fix(app): iOS HIG Phase 1 — input font sizes and text minimums

- Replace all text-[10px] (308 instances) with text-xs (12px)
- Replace all text-[9px] and text-[8px] (133 instances) with text-xs
- Replace all text-[11px] (76 instances) with text-xs
- Bump all input/textarea font sizes to text-base (16px) to prevent iOS auto-zoom
- No visual design changes — only sizing minimums enforced

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/app/src/components/renderers/PdfViewer.vue

@@ -46,7 +46,7 @@
       >
         <span class="text-xs font-bold">−</span>
       </button>
-      <span class="text-[10px] text-white/40 tabular-nums w-10 text-center">{{ Math.round(scale * 100) }}%</span>
+      <span class="text-xs text-white/40 tabular-nums w-10 text-center">{{ Math.round(scale * 100) }}%</span>
       <button
         class="w-8 h-8 flex items-center justify-center rounded-lg text-white/60 hover:text-white/80 hover:bg-white/10 transition-colors disabled:opacity-30"
         :disabled="scale >= 2"