forked from unom/punktfunk
Windows counterpart of 5c7e0afa's Linux per-pad pairing MAC: every virtual DualSense / Edge / DualShock 4 presented ONE hardcoded serial, so SDL/Steam (which dedup controllers by serial) could merge a second pad into the first. * GET_FEATURE pairing replies (DS/Edge 0x09, DS4 0x12) now carry the pad index the host stamps into the sealed section in the MAC's low octet. * GET_STRING serial strings (HidD_GetSerialNumberString — what SDL actually reads on Windows) get the same per-pad low octet, agreeing with the feature MAC. The Edge's 0x09 reply moves onto its serial-string base (0x75 = DS base + 1), fixing the pre-existing feature-vs-string mismatch. * The Deck identity already did this per-pad; its two inline index reads now share the new `pad_index()` helper. Pad 0 keeps today's serial values for DS / DS4 / Deck (no identity churn for existing single-pad setups). Verified on the windows-amd64 runner: cargo build + clippy -D warnings (pf-umdf-util / pf-xusb / pf-dualsense) + fmt clean on the pinned 1.96.0. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>