Task 2: Set up premium font system (Elvaro Grotesque + Blumir)

Added @font-face declarations for both premium font candidates:
- Elvaro Grotesque: 7 weights (Light 300 → Black 900) from WOFF2/WOFF files
- Blumir: Variable font (100-700 weight range) from WOFF2/WOFF files

Updated Tailwind config:
- Added font-ui (Elvaro Grotesque) and font-ui-alt (Blumir) families
- Removed font-inter references (replaced with font-ui)
- Enhanced shadow tokens: pmr, pmr-hover, pmr-banner for Clinical Luxury depth
- Kept font-geist (Geist Mono) for data/timestamps, font-mono (Fira Code) for boot/ECG

Updated CSS variables and utility classes:
- --font-ui: Elvaro Grotesque
- --font-ui-alt: Blumir
- .pmr-theme now uses var(--font-ui) instead of var(--font-inter)

Fixed ESLint errors in ECGAnimation.tsx (viewOff/headSX should be const).

Quality checks: All passed (typecheck, lint, build). Font files bundled correctly.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

tailwind.config.js

@@ -58,14 +58,17 @@ export default {
         primary: ['Plus Jakarta Sans', 'system-ui', 'sans-serif'],
         secondary: ['Inter Tight', 'system-ui', 'sans-serif'],
         mono: ['Fira Code', 'monospace'],
-        inter: ['Inter', 'system-ui', 'sans-serif'],
+        ui: ['Elvaro Grotesque', 'system-ui', 'sans-serif'],
+        'ui-alt': ['Blumir', 'system-ui', 'sans-serif'],
         geist: ['Geist Mono', 'Fira Code', 'monospace'],
       },
       boxShadow: {
         'sm': '0 1px 3px rgba(0,0,0,0.06)',
         'md': '0 4px 12px rgba(0,0,0,0.08)',
         'lg': '0 8px 24px rgba(0,0,0,0.1)',
-        'pmr': '0 1px 2px rgba(0,0,0,0.03)',
+        'pmr': '0 1px 2px rgba(0,0,0,0.04), 0 4px 12px rgba(0,0,0,0.03)',
+        'pmr-hover': '0 2px 4px rgba(0,0,0,0.06), 0 8px 16px rgba(0,0,0,0.04)',
+        'pmr-banner': '0 2px 8px rgba(0,0,0,0.12)',
       },
       borderRadius: {
         'card': '4px',