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Implement minimal plate solving + overlay - #1
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The HFR pass read pixels around the refined centroid without checking bounds, so a centroid pulled toward the edge (seen on a star mask) panicked with an out-of-bounds index. The app caught it as "no stars"; now the star is skipped instead.
Every image is plate solved in the background after star detection, near the header's pointing (RA / DEC or OBJCTRA / OBJCTDEC) and pixel scale (FOCALLEN and XPIXSZ). P toggles an annotation with an RA / Dec grid, deep-sky object outlines and a north / east compass; the info overlay shows the solution. - catalog: the 30 brightest Gaia DR3 stars per ~1 deg² cell (1.23M stars, 4 bytes each, ~5 MB), positions at 2026.0 - solve: triangle matching between the brightest image points and catalog stars in tiles around the hint, then an iterated least-squares TAN fit - stars: bright points for solving, including the saturated stars HFR skips - dso: OpenNGC objects (~215 KB) - examples: catalog / DSO builders and a command-line solver; data rebuilt with scripts/build-catalog.sh Behind the blip-core `solve` feature, so the web build doesn't carry the data.
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These catalogs increase the file size by about 5 megabytes which is fine in my opinion. Due to the small catalog, there's a chance the plate-solve fails, but it also results in plate-solving in less than 100 milliseconds per frame.