fix: more conspicuous search target and tighter zoom
- Crosshair replaced with amber reticle (outer ring, gapped crosshair
lines, center dot) — much more visible against both themes
- Search zoom now targets 4-15x (was 2-8x), fitting results in 30%
of viewport instead of 40%
- Label uses drawLabel with outline for readability
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>