px;">
+                            <div class="skeleton-block" style="height: 32px;"></div>
+                            <div class="skeleton-block" style="height: 32px;"></div>
+                        </div>
                     </div>
 
-                    <!-- Current view badge -->
-                    <div class="thumbnail-badge">
-                        {{if eq .Lang "es"}}Vista Actual{{else}}Current{{end}}
+                    <!-- Page count badge with star -->
+                    <div class="thumbnail-badge" style="background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); font-weight: 600;">
+                        ⭐ {{if eq .Lang "es"}}5 Páginas{{else}}5 Pages{{end}}
                     </div>
                 </div>
 
                 <div class="pdf-option-info">
-                    <h3>{{if eq .Lang "es"}}Vista Actual{{else}}Current View{{end}}</h3>
-                    <p>{{if eq .Lang "es"}}Como se ve en pantalla{{else}}As shown on screen{{end}}</p>
+                    <h3>
+                        {{if eq .Lang "es"}}CV Por Defecto{{else}}Default CV{{end}}
+                        <span style="color: #667eea; font-size: 0.9em;">⭐</span>
+                    </h3>
+                    <p style="font-weight: 500;">{{if eq .Lang "es"}}Corto con habilidades - Recomendado{{else}}Short with skills - Recommended{{end}}</p>
                 </div>
 
                 <div class="pdf-option-badge">
@@ -249,6 +259,10 @@
             if (selectedFormat === 'short') {
                 // Short CV: clean version (no skills), short length
                 url = `/export/pdf?lang=${lang}&length=short&icons=show&version=clean`;
+            } else if (selectedFormat === 'default') {
+                // Default CV: use shortcut URL (short with skills, 5 pages)
+                const currentYear = new Date().getFullYear();
+                url = `/cv-jamr-${currentYear}-${lang}.pdf`;
             } else if (selectedFormat === 'long') {
                 // Long CV: with skills sidebar, long length
                 url = `/export/pdf?lang=${lang}&length=long&icons=show&version=with_skills`;