feature: add first X6 lighting configuration batch

[blak0p]

Problem statement

The configurator exposes DPI and polling controls but no lighting controls, even though report 0x05 lighting behavior is already documented from device captures.

Impact — why do you want this?

Every user who wants to change LED modes still needs Windows or manual HID writes. Lighting is a core peripheral feature, and without it the Linux configurator remains incomplete for daily use.

Proposed solution

Add an evidence-backed first lighting batch:

• Modes: Off, Fixed/Steady, and Breathing only.
• Immutable, capture-proven 13-byte report 0x05 templates; no generic encoder.
• Capture-proven color choices only.
• Stage locally, apply explicitly, validate the device ACK.
• Disable non-applicable color/speed controls when Off is selected.

Alternative solutions

Wait for captures of every documented lighting mode before shipping anything. Rejected: incremental capture-backed batches reduce protocol risk and isolate failures faster.

Additional context

Evidence: docs/protocol-captures.md (report 0x05) and docs/config-baseline.md. Verified by Go protocol/transport/desktop tests, frontend suite (42/42), production build, and physical testing on the X6.

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