dunst: reload the running notifier when the mesh rewrites its file

A setting changed through mesh-controller.settings rewrote dunstrc, but the
running dunst kept the old font and width until the next login. Declare the
package's dunst.service in the account's manager, without a state, with
reload-on the configuration, so the node-engine runs its ExecReload
(dunstctl reload) and what is on screen stays. Add dunst_reload to do the
same on demand and say the font and width the files set.

modules/dunst/module.json

@@ -19,7 +19,8 @@
     "dunst_resume",
     "dunst_close_all",
     "dunst_rules",
-    "dunst_count"
+    "dunst_count",
+    "dunst_reload"
   ],
   "settings": {
     "font-size": {
@@ -64,7 +65,17 @@
       "path": "${machine:account-home}/.config/dunst/dunstrc",
       "owner": "${machine:account}",
       "mode": "0644",
-      "content": "# dunst, the notifier (module dunst, novox/hq ADR 0208). Owned by the mesh: this file is replaced\n# at every push. Adopted from the laptop's file of 2026-10-04 (the two workstations differed in\n# position, transparency and corner radius; the laptop's square, opaque, top-right one matches the\n# rest of the desktop). Only what differs from dunst's defaults, and what the desktop relies on.\n#\n# Other modules' rules go in ~/.config/dunst/dunstrc.d/*.conf, which dunst reads after this file,\n# so a drop-in outranks it. dunst is started by D-Bus on the first notification: nothing starts it.\n\n[global]\n    monitor = 0\n    follow = none\n\n    # Geometry\n    width = ${setting:width}\n    height = (0, 300)\n    origin = top-right\n    offset = (10, 50)\n    notification_limit = 20\n\n    progress_bar = true\n    progress_bar_height = 10\n    progress_bar_frame_width = 1\n    progress_bar_min_width = 150\n    progress_bar_max_width = 300\n\n    indicate_hidden = yes\n    transparency = 0\n    separator_height = 2\n    padding = 8\n    horizontal_padding = 8\n    text_icon_padding = 0\n    frame_width = 3\n    frame_color = \"#de5200\"\n    gap_size = 0\n    separator_color = frame\n    sort = yes\n    corner_radius = 0\n\n    # Text: the interface face (research 026/04)\n    font = Inter ${setting:font-size}\n    line_height = 0\n    markup = full\n    format = \"<b>%s</b>\\n%b\"\n    alignment = left\n    vertical_alignment = center\n    show_age_threshold = 60\n    ellipsize = middle\n    ignore_newline = no\n    stack_duplicates = true\n    hide_duplicate_count = false\n    show_indicators = yes\n\n    # Icons, from the desktop's icon theme\n    enable_recursive_icon_lookup = true\n    icon_theme = Adwaita\n    icon_position = left\n    min_icon_size = 32\n    max_icon_size = 128\n\n    # History\n    sticky_history = yes\n    history_length = 20\n\n    # The context menu is the node's dmenu-compatible command, which the holder of node-launcher\n    # answers (rofi on the workstations). Links open in the desktop's default browser.\n    dmenu = dmenu -p dunst\n    browser = /usr/bin/xdg-open\n    always_run_script = true\n\n    title = Dunst\n    class = Dunst\n    ignore_dbusclose = false\n\n    mouse_left_click = close_current\n    mouse_middle_click = do_action, close_current\n    mouse_right_click = close_all\n\n[urgency_low]\n    background = \"#000000\"\n    foreground = \"#ffffff\"\n    timeout = 10\n\n[urgency_normal]\n    background = \"#000000\"\n    foreground = \"#ffffff\"\n    timeout = 10\n\n[urgency_critical]\n    background = \"#000000\"\n    foreground = \"#ffffff\"\n    frame_color = \"#ff0000\"\n    timeout = 0\n"
+      "content": "# dunst, the notifier (module dunst, novox/hq ADR 0208). Owned by the mesh: this file is replaced\n# at every push. Adopted from the laptop's file of 2026-10-04 (the two workstations differed in\n# position, transparency and corner radius; the laptop's square, opaque, top-right one matches the\n# rest of the desktop). Only what differs from dunst's defaults, and what the desktop relies on.\n#\n# Other modules' rules go in ~/.config/dunst/dunstrc.d/*.conf, which dunst reads after this file,\n# so a drop-in outranks it. dunst is started by D-Bus on the first notification: nothing starts it.\n# When the mesh rewrites this file (a font-size or width setting changed), it tells a running dunst\n# to read it again (its unit's reload, dunstctl reload); what is on screen stays.\n\n[global]\n    monitor = 0\n    follow = none\n\n    # Geometry\n    width = ${setting:width}\n    height = (0, 300)\n    origin = top-right\n    offset = (10, 50)\n    notification_limit = 20\n\n    progress_bar = true\n    progress_bar_height = 10\n    progress_bar_frame_width = 1\n    progress_bar_min_width = 150\n    progress_bar_max_width = 300\n\n    indicate_hidden = yes\n    transparency = 0\n    separator_height = 2\n    padding = 8\n    horizontal_padding = 8\n    text_icon_padding = 0\n    frame_width = 3\n    frame_color = \"#de5200\"\n    gap_size = 0\n    separator_color = frame\n    sort = yes\n    corner_radius = 0\n\n    # Text: the interface face (research 026/04)\n    font = Inter ${setting:font-size}\n    line_height = 0\n    markup = full\n    format = \"<b>%s</b>\\n%b\"\n    alignment = left\n    vertical_alignment = center\n    show_age_threshold = 60\n    ellipsize = middle\n    ignore_newline = no\n    stack_duplicates = true\n    hide_duplicate_count = false\n    show_indicators = yes\n\n    # Icons, from the desktop's icon theme\n    enable_recursive_icon_lookup = true\n    icon_theme = Adwaita\n    icon_position = left\n    min_icon_size = 32\n    max_icon_size = 128\n\n    # History\n    sticky_history = yes\n    history_length = 20\n\n    # The context menu is the node's dmenu-compatible command, which the holder of node-launcher\n    # answers (rofi on the workstations). Links open in the desktop's default browser.\n    dmenu = dmenu -p dunst\n    browser = /usr/bin/xdg-open\n    always_run_script = true\n\n    title = Dunst\n    class = Dunst\n    ignore_dbusclose = false\n\n    mouse_left_click = close_current\n    mouse_middle_click = do_action, close_current\n    mouse_right_click = close_all\n\n[urgency_low]\n    background = \"#000000\"\n    foreground = \"#ffffff\"\n    timeout = 10\n\n[urgency_normal]\n    background = \"#000000\"\n    foreground = \"#ffffff\"\n    timeout = 10\n\n[urgency_critical]\n    background = \"#000000\"\n    foreground = \"#ffffff\"\n    frame_color = \"#ff0000\"\n    timeout = 0\n"
+    },
+    {
+      "id": "notifier",
+      "type": "service",
+      "unit": "dunst.service",
+      "scope": "user",
+      "user": "${machine:account}",
+      "reload-on": [
+        "configuration"
+      ]
     }
   ],
   "build": {