Semih Yesilyurt
3482bb86e3
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pcat/emex vehicles decode into a tree whose top level is ~100% folders with zero parts (6746/9458 root nodes are parents, 0 direct leaves across 477 vehicles). Users — serkan filazi among them — saw an opaque wall of identical folder cards, assumed the parts feature was missing, and bounced without ever drilling (his session: 3 view-mode toggles, 0 category clicks; his data was 2-3 clicks deep and fully reachable). Two changes, no upstream/proxy cost: - getCategoryTree now rolls up a subtree partCount per node (one grouped parts read + JS post-order sum). The grid already renders "N parça", so folders now read "Fren sistemi · 142 parça" and steer drilling toward the branches that actually contain parts; empty branches stay quiet. Counts reflect drilled data and grow as branches are visited. - A one-line drill hint on a "cold" tree (nothing drilled yet → no counts) so first-visit users know parts live inside the subcategories instead of reading the folder wall as a broken/empty catalog. Drops away once any branch is hit. Verified: subtree roll-up unit test + existing suite (10/10), tsc + biome clean across api/web/shared. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>