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- zz-blankpad display.kdl retired to .AGENTTRASH (superseded by desk-1-home)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/niri/.config/niri/cfg/layout.kdl

@@ -5,10 +5,13 @@
         background-color "transparent" // <- needed for noctalia-shell to set wallpaper
 
         preset-column-widths {
+            proportion 0.125
+            proportion 0.25
             proportion 0.33333
             proportion 0.5
             proportion 0.66667
-        proportion 0.875
+            proportion 0.75
+            proportion 0.875
     }
 
         struts {

dotfiles/niri/.config/niri/config.kdl

@@ -8,10 +8,11 @@ gestures {
 include "./cfg/autostart.kdl"
 include "./cfg/keybinds.kdl"
 include "./cfg/input.kdl"
-include "./cfg/display.kdl"
+include optional=true "./cfg/display.kdl"
 include "./cfg/layout.kdl"
 include "./cfg/rules.kdl"
 include "./cfg/misc.kdl"
+include optional=true "./cfg/switch-events.kdl"
 
 
 include "noctalia.kdl"