docs: document soundtouch-web preset-saving UI (★ star and + button)

EXTERNAL-HOST-WALKTHROUGH.md — Step 7 "Via soundtouch-web":
  Replaced the single save path with two labelled options:
  - ★ Star button: appears in the Now Playing card's top-right corner,
    opens a slot picker (1–6), turns gold once mapped.
  - + button: appears on each preset tile on hover, saves directly to
    that slot without a picker.
  Added a one-liner on when to use each.

PRESET-QUICKSTART.md:
  New "Via soundtouch-web (browser UI)" section added above the CLI
  section, covering both the ★ star and + paths with step-by-step
  instructions.

soundtouch-web-roadmap.md:
  - Added a "Shipped" callout noting that preset-slot saving is done.
  - Retitled the Favorites section to "Favorites (device-native, distinct
    from presets)" and added a note clarifying it refers to the speaker's
    /favorites API (different from the 6 preset slots) which is still
    pending.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docs/content/docs/appendix/PRESET-QUICKSTART.md

@@ -7,7 +7,27 @@ sidebar:
 
 ## Overview
 
-SoundTouch devices support 6 preset slots that can store your favorite content for instant access. This guide shows you how to manage presets using both the CLI and Go library.
+SoundTouch devices support 6 preset slots that can store your favorite content for instant access. This guide shows you how to manage presets using the soundtouch-web UI, the CLI, or the Go library.
+
+## Via soundtouch-web (browser UI)
+
+**soundtouch-web** (default port **8080**) is the easiest way to manage presets without the command line.  Two save paths are available whenever content is playing:
+
+### ★ Star button — save from Now Playing
+
+1. Navigate to your speaker's detail page.
+2. Play any station or track (via Radio Browser, TuneIn, or the speaker's own sources).
+3. A semi-transparent **★** appears in the top-right corner of the **Now Playing** card.
+4. Click the star — a slot picker **1 · 2 · 3 · 4 · 5 · 6** opens.
+5. Click the target slot number.  The star turns gold once the current content is saved to at least one slot.
+
+### + button — save directly to a preset tile
+
+While something is playing, hover over any of the six **Preset** tiles.  A small **+** button appears in the tile's corner; clicking it saves the current content to that slot immediately (no picker needed).
+
+Use the **+** when you already know which slot you want; use the **★** when you want to pick the slot after you've decided to save.
+
+---
 
 ## Quick CLI Usage
 

docs/content/docs/appendix/soundtouch-web-roadmap.md

@@ -8,6 +8,12 @@ app's local-control functionality. Everything else in Stockholm (OAuth flows,
 setup wizard, service account linking, onboarding, analytics) is cloud
 infrastructure that is either shut down or already handled by soundtouch-service.
 
+> **Shipped:** Saving the current content to a preset slot (slots 1–6) is
+> already implemented — a ★ star button in the top-right corner of the Now
+> Playing card opens a slot picker, and a **+** button on each preset tile
+> saves to that slot directly.  See [PRESET-QUICKSTART.md](PRESET-QUICKSTART.md)
+> for usage details.
+
 ---
 
 ## 1. Seek / scrub
@@ -37,10 +43,16 @@ func (c *Client) Seek(positionSeconds int) error {
 
 ---
 
-## 2. Favorites
+## 2. Favorites (device-native, distinct from presets)
 
-Mark or unmark the currently playing track as a favourite directly from the
-Now Playing card.
+> **Note:** This section is about the speaker's **built-in** `/favorites` API —
+> a separate concept from the 6 preset slots.  Preset-slot saving (★ star /
+> **+** button) is already shipped; the native Favorites API is not yet
+> surfaced in soundtouch-web.
+
+Mark or unmark the currently playing track as a device favourite directly from
+the Now Playing card.  Unlike presets (maximum 6, numbered slots), the device
+can hold a larger favourites list; support varies by source.
 
 **Device API:**
 - `GET /favorites` — returns `<favorites>` list

docs/content/docs/guides/EXTERNAL-HOST-WALKTHROUGH.md

@@ -49,7 +49,8 @@ Check that the service is running:
 systemctl status soundtouch-service
 ```
 
-The Admin UI is now at **`http://<pi-ip>:8000`** — open it in a browser.
+The Admin UI is now at **`http://<pi-ip>`** (port 80: the Raspberry Pi
+installer defaults to port 80, not 8000) — open it in a browser.
 
 ### Other Linux hosts (systemd)
 
@@ -166,15 +167,40 @@ curl -s http://192.0.2.1:8090/sources
 
 ## Step 7 — Set up preset buttons (optional)
 
-### Via the AfterTouch web UI
+### Via soundtouch-web
 
-1. Open **`http://<host-ip>:8000`** and navigate to your speaker.
-2. Use the **Radio Browser** or **TuneIn** tab to find a station.
-3. Click the station to play it.
-4. Click **Store as preset → slot 1** (or whichever slot you want).
-5. Repeat for slots 2–6.
+The Radio Browser, TuneIn tabs, and preset saving live in
+**soundtouch-web**, a separate binary from the service. Run it on your
+host and open **`http://<host-ip>:8080`** in your browser (default port
+8080).
 
-### Via soundtouch-cli (any machine on the LAN)
+> **Raspberry Pi note:** The Raspberry Pi installer (`install.sh`) only
+> installs `soundtouch-service`. Download `soundtouch-web` separately from
+> the [Releases page](https://github.com/gesellix/Bose-SoundTouch/releases)
+> and start it alongside the service.
+
+soundtouch-web provides two ways to save what's currently playing to a
+preset slot:
+
+**★ Star button in the Now Playing card**
+
+1. Open **`http://<host-ip>:8080`** and navigate to your speaker.
+2. Use the **Radio Browser** or **TuneIn** tab to find a station and click
+   it to play.
+3. A semi-transparent **★** appears in the top-right corner of the
+   **Now Playing** card.  Click it — a slot picker (1–6) opens.  Select
+   the target preset number.  The star turns gold once the content is
+   mapped to at least one slot.
+4. Repeat for each station you want to save.
+
+**+ button on the preset grid**
+
+Alternatively, while something is playing you can hover over any of the six
+preset tiles in the **Presets** row.  A small **+** button appears in the
+corner of each tile; clicking it saves the current content directly to that
+slot.
+
+### Alternatively — storing presets via soundtouch-cli (any machine on the LAN)
 
 Download the CLI for your machine from the
 [Releases page](https://github.com/gesellix/Bose-SoundTouch/releases), then: