Add photo, company logos, and short/long CV toggle

Features:
- Profile photo display (right side, inline with header)
- Company logos for all major employers (8 logos downloaded)
- Short/Long CV toggle for condensed/detailed view
- Short descriptions (1-2 lines) for quick overview
- Experience separators with border lines

Photo Implementation:
- Circular photo (120px) on right side of header
- Placeholder SVG if photo not uploaded
- Instructions in ADDING-YOUR-PHOTO.md
- Photo stored in static/images/profile/

Company Logos:
- Olympic Broadcasting Services, AENA, SAP, Gigya
- Accenture, Everis, Indra, Megabanner
- 40px logos displayed inline with experience
- Auto-hide if logo missing
- Mobile: logos hidden for cleaner layout

Short/Long Toggle:
- Toggle buttons in action bar (Corto/Largo)
- Short mode: shows shortDescription only
- Long mode: shows full responsibilities + technologies
- CSS-based show/hide (no page reload)
- Defaults to short view

Layout Updates:
- Header: text left, photo right, inline alignment
- Experience items: separated by border lines
- Responsive: photo centers on mobile
- Print-optimized: smaller photo in PDF

Data Updates:
- Added shortDescription field to Experience struct
- 13 short descriptions for all positions (EN/ES)
- Added companyLogo field with filename mapping
- JSON updated with all new fields

Tech:
- Pure CSS toggle (no HTMX needed)
- Vanilla JavaScript for button states
- Maintains bilingual support (ES/EN)

static/images/profile/placeholder.svg

@@ -0,0 +1,6 @@
+<svg width="150" height="150" xmlns="http://www.w3.org/2000/svg">
+  <rect width="150" height="150" fill="#e0e0e0"/>
+  <circle cx="75" cy="60" r="25" fill="#999"/>
+  <path d="M 35 110 Q 75 90 115 110" fill="#999"/>
+  <text x="75" y="140" text-anchor="middle" font-size="10" fill="#666">Add your photo</text>
+</svg>