docs: refresh README screenshots, links, and capability list (#1833)

Add Tutorials and Roadmap to the header link row, plus a Roadmap status
badge.

Replace the dashboard hero with the stack detail view showing the Drift
tab, and retake every screenshot at 1920x1080 in Dim, OLED, and Light.
The Dim grid stays visible by default; OLED and Light sit in collapsible
sections so the page stays short. All captures share one appearance
baseline: clean headings, signature charts, motion and effects off,
maximum ambient glow, blue accent.

Add three shipped capabilities that were documented but absent from the
list: Fleet Secrets and Fleet Sync under Fleet, and the host console
under Operations.

README.md

@@ -8,7 +8,9 @@
 
   <p>
     <a href="https://docs.sencho.io">Docs</a> ·
+    <a href="https://docs.sencho.io/tutorials">Tutorials</a> ·
     <a href="https://sencho.io">Website</a> ·
+    <a href="https://sencho.io/roadmap">Roadmap</a> ·
     <a href="https://github.com/studio-saelix/sencho/discussions">Discussions</a> ·
     <a href="https://github.com/sponsors/Studio-Saelix">Sponsor</a> ·
     <a href="https://buymeacoffee.com/sencho">Buy Me a Coffee</a>
@@ -23,14 +25,12 @@
   [![Open issues](https://img.shields.io/github/issues/studio-saelix/sencho)](https://github.com/studio-saelix/sencho/issues)
   [![Website](https://img.shields.io/website?url=https%3A%2F%2Fsencho.io&label=website)](https://sencho.io)
   [![Docs](https://img.shields.io/website?url=https%3A%2F%2Fdocs.sencho.io&label=docs)](https://docs.sencho.io)
+  [![Roadmap](https://img.shields.io/website?url=https%3A%2F%2Fsencho.io%2Froadmap&label=roadmap)](https://sencho.io/roadmap)
 </div>
 
 <br />
 
-<picture>
-  <source media="(prefers-color-scheme: dark)" srcset="docs/images/dashboard-dark.png">
-  <img src="docs/images/dashboard-light.png" alt="Sencho dashboard">
-</picture>
+<img src="docs/images/hero.png" alt="Sencho stack detail view showing the Drift tab for the cloudflared stack">
 
 > [!NOTE]
 > Sencho is used in production for day-to-day Docker Compose and fleet management. As a pre-1.0 project it still evolves quickly, so review the known limitations and validate against your own setup before deploying it on critical infrastructure.
@@ -80,6 +80,8 @@ Sencho is free, open-source software under AGPLv3. Everything below is included
 - [Fleet Federation](https://docs.sencho.io/features/fleet-federation): cordon nodes and pin Blueprints to specific hosts
 - [Fleet Actions](https://docs.sencho.io/features/fleet-actions): bulk label operations, fleet-wide stop-by-label, and fleet-wide prune
 - [Fleet Dossier](https://docs.sencho.io/features/fleet-dossier): export the whole fleet as a single browsable Markdown archive
+- [Fleet Secrets](https://docs.sencho.io/features/fleet-secrets): author environment-variable bundles once, push them to labeled nodes' stacks, with an audit trail of every change
+- [Fleet Sync](https://docs.sencho.io/features/fleet-sync): push scan policies, CVE suppressions, and misconfig acknowledgements from a control instance to its replicas
 - [Docker Label Audit](https://docs.sencho.io/features/docker-label-audit) across every node, for labels that drive external automation
 - [Remote updates](https://docs.sencho.io/features/remote-updates): pull the latest image and recreate any node in the fleet from the Fleet view, no SSH session required
 - Node labels and grouping
@@ -110,6 +112,7 @@ Sencho is free, open-source software under AGPLv3. Everything below is included
 - [Notification routing](https://docs.sencho.io/features/alerts-notifications#notification-routing) to Slack, Discord, and any generic webhook
 - [Global search](https://docs.sencho.io/features/global-search) across pages, nodes, and every stack in the fleet
 - [Resources view](https://docs.sencho.io/features/resources) for images, volumes, and networks with scoped prune actions
+- [Host console](https://docs.sencho.io/features/host-console): an interactive terminal on the host OS in the browser, no SSH session required
 
 ---
 
@@ -179,10 +182,34 @@ See the [multi-node guide](https://docs.sencho.io/features/multi-node) for the f
 
 | | |
 |---|---|
-| ![Stacks](docs/images/stacks.png) | ![Editor](docs/images/editor.png) |
-| ![Fleet](docs/images/fleet.png) | ![Logs](docs/images/logs.png) |
-| ![Security overview](docs/images/overview/security-overview.png) | ![Blueprints and drift](docs/images/overview/blueprint-deployments.png) |
-| ![Scheduled Operations](docs/images/overview/scheduled-operations.png) | ![Compose Doctor](docs/images/overview/compose-doctor.png) |
+| ![Stacks](docs/images/stacks-dim.png) | ![Editor](docs/images/editor-dim.png) |
+| ![Fleet](docs/images/fleet-dim.png) | ![Logs](docs/images/logs-dim.png) |
+| ![Security overview](docs/images/overview/security-overview-dim.png) | ![Blueprints and drift](docs/images/overview/blueprint-deployments-dim.png) |
+| ![Scheduled Operations](docs/images/overview/scheduled-operations-dim.png) | ![Compose Doctor](docs/images/overview/compose-doctor-dim.png) |
+
+<details>
+<summary>Same screens in OLED</summary>
+
+| | |
+|---|---|
+| ![Stacks](docs/images/stacks-oled.png) | ![Editor](docs/images/editor-oled.png) |
+| ![Fleet](docs/images/fleet-oled.png) | ![Logs](docs/images/logs-oled.png) |
+| ![Security overview](docs/images/overview/security-overview-oled.png) | ![Blueprints and drift](docs/images/overview/blueprint-deployments-oled.png) |
+| ![Scheduled Operations](docs/images/overview/scheduled-operations-oled.png) | ![Compose Doctor](docs/images/overview/compose-doctor-oled.png) |
+
+</details>
+
+<details>
+<summary>Same screens in Light</summary>
+
+| | |
+|---|---|
+| ![Stacks](docs/images/stacks-light.png) | ![Editor](docs/images/editor-light.png) |
+| ![Fleet](docs/images/fleet-light.png) | ![Logs](docs/images/logs-light.png) |
+| ![Security overview](docs/images/overview/security-overview-light.png) | ![Blueprints and drift](docs/images/overview/blueprint-deployments-light.png) |
+| ![Scheduled Operations](docs/images/overview/scheduled-operations-light.png) | ![Compose Doctor](docs/images/overview/compose-doctor-light.png) |
+
+</details>
 
 ---