fix: Implement proper fonts and visible logo

Font fixes:
- Added Title component styles in theme.ts to apply Forum font
- Body uses Zalando Sans via theme fontFamily
- All headings (h1-h6) now use Forum via Title component styles

Logo fixes:
- Rewrote SVG with simplified paths at larger scale
- Removed complex transforms causing content to be outside viewBox
- Logo now renders at 32x32px with clearly visible wave graphic
- Save button now generates draft from conversation

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

components/Navigation/MobileHeader.tsx

@@ -27,8 +27,8 @@ export function MobileHeader() {
         <img
           src="/logo.svg"
           alt="Ponderants logo"
-          width={48}
-          height={48}
+          width={32}
+          height={32}
           style={{ flexShrink: 0, display: 'block' }}
         />
         <Title order={3} style={{ margin: 0 }}>