sway: deploy start-sway system-wide and fix runtime warnings

- Move start-sway to /usr/local/bin so emptty resolves it without a user
  PATH (it runs the launcher with an absolute path). The role copies the
  script as root; the user dotfile entry is removed.
- Fix runtime errors / deprecations in sway/config: tiling_drag accepts
  only enable|disable|toggle; new_window / new_float have been
  superseded by default_border / default_floating_border.
- Simplify workspace names to numeric only; waybar already maps them to
  roman numerals via format-icons.
- Update cleanup-sway.sh to remove /usr/local/bin/start-sway and the
  emptty session entry together as system files.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

ansible/roles/profile_desktop_sway/files/sway.desktop

@@ -1,5 +1,5 @@
 [Desktop Entry]
 Name=Sway
 Comment=SwayFX (Wayland)
-Exec=start-sway
+Exec=/usr/local/bin/start-sway
 Type=Application