tanin-icons: accent-reactive folder icon theme (replaces Papirus)

New package packaging/tanin-icons/ generating 5 thin themes Tanin-<accent>
that inherit Adwaita and recolour only the folder/place ramp to the muted
Fuji accent (HSL shift keeping per-stop lightness; 16px rasterised so the
size-exact inherited blue PNG can't win).

- style.py: _set_gsettings now also sets icon-theme=Tanin-<accent_key> so
  folders recolour live with the accent.
- desktop.py: hide Tanin-* from the manual icon picker (accent-driven, a
  manual pick would be overridden on the next accent change).
- panel.py: pin-add icon hint Papirus -> Adwaita.
- build/finish-tanin-repo.sh: tanin-icons in OWN_SIMPLE; AUR rebuilds add
  librewolf-bin, arch-update, timeshift-autosnap, xdg-terminal-exec, paru.
- camel.toml: icon_theme=Tanin-<accent>, icons=[adwaita], tanin-icons own
  package + the new rebuilt_aur entries.

Deliberately excludes unrelated in-flight work (calendar/gtklock/
online-accounts/overview-backdrop) still uncommitted in the tree.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

packaging/finish-tanin-repo.sh

@@ -16,9 +16,10 @@ sudo pacman -S --needed --noconfirm python-build python-installer python-hatchli
 ( cd "$HERE/taninux" && makepkg -sf --noconfirm ) \
   && cp "$HERE/taninux/"*.pkg.tar.zst "$OUT/" && echo "   ok" || echo "   FAILED (taninux)"
 
-echo "==> AUR rebuilds: eww-git tiramisu-git waypaper calamares"
+AUR_PKGS="eww-git tiramisu-git waypaper calamares librewolf-bin arch-update timeshift-autosnap xdg-terminal-exec paru"
+echo "==> AUR rebuilds: $AUR_PKGS"
 tmp="$(mktemp -d)"
-for p in eww-git tiramisu-git waypaper calamares; do
+for p in $AUR_PKGS; do
   echo "  -- $p"
   if git clone --depth=1 "https://aur.archlinux.org/$p.git" "$tmp/$p" >/dev/null 2>&1 \
      && ( cd "$tmp/$p" && makepkg -sf --noconfirm ); then