fix: push notification toggle, textarea resize, mobile viewport, card alignment

1. Fix push toggle error: VAPID key field name mismatch (public_key → vapid_public_key)
2. Fix textarea auto-resize: proper height reset, overflow handling, mobile Enter
   inserts newline instead of sending (send via button on mobile)
3. Fix mobile viewport overflow: add overflow-x hidden to html/body, overflow-x
   hidden on content container
4. Fix dashboard cards: always 4 columns with responsive text sizing

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

web/src/app.css

@@ -20,6 +20,10 @@
 }
 
 @layer base {
+	html, body {
+		overflow-x: hidden;
+		max-width: 100vw;
+	}
 	body {
 		font-family: 'DM Sans', sans-serif;
 		background-color: var(--bg-primary);

web/src/lib/api/client.ts

@@ -223,7 +223,7 @@ export const push = {
 		request<{ id: number; message: string }>('POST', '/api/push/subscribe', subscription),
 	unsubscribe: (endpoint: string) =>
 		request<{ message: string }>('DELETE', '/api/push/subscribe', { endpoint }),
-	vapidKey: () => request<{ public_key: string }>('GET', '/api/push/vapid-key')
+	vapidKey: () => request<{ vapid_public_key: string }>('GET', '/api/push/vapid-key')
 };
 
 // User profile

web/src/lib/components/ComposeForm.svelte

@@ -55,20 +55,29 @@
 
 	function autoResize() {
 		if (!textareaEl) return;
-		textareaEl.style.height = 'auto';
+		// Reset to measure true scrollHeight
+		textareaEl.style.height = '80px';
 		const maxHeight = 240; // ~12 lines
 		const scrollHeight = textareaEl.scrollHeight;
 		if (scrollHeight > maxHeight) {
 			textareaEl.style.height = maxHeight + 'px';
 			textareaEl.style.overflowY = 'auto';
+			textareaEl.classList.remove('overflow-hidden');
 		} else {
-			textareaEl.style.height = scrollHeight + 'px';
+			textareaEl.style.height = Math.max(80, scrollHeight) + 'px';
 			textareaEl.style.overflowY = 'hidden';
+			textareaEl.classList.add('overflow-hidden');
 		}
 	}
 
+	function isMobile(): boolean {
+		return typeof window !== 'undefined' && window.innerWidth < 768;
+	}
+
 	function handleKeydown(e: KeyboardEvent) {
-		if (e.key === 'Enter' && !e.shiftKey) {
+		// On mobile, Enter inserts newline (send via button only)
+		// On desktop, Enter sends, Shift+Enter inserts newline
+		if (e.key === 'Enter' && !e.shiftKey && !isMobile()) {
 			e.preventDefault();
 			handleSubmit();
 		}
@@ -161,9 +170,9 @@
 	<!-- Message body -->
 	<textarea
 		bind:this={textareaEl}
-		placeholder="Write a message..."
-		class="w-full px-4 py-3 bg-transparent text-sm text-text-primary placeholder-text-secondary resize-none outline-none"
-		style="min-height: 72px; max-height: 240px;"
+		placeholder="Write a message... {isMobile() ? '' : '(Shift+Enter for new line)'}"
+		class="w-full px-4 py-3 bg-transparent text-sm text-text-primary placeholder-text-secondary resize-none outline-none overflow-hidden"
+		style="min-height: 80px; max-height: 240px;"
 		bind:value={body}
 		rows="3"
 		onkeydown={handleKeydown}

web/src/routes/+layout.svelte

@@ -101,7 +101,7 @@
 {:else if $user}
 	<div class="h-screen flex overflow-hidden bg-bg-primary">
 		<Sidebar open={sidebarOpen} onclose={() => (sidebarOpen = false)} />
-		<div class="md:ml-[260px] flex-1 flex flex-col min-w-0">
+		<div class="md:ml-[260px] flex-1 flex flex-col min-w-0 overflow-x-hidden">
 			<Header onMenuToggle={() => (sidebarOpen = !sidebarOpen)} />
 			<main class="flex-1 overflow-y-auto flex flex-col">
 				{@render children()}

web/src/routes/+page.svelte

@@ -91,7 +91,7 @@
 	});
 </script>
 
-<div class="p-5 max-w-6xl">
+<div class="p-3 md:p-5 max-w-6xl w-full">
 	<!-- Top bar -->
 	<div class="flex items-center justify-between mb-5">
 		<div>
@@ -120,22 +120,22 @@
 	{/if}
 
 	<!-- Summary Cards -->
-	<div class="grid grid-cols-2 md:grid-cols-4 gap-3 mb-5">
-		<div class="card p-4">
-			<p class="text-xs text-text-secondary mb-1">Total Messages</p>
-			<p class="text-2xl font-bold text-text-primary font-display">{loadingData ? '-' : summary.total_messages}</p>
+	<div class="grid grid-cols-4 gap-2 md:gap-3 mb-5">
+		<div class="card p-3 md:p-4">
+			<p class="text-[10px] md:text-xs text-text-secondary mb-1">Messages</p>
+			<p class="text-lg md:text-2xl font-bold text-text-primary font-display">{loadingData ? '-' : summary.total_messages}</p>
 		</div>
-		<div class="card p-4">
-			<p class="text-xs text-text-secondary mb-1">Agents</p>
-			<p class="text-2xl font-bold text-text-primary font-display">{loadingData ? '-' : summary.total_agents}</p>
+		<div class="card p-3 md:p-4">
+			<p class="text-[10px] md:text-xs text-text-secondary mb-1">Agents</p>
+			<p class="text-lg md:text-2xl font-bold text-text-primary font-display">{loadingData ? '-' : summary.total_agents}</p>
 		</div>
-		<div class="card p-4">
-			<p class="text-xs text-text-secondary mb-1">Channels</p>
-			<p class="text-2xl font-bold text-text-primary font-display">{loadingData ? '-' : summary.total_channels}</p>
+		<div class="card p-3 md:p-4">
+			<p class="text-[10px] md:text-xs text-text-secondary mb-1">Channels</p>
+			<p class="text-lg md:text-2xl font-bold text-text-primary font-display">{loadingData ? '-' : summary.total_channels}</p>
 		</div>
-		<div class="card p-4">
-			<p class="text-xs text-text-secondary mb-1">Conversations</p>
-			<p class="text-2xl font-bold text-text-primary font-display">{loadingData ? '-' : recentConversations.length}</p>
+		<div class="card p-3 md:p-4">
+			<p class="text-[10px] md:text-xs text-text-secondary mb-1">Convos</p>
+			<p class="text-lg md:text-2xl font-bold text-text-primary font-display">{loadingData ? '-' : recentConversations.length}</p>
 		</div>
 	</div>
 

web/src/routes/settings/+page.svelte

@@ -108,7 +108,7 @@
 				const reg = await navigator.serviceWorker.ready;
 				const sub = await reg.pushManager.subscribe({
 					userVisibleOnly: true,
-					applicationServerKey: urlBase64ToUint8Array(keyRes.public_key)
+					applicationServerKey: urlBase64ToUint8Array(keyRes.vapid_public_key)
 				});
 				const subJson = sub.toJSON();
 				await pushApi.subscribe({