Kanji Hero

1. Faster draw search: - New 2-step recognition: realtime first, then precise refinement. - Initial results appear much sooner instead of waiting for full heavy scoring. 2. Better accuracy: - Improved candidate ranking using aggregated Vision confidence + rank + stroke-fit + frequency priority. - Shape matching is still used, but only on top candidates (faster and more stable). - Tiny/noise strokes are filtered before recognition. 3. Loading no longer feels stuck: - Added strict timeout fallback (fast pass and precise pass). - Proper task cancellation on redraw, clear, and sheet close. 4. Better draw-search UX: - New Search now button for immediate lookup. - Keeps showing current candidates while refining (Refining matches…). - Avoids rerunning search for unchanged drawings. - Helpful tip text added in the sheet. 5. Verified: - Project builds successfully for iOS Simulator after these changes.