Migrate to chezmoi with per-host sway/waybar configs

- Restructure repo into chezmoi source layout (dot_ prefix)
- Add .chezmoi.toml.tmpl mapping hostname to hosttype (laptop/desktop)
- Template sway config.d fragments (outputs/inputs/binds) per host
- Template waybar config.jsonc with shared bar/module definitions
- Host-scope pulsemeeter (flow) and teams-for-linux (desktop hosts) via .chezmoiignore
- Trim install.sh package lists to configured software + config deps
- Remove stale kitty.conf.bak and untracked host fragments

dot_config/environment.d/theme.conf

@@ -0,0 +1,4 @@
+GTK_THEME=Adwaita:dark
+#GTK2_RC_FILES=/usr/share/themes/Adwaita-dark/gtk-2.0/gtkrc
+#QT_STYLE_OVERRIDE=Adwaita-Dark
+QT_QPA_PLATFORMTHEME=qt6ct