chore: complete OOTB QA audit

Fixes identified during the thorough distro review:
- Restore automatic wallpaper switching by removing image filters from deployed themes.
- Fix broken 'Style' menu entries by creating missing about.txt and screensaver.txt branding files.
- Clean up conflicting keybindings by removing deprecated tiling.conf and updating doc generator.
- Remove legacy Nord theme hack from nomarchy-theme-set.
- Fix JSON parse error in summer-day waybar theme.

bin/utils/nomarchy-docs-keybindings

@@ -15,8 +15,7 @@ repo_root="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)"
 
 sources=(
   "core/home/config/nomarchy/default/hypr/bindings/utilities.conf|Utilities"
-  "core/home/config/nomarchy/default/hypr/bindings/tiling.conf|Tiling"
-  "core/home/config/nomarchy/default/hypr/bindings/tiling-v2.conf|Tiling (v2)"
+  "core/home/config/nomarchy/default/hypr/bindings/tiling-v2.conf|Tiling"
   "core/home/config/nomarchy/default/hypr/bindings/clipboard.conf|Clipboard"
   "core/home/config/nomarchy/default/hypr/bindings/media.conf|Media keys"
   "features/desktop/hyprland/config/bindings.conf|Apps & web shortcuts"