feat(engine): opt Profile / Leaderboard / Home into scrim-click dismiss

Follow-up to a54201e. The previous commit added ScrimDismissible to
Stats, Achievements, and Help; this one extends the same one-line
opt-in to the remaining three read-only modals so the click-outside-
to-close gesture is consistent across every informational surface.

Each modal now has the same shape: capture the scrim from
spawn_modal, attach ScrimDismissible after the build closure
returns. Three lines per file plus the import; no behaviour change
to the modal content itself.

Settings, Onboarding, Pause, Forfeit confirm, ConfirmNewGame, and
the win/game-over modals continue to opt OUT — all carry unsaved
or destructive state where an accidental scrim click would lose
work.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

solitaire_engine/src/leaderboard_plugin.rs

@@ -21,6 +21,7 @@ use crate::settings_plugin::SettingsResource;
 use crate::sync_plugin::SyncProviderResource;
 use crate::ui_modal::{
     spawn_modal, spawn_modal_actions, spawn_modal_button, spawn_modal_header, ButtonVariant,
+    ScrimDismissible,
 };
 use crate::ui_theme::{
     ACCENT_PRIMARY, BORDER_SUBTLE, STATE_INFO, TEXT_PRIMARY, TEXT_SECONDARY, TYPE_BODY,
@@ -392,7 +393,7 @@ fn spawn_leaderboard_screen(
     remote_available: bool,
     font_res: Option<&FontResource>,
 ) {
-    spawn_modal(commands, LeaderboardScreen, Z_MODAL_PANEL, |card| {
+    let scrim = spawn_modal(commands, LeaderboardScreen, Z_MODAL_PANEL, |card| {
         spawn_modal_header(card, "Leaderboard", font_res);
 
         // Subhead — what the screen does + what the buttons control.
@@ -566,6 +567,8 @@ fn spawn_leaderboard_screen(
             );
         });
     });
+    // Leaderboard is read-only — opt into click-outside-to-dismiss.
+    commands.entity(scrim).insert(ScrimDismissible);
 }
 
 fn header_cell(parent: &mut ChildSpawnerCommands, text: &str, width: f32, font: &TextFont) {