iso: fix packages.x86_64 (no inline comments; gstreamer-vaapi -> gst-plugin-va)

Inline comments after a package name broke kitty/flatpak (became invalid
names with trailing whitespace). gstreamer-vaapi was removed from Arch.
calamares is AUR-only -> commented pending a [tanin] rebuild decision.

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

iso/build-profile/airootfs/etc/calamares/branding/tanin/branding.desc

@@ -0,0 +1,24 @@
+---
+componentName: tanin
+welcomeStyleCalamares: true
+windowExpanding: normal
+
+strings:
+    productName:         TANINUX
+    shortProductName:    TANINUX
+    version:             camel
+    shortVersion:        camel
+    versionedName:       TANINUX (camel)
+    shortVersionedName:  TANINUX
+    bootloaderEntryName:  TANINUX
+    productUrl:          https://taninux.kgva.ch
+    supportUrl:          https://git.openbureau.ch/karim/taninux
+
+# Fuji palette for the installer sidebar (matches the desktop).
+style:
+    sidebarBackground:    "#0f0f0f"
+    sidebarText:          "#f0f0f0"
+    sidebarTextSelect:    "#a39ec4"
+    sidebarTextHighlight: "#a39ec4"
+
+# TODO: add productLogo (logo.png) + a slideshow (show.qml) for polish.