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/content/ContextLoader.vue

@@ -15,7 +15,7 @@
           {{ contextLabel }}
         </p>
         <div class="flex items-center gap-2 shrink-0">
-          <p class="text-[10px] font-mono uppercase tracking-[0.2em]"
+          <p class="text-xs font-mono uppercase tracking-[0.2em]"
              :class="isDark ? 'text-white/25' : 'text-gray-400'">
             Surfacing…
           </p>