feat(quickshell): Alt+Tab overview of every monitor and workspace

Each monitor is a row of workspace cards at its own aspect ratio, with
live captures of the windows where they sit, including windows on
hidden workspaces. Alt+Tab opens it with the previous window picked,
further Tabs walk the focus history, and releasing Alt switches.
Super+W opens it without the hold. Hover, click, Enter and the
workspace digits work too.

Group cycling moves from Alt+Tab to Super+Tab and Super+Shift+Tab.

hypr/lua/binds/shell.lua

@@ -10,6 +10,14 @@ shell("lock", { key = mod .. " + CTRL + L", description = "lock screen" })
 shell("power", { key = mod .. " + P", description = "power menu" })
 shell("ask", { key = mod .. " + A", description = "ask claude" })
 shell("dashboard", { key = mod .. " + D", description = "dashboard" })
+shell("overview", { key = mod .. " + W", description = "overview of every workspace" })
+
+-- Alt+Tab: hold Alt, tap Tab through focus history, let go to switch. The
+-- overview sees the release itself; the release bind is a backstop for the
+-- case where Alt comes up before the overview has the keyboard.
+shell("overviewNext", { key = "ALT + Tab", description = "switch windows" })
+shell("overviewPrev", { key = "ALT + SHIFT + Tab", description = "switch windows, backwards" })
+hl.bind("ALT + ALT_L", hl.dsp.exec_cmd("qs ipc call shell overviewCommit"), { release = true })
 shell("toggleDnd", { key = mod .. " + SHIFT + N", description = "toggle do not disturb" })
 shell("toggleStayAwake", { key = mod .. " + SHIFT + I", description = "keep the screen awake" })
 shell("clearNotifications", { key = mod .. " + CTRL + SHIFT + N", description = "clear notifications" })