feat: add assistant board styling tools

apps/docs/docs/management/assistant.mdx

@@ -133,6 +133,18 @@ App creation uses Homarr's native app form inside the conversation. The form reu
 including automatic matching and searches through the `icon.findIcons` procedure, before the final
 `app.create` approval is requested. The model is instructed not to invent external icon CDN URLs.
 
+Board appearance changes use a similar review flow. The assistant first reads the board's current settings,
+including its complete custom stylesheet, and then opens an editable form with Custom CSS, Appearance,
+Background, and General tabs. The form highlights how many fields were proposed, preserves settings the
+assistant did not change, and returns only values that differ from the current board. Custom CSS can be
+copied or restored before continuing, and Homarr warns when it contains an imported stylesheet or remote
+resource URL. Continuing from the form opens the normal mutation approval before anything is saved.
+
+Ask for changes such as “make the cards denser on my Home board,” “add a mobile CSS rule without removing
+my existing styles,” or “change the board colors and disable app status checks.” The current user must have
+modify permission on the selected board. The empty conversation includes an **Improve a dashboard** starter,
+and `/style` prepares the same guided workflow from the composer.
+
 Homarr also exposes a small set of browser-only actions to the assistant. These actions can navigate to
 safe internal routes and open Homarr interfaces such as the command menu and media request search.
 They never receive provider credentials and cannot navigate to arbitrary external URLs.

apps/docs/docs/management/boards/index.mdx

@@ -142,6 +142,10 @@ Change the radius of your items / categories.
 This is the field where you can enter custom CSS.
 The styling will only be applied on the respective board page.
 
+When Homarr Assistant is enabled, users with modify permission can also ask it to edit the board's Custom
+CSS and other visual or behavior settings. The assistant reads the current stylesheet first and presents an
+editable review form before requesting approval to save the change.
+
 [See this guide on how to work with custom CSS](/docs/advanced/styling/).
 
 ### Behaviour
@@ -255,4 +259,4 @@ For the global home board you can only select boards that are public.
 ### Mobile home board
 
 Same as the home board, you can also set a mobile home board.
-It will be used for devices that are detected as mobile devices. (Using User-Agent header)
+It will be used for devices that are detected as mobile devices. (Using User-Agent header)

apps/docs/docs/management/mcp.mdx

@@ -129,7 +129,7 @@ Homarr exposes 50+ tools organized by namespace. Each tool is either a **query**
 | `app`              | List all apps, get app by ID, create/update/delete app   | GET + POST |
 | `apiKeys`          | List API keys                                            | GET        |
 | `beszel`           | Systems status, alerts, historical system metrics        | GET        |
-| `board`            | List boards, get board by ID, create/update/delete board | GET + POST |
+| `board`            | List boards, read settings/CSS, create/update/delete board | GET + POST |
 | `docker`           | List containers, inspect container, start/stop/restart   | GET + POST |
 | `icon`             | Search icons                                             | GET        |
 | `info`             | Server health, version info                              | GET        |