docs(transit): changelog fragment and 72-variant icon cache in CURRENT-STATE

changelog.d/1574-transit-icon-heading.md

@@ -0,0 +1,5 @@
+- Give transit vehicle icons a readable front: the bus, tram, metro and unknown
+  glyphs now carry a nose or cab in their outline, so the direction of travel
+  shows at fleet size and survives the sensor profiles. A vehicle with no known
+  course gets a symmetric outline instead of one that points north, and
+  switches to the pointed glyph once a course arrives (IMBrandao, #1574).

docs/CURRENT-STATE.md

@@ -4872,8 +4872,11 @@ visual inspection.
 **Appearance.** Normal fleet frames are 20 px, growing to 30 px on selection;
 CRT, NVG, thermal and noir frames are 26/39 px. Source rasters are 48/96 px before padding.
 External halos are 1/1.5 px in normal, 1.25/1.25 px in CRT and 2/2 px in sensors, calculated from the
-final unpadded display size. Six modes, two sizes and three profiles cap the
+final unpadded display size. Each mode has an outline with a front (a nose, a
-raster cache at 36 variants. Normal mode colours are bus `#5EF08A`, tram
+bow or a chamfered cab) for a vehicle with a known course and a symmetric
+outline for one without, which would otherwise sit at rotation 0 and point
+north; a vehicle switches to the pointed glyph when a course arrives. Six modes, two sizes, three
+profiles and the two outlines cap the raster cache at 72 variants. Normal mode colours are bus `#5EF08A`, tram
 `#FFC24A`, subway `#FF4538`, rail `#D9A6FF`, ferry `#5FD6FF`, and unknown
 `#D8DDE5`. Selection keeps the mode colour. Sensors reuse each normal silhouette's exact
 outer path, filled opaque white without interior panel lines, with an opaque