feat: improve station map navigation and overlays

docs/superpowers/specs/2026-11-04-map-overlay-legend-and-screenshot-design.md

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+# Map Overlay Legend and Screenshot Design
+
+## Intent
+
+Make the two map overlays understandable without consulting the manual and replace the outdated general map image with the supplied screenshot of an active QRB range.
+
+## Behaviour
+
+- The map header shows a compact red **Antenna** legend item only while the antenna sector can be drawn.
+- It shows a compact blue **Active filters** legend item only while a valid QTF or QRB overlay is active.
+- A localized tooltip explains that red represents the actual antenna heading, beamwidth and maximum QRB, while blue represents active QTF and QRB filters.
+- The existing responsive `FlowRow` may wrap the legend with the other header controls.
+- Overlay rendering, filtering, antenna heading and rotor behaviour do not change.
+
+## Screenshot
+
+- Store the supplied image as `github_docs/station_map_spatial_filters.png` without altering its pixels.
+- Use it in the German and English UI manual and on the Station Map website feature page.
+- Describe the visible range correctly as minimum and maximum QRB, not QTF.
+- Retain `station_map_path_analysis.png` where the visible path-analysis panels are the subject.
+
+## Constraints
+
+- Reuse the exact overlay colours rather than duplicating colour literals.
+- Keep English and German UI strings and documentation aligned.
+- Do not stage, commit, push or publish any change.