Fix#1: Replace hardcoded 185px deskbar-offset in client.c and events.c with
DESKBAR_W constant (200) to eliminate the 15px gap between the WM frame and
deskbar edge.
Fix#2: Add Shift+Alt+Tab reverse-direction support — grab Mod1+Shift+XK_Tab
in wm.c, detect ShiftMask in events.c, and implement switcher_prev() in
switcher.c.
Fix#3: Include minimized windows in the Alt+Tab switcher. swl_populate() no
longer skips minimized clients; swl_mini[] tracks state so switcher_draw()
can dim them with bracketed titles and darker card backgrounds.
Fix#4: Rewrite themes/picom.conf with macOS-inspired settings — 10px corner
radius on normal windows, 8px on menus, soft downward shadow (radius 18,
offset-y 8, opacity 0.35), smooth fading (step 0.08), no dock/tray rounding.
Fix#5: Add per-app right-click context menu to the deskbar. Right-clicking
an app row opens a popup with Raise / Minimize / Close actions (Close shown
in red). Actions are sent as EWMH client messages (_NET_ACTIVE_WINDOW,
WM_CHANGE_STATE+IconicState, _NET_CLOSE_WINDOW) with matching handlers added
to the WM's on_client_message. Pointer grab closes the menu on any outside
click.