niri(blankpad): desk-profile system, keybind rework, lid handler, noctalia config tracked

- config.kdl: display include optional=true (desk profiles link it per-desk),
  new optional switch-events.kdl include (per-host, blankpad-only)
- keybinds: swap-window-left/right on Mod+CTRL+H/L+arrows (join/exit columns
  on pass), move-column demoted to Mod+CTRL+Alt+chords; Print trio -> flameshot
  full/gui/screen (CTRL+Shift trio kept); launcher Mod+CTRL+Return -> Mod+D;
  Alt+Tab noctalia window-switcher; Mod+V clipboard panel; Mod+Shift+Space
  handy post-process; Mod+Shift+D desk cycle
- layout: preset column widths 12.5/25/33/50/67/75/87.5%
- desk-1-home.kdl: EDID-identity-keyed positions (M34 + eDP long names; PM1601
  connector placeholder pending EDID capture), focus-at-startup M34-first
- desk-2-portable.kdl: skeleton, EDID capture TODO
- switch-events: lid-close -> noctalia session lock-and-suspend
- autostart: handy --start-hidden (replaces Handy self-autostart)
- noctalia config.toml + settings.toml now tracked
- zz-blankpad display.kdl retired to .AGENTTRASH (superseded by desk-1-home)
niri validate: pass (assembled blankpad layout)

dotfiles/zz-blankpad/niri/.config/niri/cfg/desk-1-home.kdl

@@ -0,0 +1,32 @@
+// ────────────── Desk Profile: home (current rig) ──────────────
+// Applied by symlinking this file to cfg/display.kdl (see scripts/desk.sh).
+// Panels are keyed by EDID identity (manufacturer model serial), NOT by
+// connector name — connector names reshuffle between desks; identity travels.
+//
+// requires: Sceptre Tech Inc Sceptre M34 Unknown
+// requires: Lenovo Group Limited 0x40A9 Unknown
+// optional: HDMI-A-1 (PM1601, dock-dependent)
+
+output "Sceptre Tech Inc Sceptre M34 Unknown" {
+    mode "3440x1440@239.999"
+    scale 1
+    transform "normal"
+    position x=1581 y=-600
+    focus-at-startup
+}
+
+// PM1601 portrait panel (dock-dependent). EDID string NOT captured as of
+// 2026-10-09 (panel disconnected) — connector-keyed placeholder.
+// When plugged in: run `desk.sh capture`, re-key this block to the printed
+// long name, update #optional above.
+output "HDMI-A-1" {
+    scale 1
+    transform "90"
+    position x=1200 y=0
+}
+
+output "Lenovo Group Limited 0x40A9 Unknown" {
+    scale 1.0
+    position x=5021 y=-240
+    focus-at-startup
+}