docs(docs): document Bibata cursor package and GTK configuration

docs/desktop/index.mdx

@@ -29,7 +29,7 @@ Three Wayland compositors are configured side by side. niri is the original setu
 | Source | Packages |
 | --- | --- |
 | pacman | `niri`, `noctalia` (the CachyOS build where that repo is configured, else `extra`), `xwayland-satellite`, `polkit`, `polkit-gnome`, `uwsm`, `xdg-user-dirs`, Wayland utilities (`wl-clipboard`, `cliphist`, `wtype`, `ydotool`, `grim`, `slurp`, `hyprpicker`, `pamixer`, `brightnessctl`, `libnotify`), the bound apps (`nautilus`, `imv`, `mpv`, `evince`, `chromium`, `obsidian`), and strata's runtime deps |
-| AUR via `yay`/`paru` (a sync repo wins when it has the name) | `vicinae-bin`, `tldraw-offline-bin`, and the desktop apps `beeper-bin`, `fastmail`, `1password`, `brave-origin-bin`, `claude-desktop`, `spotify` |
+| AUR via `yay`/`paru` (a sync repo wins when it has the name) | `vicinae-bin`, `tldraw-offline-bin`, `bibata-cursor-translucent`, and the desktop apps `beeper-bin`, `fastmail`, `1password`, `brave-origin-bin`, `claude-desktop`, `spotify` |
 | `[omarchy]` repo, when configured | `herdr`, `flea`, `voxtype-bin`, `xdg-terminal-exec`, `hyprland-preview-share-picker` |
 | `[cachyos]` repo, when configured | `umbriel`, `xdg-desktop-portal-umbriel` |
 

docs/desktop/umbriel.mdx

@@ -35,7 +35,7 @@ Umbriel watches these files and applies a valid save immediately; `umbriel confi
 | Keyboard | `us`, repeat delay 400 ms, rate 50, NumLock on | niri |
 | Touchpad | natural scroll, tap, left-right-middle, sensitivity 1.0 | niri |
 | Tablet, touch | mapped to `eDP-1` | niri |
-| Cursor | `capitaine-cursors-light` 24, hidden while typing, follows keyboard focus (so scratchpads open on the output focus moved to) | niri, Umbriel |
+| Cursor | `Bibata_Ghost` (dark translucent Bibata, AUR `bibata-cursor-translucent`) 28, hidden while typing, follows keyboard focus (so scratchpads open on the output focus moved to). Umbriel exports it as `XCURSOR_THEME` and over XSETTINGS; GTK apps on Wayland read the GNOME settings instead, set once with `gsettings set org.gnome.desktop.interface cursor-theme Bibata_Ghost` and `… cursor-size 28` (dconf, not managed) | Umbriel |
 | Layout | gap 8, presets 0.333 / 0.5 / 0.667, new columns 1/3 on every output, focus never centers, a lone column centers | niri |
 | Appearance | corner radius 10, no shadows, wallpaper-only blur on every window, tab bar hidden for one tab | niri |
 | Activation | apps may focus and reveal their windows (`focus_on_activate`), e.g. Noctalia notification actions | niri `honor-xdg-activation-with-invalid-serial` |