Make rollback a GRUB snapshot reboot

Updates leads with “Boot a snapshot from GRUB (BOS snapshots)”
and links to Snapshots. Snapshots is the list to pick in GRUB,
not snapper rollback.

frontend/src/lib/nav.ts

@@ -0,0 +1,3 @@
+/** Sidebar page switch. Set from +page.svelte; views call it to jump. */
+export type Navigate = (page: string) => void;
+export const NAVIGATE_KEY = "bos-settings-navigate";

frontend/src/lib/views/Snapshots.svelte

@@ -42,7 +42,7 @@
 		if (!selected) return;
 		if (
 			confirm(
-				`Boot into snapshot #${selected}? Snapshots on BOS are booted directly from the GRUB menu (under "BOS snapshots"), not rolled back in place. Reboot now and pick this snapshot there.`,
+				`Reboot to pick snapshot #${selected} in GRUB? BOS boots snapshots from the GRUB “BOS snapshots” submenu. This does not run snapper rollback.`,
 			)
 		) {
 			invoke("reboot_system");
@@ -62,9 +62,10 @@
 </script>
 
 <ViewScaffold title="Snapshots">
+	<Hint text="This is how you undo a bad update: reboot and pick the snapshot in GRUB (BOS snapshots)." />
 	<Group
-		title="System snapshots"
+		title="What to pick in GRUB"
-		hint="Created automatically by snap-pac on each pacman transaction. Boot into one from the GRUB menu to recover; delete old ones here."
+		hint="Number, date, and description match the GRUB “BOS snapshots” submenu. Reboot, then choose that entry. This page does not run snapper rollback."
 		wide
 	>
 		<div class="list">
@@ -75,6 +76,11 @@
 			{:else if snapshots.length === 0}
 				<EmptyState icon={History} title="No snapshots yet" hint="Snapshots are created automatically on every pacman transaction." />
 			{:else}
+				<div class="row header" aria-hidden="true">
+					<span class="number">#</span>
+					<span class="date">Date</span>
+					<span class="desc">Description</span>
+				</div>
 				{#each snapshots as snap (snap.number)}
 					<button
 						class="row"
@@ -91,7 +97,7 @@
 
 		<div class="btn-row">
 			<button onclick={refresh}>Refresh</button>
-			<button disabled={!selected} onclick={bootIntoSelected}>Boot into selected…</button>
+			<button disabled={!selected} onclick={bootIntoSelected}>Reboot to pick in GRUB</button>
 			<button class="destructive" disabled={!selected} onclick={deleteSelected}>Delete selected</button>
 		</div>
 	</Group>
@@ -121,7 +127,15 @@
 		min-width: 0;
 	}
 
-	.row:hover {
+	.row.header {
+		background: transparent;
+		cursor: default;
+		opacity: 0.55;
+		font-size: var(--font-size-secondary, 12px);
+		padding-top: 0;
+	}
+
+	.row:hover:not(.header) {
 		background-color: color-mix(in srgb, var(--surface), var(--on-surface) 8%);
 	}
 

frontend/src/lib/views/Updates.svelte

@@ -1,5 +1,5 @@
 <script lang="ts">
-	import { onMount } from "svelte";
+	import { getContext, onMount } from "svelte";
 	import { invoke } from "@tauri-apps/api/core";
 	import { runStreamed } from "$lib/streaming";
 	import ViewScaffold from "$lib/components/ViewScaffold.svelte";
@@ -7,9 +7,12 @@
 	import Hint from "$lib/components/Hint.svelte";
 	import EmptyState from "$lib/components/EmptyState.svelte";
 	import LogView from "$lib/components/LogView.svelte";
+	import { NAVIGATE_KEY, type Navigate } from "$lib/nav";
 	import Download from "@lucide/svelte/icons/download";
 	import Cpu from "@lucide/svelte/icons/cpu";
 
+	const navigate = getContext<Navigate | undefined>(NAVIGATE_KEY);
+
 	interface PendingUpdate {
 		name: string;
 		current: string;
@@ -156,9 +159,13 @@
 
 	<Group
 		title="Rollback"
-		hint="BOS pins GRUB to rootflags=subvol=@, so snapper rollback does not change the running root. Boot a snapshot from the GRUB “BOS snapshots” submenu (grub-btrfs), or use the Snapshots page to reboot and pick one there."
+		hint="Boot a snapshot from GRUB (BOS snapshots)."
 	>
+		<Hint text="Snapshots lists number, date, and description so you know which GRUB entry to pick. snapper rollback will not change what GRUB boots (rootflags=subvol=@)." />
 		<Hint text="Bakery also has bakery rollback <pkg> for a single ecosystem binary — that is not a system rollback." />
+		<div class="btn-row">
+			<button disabled={!navigate} onclick={() => navigate?.("snapshots")}>Open Snapshots</button>
+		</div>
 	</Group>
 
 	<LogView lines={log} />

frontend/src/routes/+page.svelte

@@ -1,14 +1,18 @@
 <script lang="ts">
-	import { onMount } from "svelte";
+	import { onMount, setContext } from "svelte";
 	import { listen } from "@tauri-apps/api/event";
 	import Sidebar from "$lib/components/Sidebar.svelte";
 	import Placeholder from "$lib/components/Placeholder.svelte";
 	import { DEFAULT_PAGE } from "$lib/sidebar";
+	import { NAVIGATE_KEY, type Navigate } from "$lib/nav";
 	import { initTheme } from "$lib/theme";
 	import { VIEWS } from "$lib/views/registry";
 
 	let activePage = $state(DEFAULT_PAGE);
 	let ActiveView = $derived(VIEWS[activePage]);
+	setContext<Navigate>(NAVIGATE_KEY, (page) => {
+		activePage = page;
+	});
 
 	onMount(() => {
 		initTheme();