Replaced inline symbolic characters with Lucide icons

Replaced all inline symbolic characters in Svelte components with their Lucide icon equivalents: - ↗ → ExternalLink (external links) - ← → ArrowLeft (back buttons) - → → ArrowRight (forward/continue buttons) - ♥ → Heart (support links) - ✓ → Check (completion indicators) - ☰ → Menu (hamburger menu references) Also removed redundant ✓/✗ from pds-landing StatusGrid (the status styling handles it) and replaced the CSS ::before arrow in LinkList with ›. Left instructional → in prose (e.g. "Tap menu → Settings → Accounts") unchanged — those are navigation breadcrumbs in text, not UI elements.