feat(dareu): add A950 PRO Mg controls

[PHATWalrus]

Summary

• Clean re-derivation of feat(dareu): add A950 PRO Mg controls #218 against current main, using existing generic DPI, polling, profiles, button-mapping, lighting, and power cards.
• Adds the Dareu A950 PRO Mg UI handoff for wired 260d:1117 and the 2.4 GHz receiver 260d:1114.
• Places the DPI indicator and mouse auto-sleep in Overview when the driver reports the power-overview hint.

Protocol

Uses the merged OpenMouse-Project/mouse-protocol#89 driver. The lockfile pins merge commit 75fa832, because current OpenMouse main still points to a pre-Dareu protocol commit.

Hardware boundary

• Receiver path is hardware-verified in the protocol work.
• Wired path is descriptor-recognized but not hardware-verified.
• No macro/reset/calibration/firmware/pairing writes are exposed.

Verification

• npm ci && npm run check — passed (typecheck, production build, 134/134 tests).
• git diff --check — passed.
• GitNexus change scan reviewed: UI and HID activation reach are high-impact; this port preserves capability gates and delegates all writes to the protocol driver’s readback methods.

Artwork

The mapping references dareu-a950-pro-mg.png; the source URL and R2/licensing handoff are documented in public/devices/README.md. No vendor image binary is committed.

Clean replacement for #218.

[snekxs]

Resolved conflicts against current main (additive registration changes from sibling driver PRs, plus a workspace-tab consolidation from #251) and merged as #252. Since #246 lives on a fork, I couldn't push the fixes to this branch directly. Thanks for the clean re-derivation work here!