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e6842e1d3c
Three follow-ups to #2804, all bearing on one decision: which spool a print uses when the exact colour is not loaded. Colour ranking is now perceptual. The ranking added in #2804 measured RGB distance, which rates a colour by how far apart the numbers are rather than how far apart they look, and it overweights blue badly enough to invert the answer: against a required #1E4821 green, a purple #38202F is the nearer of two eligible spools by RGB and four times the further once measured properly. Both sides now use CIEDE2000 -- perceptual_color_distance in backend/app/utils/color_utils.py and colorDistance in amsHelpers.ts, kept structurally identical so they can be read side by side. Verified against the Sharma/Wu/Dalal published reference set, all 31 pairs to 1e-4, and the two implementations agree to within 1e-9 across 800 sampled pairs. Eligibility is untouched, still the per-channel RGB box, so this only reorders spools that already qualified. Type matching now agrees between the interface and the scheduler. Bambu firmware treats PA-CF, PA12-CF and PAHT-CF as one material and the scheduler has always matched them accordingly, but the interface compared raw type strings and called that same pairing a mismatch. The badge contradicted what the printer was about to do, and the manual override picker, which groups by canonical type, offered the very spool the badge then rejected. The fifteen comparison sites in useFilamentMapping.ts, useMultiPrinterFilamentMapping.ts and PrinterSelector.tsx now call filamentTypesCompatible. The pipeline pre-flight reads the matcher's table instead of its own copy. That copy had drifted into disagreeing in both directions: it aliased PLA Basic to PLA where the matcher never has, so a run could clear the check and then fail to map its slots, and it lacked the nylon grouping, so it flagged runs the matcher handles without complaint. A check whose job is to predict dispatch is wrong whenever it disagrees with dispatch, whichever way it leans, so it and the scheduler now both read backend/app/utils/filament_types.py. That canonicaliser deliberately does not strip surrounding whitespace. It looks like a free improvement, but it would collapse a junk tray_type to "" just as a 3MF declaring no filament type yields "", and a typeless requirement would start matching a junk-typed tray instead of reporting the slot unmapped. Padded type strings are worth handling on their own terms, with that case addressed. One behaviour change outside the ranking: the pre-flight is stricter for a printer reporting a product name such as "PLA Basic" where the generic material belongs, which it now flags rather than passes. Rare in practice, since the printer reports material and product name in separate fields, and it is the answer the matcher would give. Nothing about which spool a print actually uses changed outside the colour ranking itself. Adds 203 backend and 6 frontend tests. The #2804 tie-break test now uses identical colours: two colours at equal RGB distance are not perceptually tied, which is rather the point.