feat: add a compact icon-only top navigation toggle (#1363)

* feat: add a compact icon-only top navigation toggle

Add a browser-local "Top navigation labels" preference under Settings >
Appearance. With it off, the desktop top navigation renders icon-only;
each destination keeps an aria-label, gains a hover/focus tooltip, and
stays reachable from the command palette. The setting defaults on, so
current behavior is preserved, and the mobile navigation always keeps
its labels.

Also left-align the desktop nav (previously centered) and shorten the
longest nav label from "Auto-Update" to "Update" so the bar scans faster.

* feat: let the icon-only top nav be left or centered

Add a "Top navigation alignment" preference under Settings > Appearance
that appears only when top navigation labels are off. It places the
icon-only bar against the left edge (the default) or centered. With
labels on, the nav always stays left so the longer labels read from the
edge. The choice is browser-local and persists per device.

docs/features/appearance.mdx

@@ -49,5 +49,6 @@ Hero headings and featured names always render in Instrument Serif so the editor
 The **Display** group holds the remaining per-browser preferences:
 
 - **Density** switches between **Comfortable** (roomy rows, the default) and **Compact** (tighter rows and tiles that fit more on screen for dense dashboards).
+- **Top navigation labels** shows text labels beside the top navigation icons. Turn it off for an icon-only bar; the destinations stay reachable by hover tooltip, accessible name, and the command palette. On the phone layout the navigation always keeps its labels. With labels off, **Top navigation alignment** chooses whether the icon-only bar sits to the left or centered.
 - **Deploy progress** toggles live output streaming for deploy, restart, update, install, and Git operations, and **Progress style** chooses Modal or Inline presentation.
 - **Diff preview before save** toggles a side-by-side diff of compose and env edits before they are written to disk.

docs/features/auto-update-policies.mdx

@@ -33,7 +33,7 @@ When nothing is pending, the board renders a single Shield-icon panel with the h
 
 ## Workflow
 
-1. Open **Auto-Update** from the top nav strip.
+1. Open **Update** from the top nav strip.
 2. Skim the card grid. The badge tells you the risk at a glance: `Safe · patch` is green, `Review · minor` is amber, `Blocked · major` is red, and a digest-only rebuild on a non-semver tag shows the gray `Digest rebuild` badge.
 3. For a safe update, click **Apply now** on the card to pull and recreate the stack immediately.
 4. For a major bump, review the changelog preview and the upstream release notes. **Apply now** is disabled on the readiness board for blocked cards; to apply a major bump after review, use the stack's lifecycle **Update** action (right-click the stack in the sidebar, or open the kebab menu and choose **Update**, or click **Deploy** in the stack editor).

docs/features/global-search.mdx

@@ -25,7 +25,7 @@ The palette groups results into three sections.
 
 | Group | What it contains | What happens when you pick one |
 |-------|------------------|--------------------------------|
-| **Pages** | The same set of destinations the top bar shows you. Home, Fleet, Resources, App Store, and Logs always appear; Auto-Update and Schedules appear for admins; Console appears for admins on Admiral; Audit appears for any role on Admiral with the audit permission. | Navigates to that page |
+| **Pages** | The same set of destinations the top bar shows you. Home, Fleet, Resources, App Store, and Logs always appear; Update and Schedules appear for admins; Console appears for admins on Admiral; Audit appears for any role on Admiral with the audit permission. | Navigates to that page |
 | **Nodes** | Every node in your fleet, with a green dot for online and a grey dot for offline. The currently active node carries a small **ACTIVE** chip on the right. | Switches the active node without leaving the current page |
 | **Stacks** | Every compose stack on every online node, matched on the compose filename (extension included). | Switches to the stack's node and opens it in the editor |
 

docs/getting-started/introduction.mdx

@@ -34,7 +34,7 @@ The **Home** view is the default landing page. It is designed for a fast operati
 - The activity panel shows **Fleet Heartbeat** when remote nodes exist, or **Stack Restarts (7d)** on a local-only install.
 - **Recent Alerts** shows the latest notification feed and includes **Clear All Notifications** when there is anything to clear.
 
-The top navigation includes **Home**, **Fleet**, **Resources**, **App Store**, and **Logs** on the standard dashboard surface. Depending on license, role, and node context, it can also include **Auto-Update**, **Schedules**, **Console**, and **Audit**.
+The top navigation includes **Home**, **Fleet**, **Resources**, **App Store**, and **Logs** on the standard dashboard surface. Depending on license, role, and node context, it can also include **Update**, **Schedules**, **Console**, and **Audit**.
 
 ## Stack workspace
 

docs/getting-started/quickstart.mdx

@@ -107,7 +107,7 @@ You land on **Home**, the default operational view. The health masthead reports
 
 Below the stack table, **Configuration Status** summarizes notification delivery, alert rules, automation, account security, backups, host thresholds, and crash detection. The neighboring activity card shows **Fleet Heartbeat** when remote nodes exist, or **Stack Restarts (7d)** on a local-only install. **Recent Alerts** shows the latest notification feed and includes **Clear All Notifications** when there is anything to clear.
 
-On the local node, the top navigation includes **Home**, **Fleet**, **Resources**, **App Store**, and **Logs**. Depending on license, role, and node context, it can also include **Auto-Update**, **Schedules**, **Console**, and **Audit**; hub-only views are hidden when a remote node is active. The right side of the top bar holds global search, notifications, and the profile menu entries **Settings**, **Documentation**, **Feedback**, **Appearance**, and **Log Out**.
+On the local node, the top navigation includes **Home**, **Fleet**, **Resources**, **App Store**, and **Logs**. Depending on license, role, and node context, it can also include **Update**, **Schedules**, **Console**, and **Audit**; hub-only views are hidden when a remote node is active. The right side of the top bar holds global search, notifications, and the profile menu entries **Settings**, **Documentation**, **Feedback**, **Appearance**, and **Log Out**.
 
 The left sidebar is the stack workspace. Below the Sencho brand, it starts with the node switcher, then **Create Stack**, a bulk-mode toggle, and **Scan stacks folder** for importing Compose projects added outside Sencho. Use **Search stacks...** with the **All**, **Up**, **Down**, and **Updates** chips to narrow the list. On a fresh install the stack list is empty until you create a stack or scan a populated `COMPOSE_DIR`.