feat: poll server data so shared pages stay near-live

Refetch the current page every 15s while the tab is visible, gated by a
pure refresh policy: edit pages, hidden or offline tabs and in-flight
navigations are left alone. Replaces refresh-on-refocus with auto-refresh.

1 files changed, 0 insertions, 46 deletions

diff --git a/src/lib/refresh-on-refocus.ts b/src/lib/refresh-on-refocus.ts
deleted file mode 100644
index fcb042a..0000000
--- a/src/lib/refresh-on-refocus.ts
+++ /dev/null
@@ -1,46 +0,0 @@
-import { invalidateAll } from '$app/navigation';
-import { page } from '$app/stores';
-import { get } from 'svelte/store';
-
-// Skip the refocus refresh on login and edit pages (in-progress edits).
-const EXCLUDED_ROUTES: Record<string, true> = {
-	'/login': true,
-	'/grocery/[id]': true,
-	'/projects/[projectId]/routine/[routineId]': true,
-};
-
-const MIN_AWAY_MS = 10_000;
-
-/** Re-run page loads on refocus after MIN_AWAY_MS away; call from onMount. */
-export function refreshOnRefocus(): () => void {
-	let deactivatedAt: number | null = null;
-
-	const deactivate = () => {
-		deactivatedAt ??= Date.now();
-	};
-
-	const activate = () => {
-		if (deactivatedAt === null || document.visibilityState !== 'visible')
-			return;
-		const awayMs = Date.now() - deactivatedAt;
-		deactivatedAt = null;
-		if (awayMs < MIN_AWAY_MS) return;
-		if ((get(page).route.id ?? '') in EXCLUDED_ROUTES) return;
-		invalidateAll();
-	};
-
-	const onVisibilityChange = () => {
-		if (document.visibilityState === 'hidden') deactivate();
-		else activate();
-	};
-
-	document.addEventListener('visibilitychange', onVisibilityChange);
-	window.addEventListener('blur', deactivate);
-	window.addEventListener('focus', activate);
-
-	return () => {
-		document.removeEventListener('visibilitychange', onVisibilityChange);
-		window.removeEventListener('blur', deactivate);
-		window.removeEventListener('focus', activate);
-	};
-}