Add Obsidian to waybar, comment out nvidia-specific env vars

Add Obsidian as a waybar app launcher button alongside existing
launchers. Comment out nvidia-specific environment variables in
hypr/base.conf (LIBVA_DRIVER_NAME, GBM_BACKEND, etc.) so the
config works on all systems by default. Also includes prior
uncommitted changes: .gitignore updates, hyprpaper config,
package list updates, and various hypr config refinements.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

waybar/base.css

@@ -108,6 +108,21 @@ window#waybar {
     color: @color_tertiary;
 }
 
+/* App launcher buttons */
+#custom-steam,
+#custom-waterfox,
+#custom-discord,
+#custom-spotify,
+#custom-obsidian {
+    padding: 0 10px;
+    color: @color_primary;
+}
+
+#custom-steam {
+    margin-left: 8px;
+    border-left: 1px solid @color_tertiary;
+}
+
 #tray {
     padding: 0 8px;
     border-left: 1px solid @color_tertiary;