The vendored EC bitmaps looked good but dither into a visible speckle once quantized to the panel's 6-color palette (their colors are anti-aliased/arbitrary RGB, essentially never an exact palette match). Hand-drawn icons filled with the frame's actual ink colors quantize with zero dithering error to diffuse -- confirmed by running both through the real quantize pass: the bitmap version speckles, the hand-drawn one is pixel-identical before and after. Redrawn to look more like EC's style this time around: pointed triangular sun rays (the earlier attempt's thin-line rays read as a crosshair, not a sun) and dendrite snowflakes (tick marks near each tip, not a bare asterisk), plus the same cloud/raindrop/lightning-bolt shapes as before. Removed the vendored server/app/weather_icons/ directory entirely -- no longer used, and removes the icon-image licensing question along with it.