unify color palette, harden shikane service, misc sway/opencode updates

sway:
- config: re-apply shikane profile after every reload
  (exec_always shikanectl reload); restart waybar on reload
  (exec_always pkill+waybar); enable default_border pixel 2;
  add tlpctl power-saver at startup
- keybinds: disable floating_modifier (was "$mod normal") -
  experiment for windows popping out via accidental mod+click
- windows: case-insensitive pydm title match for floating rule
- swayfx + waybar style: unified 5-color palette (base00-0F) with
  doc headers; waybar theme restyled to match the sway palette
- waybar config: scratchpad module in left bar, "S{count}" format
- new quickshell shell.qml bar

systemd user units:
- shikane.service: bind to graphical-session/sway-session targets,
  Type=simple, Restart=on-failure (2s) with start limits so crashes
  recover without giving up permanently
- new sway-session.target and its wants/ symlinks

opencode:
- load AGENTS.md as instructions (new file)
- move OpenWebUI API key from hardcoded to {env:OPENWEBUI_API_KEY}

.config/sway/config

@@ -35,6 +35,8 @@ include ~/.config/sway/config.d/*
 bindswitch --reload --locked lid:on output $laptop disable
 bindswitch --reload --locked lid:off output $laptop enable
 exec_always --no-startup-id '/home/work/.config/sway/scripts/clamshell-mode.sh'
+# Re-apply shikane display profile (scaling) after every sway reload
+exec_always --no-startup-id shikanectl reload
 
 #input "1267:12792:ELAN067B:00_04F3:31F8_Touchpad" {
 #    dwt enabled
@@ -55,17 +57,18 @@ seat seat0 xcursor_theme Adwaita 35
 exec systemctl --user start xdg-desktop-portal-wlr.service
 #exec pipewire
 exec swaync
-exec shikane
+exec_always --no-startup-id pkill -x waybar; waybar -c ~/.config/sway/waybar/config.jsonc -s ~/.config/sway/waybar/style.css
 exec nm-applet
 exec blueman-applet
 exec hypridle
 
 exec systemctl --user start hyperolkitagent
-exec waybar -c ~/.config/sway/waybar/config.jsonc -s ~/.config/sway/waybar/style.css
 exec flatpak run com.github.wwmm.easyeffects -w
 exec xrdb -merge ~/.Xresources
 exec wl-paste -t text --watch clipman store --no-persist
 
+exec tlpctl power-saver
+
 #exec gsettings set org.gnome.desktop.interface color-scheme "prefer-dark"
 
 #exec mpd
@@ -90,7 +93,7 @@ bindsym $mod+Ctrl+y      exec : | wl-copy -p
 #better audio
 #exec easyeffects -w -l Laptop 
 
-#default_border pixel 2
+default_border pixel 2
 #default_floating_border pixel 2
 exec systemctl --user import-environment XDG_SESSION_TYPE XDG_CURRENT_DESKTOP WAYLAND_DISPLAY SWAYSOCK
 exec dbus-update-activation-environment --systemd WAYLAND_DISPLAY DISPLAY SWAYSOCK XDG_CURRENT_DESKTOP=sway XDG_SESSION_DESKTOP=sway