fix(packages): rename syncthingtray-qt6, ship neofetch from localrepo

CI package check failed on main (400/402):

- syncthingtray-qt6 no longer exists in the AUR (RPC returns nothing);
  the qt6 build is now the official 'syncthingtray' package in extra/
  cachyos - rename it in packages.x86_64 and drop the dead
  AUR_MISSING entry from build-end4-deps.sh
- neofetch left the distro repos (only chaotic-neofetch-git remains);
  build the AUR package locally (7.1.0-2, PGP-verified against Dylan
  Araps' key) and commit it to localrepo/ with a reindexed local-aur
  db so both the CI check (file glob) and pacstrap ([local-aur]) work
- un-indent the package lists in build-end4-deps.sh: CI accepts
  repo-less packages via 'grep -qxF <name>' (exact whole-line match),
  which could never match indented names

Verified locally with an exact replica of the CI check: 402/402.

localrepo/build-end4-deps.sh

@@ -87,6 +87,9 @@ done
 info "═══ Step 2: Building AUR dependencies ═══"
 
 # ── Theming & appearance ─────────────────────────────────────────────────────
+# Entries in these lists must start at column 0: CI's package check accepts
+# repo-less packages via `grep -qxF <pkg>` against this file (exact whole-line
+# match), which silently never matched while the names were indented.
 AUR_THEMING=(
 adw-gtk-theme-git
 darkly-bin
@@ -111,7 +114,6 @@ AUR_TOOLS=(
 AUR_MISSING=(
 asciinema-agg
 davs2
-  syncthingtray-qt6
 varia
 woeusb-ng
 ttf-ms-fonts

packages.x86_64

@@ -322,7 +322,7 @@ starship
 sudo
 swaync
 syncthing
-syncthingtray-qt6
+syncthingtray
 syntax-highlighting
 syslinux
 systemd-resolvconf