chore(i3): assign only main browser to $ws_broswer

dot_config/i3/config.tmpl

@@ -376,12 +376,11 @@ for_window [class="(a|A)udacity"] floating enable, resize set 1200 600, move pos
 ## assign application to specific workspace
 ### Tips: Run `xprop` (command line tool) to retrieve class, instance and title.
 # Browser
-assign [class="(Navigator|librewolf)"] $ws_browser
 assign [class="(Navigator|zen)"] $ws_browser
-assign [class="firefox-developer-edition"] $ws_browser
-assign [class="Brave"] $ws_browser
+# NOTE: Other browsers are treated as supporting tools—
+#       not assigned to $ws_browser for convenience,
+#       so they open in the current workspace.
 assign [instance="track.toggl.com__timer"] $ws_util
-assign [class="(c|C)hromium"] $ws_browser
 
 # Terminal
 assign [title="Alacritty@tmux:default"] $ws_console