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.

docs/ROADMAP.md

@@ -19,7 +19,7 @@ Guardrails (apply when adding anything):
 
 ### Now (ready to pick up)
 
-- **Thorough Out-of-the-Box QA Audit.** A complete and thorough review of the distro to identify and fix anything broken or not working as intended in a fresh installation (including the `nomarchy-live` ISO) without any manual configuration. Focus areas: theme engine and switching, script execution, menu mappings, and overall default desktop polish.
+- (Empty for now)
 
 ### Next (bigger lifts that build on Now)
 
@@ -136,6 +136,7 @@ Nomarchy is moving away from being a "flavor" of Omarchy to its own distinct ide
 
 (Move items here when they land — keep them brief, link the commit/PR.)
 
+- _2026-05-04_ — Thorough Out-of-the-Box QA Audit. (1) Restored automatic wallpaper switching by removing image filters from deployed themes; (2) Fixed broken "Style" menu entries by creating missing `about.txt` and `screensaver.txt` branding files; (3) Cleaned up conflicting keybindings by removing deprecated `tiling.conf` and updating the doc generator; (4) Removed legacy Nord theme hack from `nomarchy-theme-set`; (5) Fixed JSON parse error in `summer-day` waybar theme.
 - _2026-05-03_ — Fixed multi-disk LUKS/BTRFS boot hang. (1) Moved temporary LUKS keyfile to `/tmp/` so Disko correctly omits it from the runtime configuration; (2) Injected `x-systemd.requires` and `x-systemd.device-timeout=0` into BTRFS mount options to ensure all LUKS drives are decrypted before mounting.
 - _2026-05-03_ — Fixed CLI wrappers and removed obsolete code. (1) Updated `nomarchy-font`, `nomarchy-theme`, and `nomarchy-wallpaper` CLI wrappers to use modern Walker menus; (2) Removed the obsolete and broken `themes/engine/switcher.nix` and its associated Nix-inlined scripts; (3) Cleaned up remaining `$NOMARCHY_PATH` references from the Omarchy era.
 - _2026-05-03_ — Fixed `/etc/nixos` ownership after installation. Added a `chown -R $USERNAME:users /etc/nixos` step via `nixos-enter` at the end of `installer/install.sh` so the main user owns their configuration and can run `home-manager` commands without `sudo`.