feat(trivalent): force gnome-libsecret password store

Chromium's password-store auto-detect falls back to the plaintext 'basic'
store under unrecognized desktops (XDG_CURRENT_DESKTOP=Hyprland). Ship a
conf.d drop-in that pins --password-store=gnome-libsecret so saved passwords
and cookie-encryption keys live in gnome-keyring, not plaintext on disk.

The wrapper (trivalent.sh) sources /etc/trivalent/trivalent.conf.d/*.conf and
appends CHROMIUM_FLAGS, so the drop-in is all that's needed.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: KernelFreeze

files/system/etc/trivalent/trivalent.conf.d/50-password-store.conf

@@ -0,0 +1,7 @@
+# Sourced by /usr/lib64/trivalent/trivalent.sh; appends to CHROMIUM_FLAGS.
+#
+# Force the gnome-libsecret (keyring) password store. Chromium's auto-detect
+# falls back to the plaintext "basic" store under unrecognized desktops
+# (XDG_CURRENT_DESKTOP=Hyprland), so pin libsecret to keep saved passwords and
+# cookie encryption keys in the gnome-keyring instead of on disk in plaintext.
+CHROMIUM_FLAGS+=" --password-store=gnome-libsecret"