v1.8 — bug fixes, live Speed control, fresh-install fixes

Bug fixes, a new control, and honest answers to two direct questions: does this actually install cleanly on a fresh box, and does the landing page look like a real project?

• Fixed: Breathing/Colour Cycle on Main Board left the six keys with no individual LED (Win/Alt/AltGr/Menu/right-Ctrl/right-Shift) stuck at a stale colour on screen while the rest of the board updated. The real hardware was almost certainly fine — this was the on-screen preview under-covering what the real apply already reaches.
• New: a live Speed slider (20%–300%) for every effect — drag it mid-animation, no restart needed.
• New: Profiles now remember an active effect, not just whatever colour happened to be showing when you saved. Loading a profile that had Colour Cycle running resumes the cycle, at the same speed, on the same zone.
• Fixed a real install gap: git isn't guaranteed on a fresh, minimal Arch install (confirmed against Arch's own package group definitions), so the very first documented command could fail before you ever reached this app's own installer. INSTALL.md now says so upfront, with a git-free download alternative; the script itself now checks for sudo too instead of failing with a confusing error.
• Landing page got a badges row and an honest "cheeky bits" section — real facts from this project's own development, not filler.

Every fix verified on real hardware before this tag was cut — see the commit history for the exact numbers, including a byte-for-byte check that this machine's 8 real saved profiles were untouched throughout.