feat: drive the Hyprland border gradient from the wallpaper accent

Replaces the six-stop RGB rainbow with the current accent plus its two
neighbours on the perceptual hue wheel. The borderangle animation rotates a
gradient, so it needs more than one colour to show motion; neighbouring hues
keep that motion legible without leaving the palette.

Emitted as Lua rather than a .conf snippet. Hyprland's Lua parser refuses
hyprctl keyword ("keyword can't work with non-legacy parsers") and has no
source directive, so look_and_feel.lua reads the generated table with dofile()
and falls back to a fixed Macchiato triple when it is absent.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01G6aeE37K4GHBsaM51yLTTq

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