control centre, notification overhaul, and cleanup

One centred rofi panel (super+x, or the gear in the bar) now drives network,
bluetooth, audio, WireGuard, display, notifications, clipboard, emoji,
screenshots, wallpaper, the particle layer, the bar and power. The separate
per-function menus are gone.

dunst: icons and images were disabled outright (icon_position=off,
max_icon_size=0). Now icons resolve through Papirus, images render, progress
bars are styled, notifications gap and stack, and fullscreen windows are not
covered unless the message is critical. Volume up/down never notified at all;
they now show a stacking OSD with a progress bar.

Removed things that were broken or belonged to whoever this rice came from:
- vpn-launcher.sh (mullvad/openvpn) and dc-multivpn
- audio/bluetooth/network/power rofi menus, folded into the control centre
- untar-all, unzip-all, resetxdgportal (unreferenced)
- a sxhkd binding hardcoded to /home/sarthak/projects/scribe
- clipboard-manager.sh keyed off XDG_SESSION_TYPE, which is 'tty' here, so it
  only ever printed a Russian error; rewritten on greenclip
- toggle-bar.sh was bound to super+b but did not exist; written

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Cn3dHfbgNYdbZvzb1b3GQt

.config/dunst/dunstrc.pre-overhaul

@@ -0,0 +1,63 @@
+[global]
+monitor = 0
+follow = mouse
+shrink = no
+padding = 12
+horizontal_padding = 12
+
+width = 350
+height = (0, 150)
+offset = 12x45
+origin = top-right
+
+frame_width = 2
+separator_height = 1
+frame_color = "#92b9ea"
+separator_color = frame
+
+sort = no
+font = JetBrainsMono Nerd Font 10
+markup = full
+format = "[%a]\n<b>%s</b>\n%b"
+alignment = left
+show_age_threshold = 60
+word_wrap = yes
+ignore_newline = no
+stack_duplicates = true
+hide_duplicate_count = no
+show_indicators = yes
+
+icon_position = off
+max_icon_size = 0
+sticky_history = no
+history_length = 6
+title = Dunst
+class = Dunst
+corner_radius = 12
+
+mouse_left_click = close_current
+mouse_middle_click = do_action
+mouse_right_click = close_all
+
+[ignore_flameshot_warning]
+body = "grim's screenshot component is implemented based on wlroots, it may not be used in GNOME or similar desktop environments"
+format = ""
+
+[urgency_low]
+background = "#0f0d17"
+foreground = "#7f7796"
+frame_color = "#3d3752"
+timeout = 5
+
+[urgency_normal]
+default_icon = dialog-information
+background = "#0f0d17"
+foreground = "#e9eefb"
+frame_color = "#92b9ea"
+timeout = 5
+
+[urgency_critical]
+background = "#0f0d17"
+foreground = "#e0798f"
+frame_color = "#cf6a80"
+timeout = 0