sway: per-host overrides via host.conf and session-env

Adds a host_sway_dotfiles mechanism mirroring host_i3_dotfiles: hosts
drop a host.conf into ~/.config/sway/ to override sway settings, and
optionally a session-env file sourced by start-sway for per-host
environment variables. The base sway/config defines $terminal and
includes ~/.config/sway/host.conf; an empty placeholder ships with the
base profile so the include never warns on hosts without overrides.

nymph gets its own host.conf wrapping alacritty in prime-run (NVIDIA
PRIME offload), bumping gaps/corner_radius, and pinning workspaces to
eDP-1 / DP-1, plus a session-env exporting SWAY_UNSUPPORTED_GPU=1 and
WLR_DRM_DEVICES for the hybrid Intel+NVIDIA setup.

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

ansible/inventory/host_vars/nymph.yml

@@ -31,3 +31,11 @@ host_i3_dotfiles:
   - src: .config/wireplumber/wireplumber.conf.d/60-camera-priority.conf
     dest: .config/wireplumber/wireplumber.conf.d/60-camera-priority.conf
     mode: "0644"
+
+host_sway_dotfiles:
+  - src: .config/sway/host.conf
+    dest: .config/sway/host.conf
+    mode: "0644"
+  - src: .config/sway/session-env
+    dest: .config/sway/session-env
+    mode: "0644"

ansible/roles/profile_desktop_host/tasks/main.yml

@@ -19,3 +19,18 @@
     - "'i3' in (desktop_sessions_enabled | default([]))"
     - (host_i3_dotfiles | default([])) | length > 0
 
+- name: Copy host-specific sway dotfiles
+  tags: [dotfiles, dotfiles:desktop, dotfiles:host, sway]
+  ansible.builtin.copy:
+    src: "{{ playbook_dir }}/../dotfiles/{{ hostname }}/{{ item.src }}"
+    dest: "{{ user_home }}/{{ item.dest }}"
+    owner: "{{ username }}"
+    group: "{{ user_group }}"
+    mode: "{{ item.mode }}"
+  loop: "{{ host_sway_dotfiles | default([]) }}"
+  loop_control:
+    label: "{{ item.dest }}"
+  when:
+    - "'sway' in (desktop_sessions_enabled | default([]))"
+    - (host_sway_dotfiles | default([])) | length > 0
+