新增 niri/dms/gtk/qt/cava/fcitx5 等配置并添加 .gitignore

- 纳入版本管理: niri/(含 dms/), DankMaterialShell/, environment.d/,
  cava/, gtk-3.0/, gtk-4.0/, qt5ct/, qt6ct/, fcitx5/
- 新增 .gitignore: 排除 *.bak/*.backup*、fcitx5/conf/cached_layouts、
  DankMaterialShell 运行时标志
- 同步已有的 kitty/nvim/.zshrc 修改

gtk-3.0/dank-colors.css

@@ -0,0 +1,48 @@
+/*
+* GTK Colors
+* Generated with Matugen
+*/
+
+/* via thairanaru on GitHub: */
+
+/* Destructive colors are basically error colors */
+@define-color destructive_bg_color #f2b8b5;
+@define-color destructive_fg_color #601410;
+/* Follow material spec */
+@define-color error_bg_color #f2b8b5;
+@define-color error_fg_color #601410;
+/* Follow material spec (also I think looks nicer) */
+@define-color accent_fg_color #000000;
+@define-color accent_bg_color #42a5f5;
+/* Use surface instead of background */
+@define-color window_bg_color #101418;
+@define-color window_fg_color #e0e2e8;
+/* Make it more similar to Adwaita */
+@define-color view_bg_color #101418;
+@define-color view_fg_color #e0e2e8;
+@define-color headerbar_bg_color #101418;
+@define-color headerbar_fg_color #e0e2e8;
+@define-color sidebar_bg_color #1d2024;
+@define-color sidebar_fg_color #e0e2e8;
+/* There is only like one application I know that uses this, and there isn't a good way to get
+a color between surface and surface container so I think just giving this surface is a good enough fallback*/
+@define-color secondary_sidebar_bg_color #101418;
+@define-color secondary_sidebar_fg_color #e0e2e8;
+@define-color card_bg_color #1d2024;
+@define-color card_fg_color #e0e2e8;
+@define-color overview_bg_color #1d2024;
+@define-color overview_fg_color #e0e2e8;
+@define-color popover_bg_color #1d2024;
+@define-color popover_fg_color #e0e2e8;
+@define-color dialog_bg_color #101418;
+@define-color dialog_fg_color #e0e2e8;
+
+/* Backdrop/unfocused states - prevents white flash on window unfocus */
+@define-color headerbar_backdrop_color @window_bg_color;
+@define-color sidebar_backdrop_color @sidebar_bg_color;
+@define-color theme_unfocused_fg_color @window_fg_color;
+@define-color theme_unfocused_text_color @view_fg_color;
+@define-color theme_unfocused_bg_color @window_bg_color;
+@define-color theme_unfocused_base_color @window_bg_color;
+@define-color theme_unfocused_selected_bg_color @accent_bg_color;
+@define-color theme_unfocused_selected_fg_color @accent_fg_color;

gtk-3.0/settings.ini

@@ -0,0 +1,2 @@
+[Settings]
+gtk-icon-theme-name=Adwaita