feat: add responsive typography scaling for desktop readability

- Add CSS clamp() for fluid font-size scaling (16px to 20px based on viewport)
- Apply responsive breakpoint classes to all components:
  * text-xs → lg:text-sm xl:text-base
  * text-sm → lg:text-base xl:text-lg
  * text-base → lg:text-lg xl:text-xl
  * text-lg → lg:text-xl xl:text-2xl
  * text-xl → lg:text-2xl xl:text-3xl
  * text-2xl → lg:text-3xl xl:text-4xl
  * text-3xl → lg:text-4xl xl:text-5xl
- Apply responsive padding/spacing scaling proportionally
- Updated 27 component and page files
- Build verified: 6 routes, zero TypeScript errors
- Fixes readability on MacBook Pro 14" and other desktop screens without browser zoom

.claude/settings.local.json

@@ -68,7 +68,9 @@
       "Bash(sed -i -e 's/\\\\btext-slate-100\\\\b/text-secondary/g' -e s/placeholder:text-slate-700/placeholder:text-muted/g -e s/hover:text-slate-300/hover:text-secondary/g app/page.tsx)",
       "Bash(sed -i 's/\\\\btext-slate-300\\\\b/text-secondary/g' app/page.tsx)",
       "Bash(npx tsc *)",
-      "Bash(python -m pytest backend/tests/ -q)"
+      "Bash(python -m pytest backend/tests/ -q)",
+      "Bash(chmod +x /tmp/update_fonts.sh)",
+      "Bash(/tmp/update_fonts.sh)"
     ]
   }
 }