feat(plugins): auto-generate admin settings UI from settingsSchema (#341)

.changeset/plugin-settings-schema-ui.md

@@ -0,0 +1,6 @@
+---
+"emdash": minor
+"@emdash-cms/admin": minor
+---
+
+Adds the auto-generated admin settings form for plugins that declare `admin.settingsSchema`. A gear icon on the plugin's card in Plugins opens a form generated from the schema (string, number, boolean, select, secret, url, and email fields), persisted to the plugin's KV store under `settings:` keys. Secret fields are write-only: the admin shows whether a value is set but never returns it. Editing plugin settings requires the `plugins:manage` permission.

docs/src/content/docs/plugins/creating-native-plugins/your-first-native-plugin.mdx

@@ -217,6 +217,8 @@ admin: {
 
 Field types: `string`, `number`, `boolean`, `select`, `secret`, `url`, `email`. Each accepts `label`, `description`, `default`, plus type-specific extras like `min`/`max`/`options`. Settings are persisted to the same per-plugin KV store sandboxed plugins use — read them with `ctx.kv.get<T>("settings:<key>")` from anywhere.
 
+The generated form appears behind the gear icon on the plugin's card in **Plugins** (admins only — editing plugin settings requires the `plugins:manage` permission). Secret fields are write-only: the admin never sees the stored value, only whether one is set.
+
 For richer settings UI than `settingsSchema` provides, ship custom React pages — see [React admin pages and widgets](/plugins/creating-native-plugins/react-admin/).
 
 ## Complete example — audit log plugin

packages/admin/src/components/PluginManager.tsx

@@ -430,14 +430,25 @@ function PluginCard({
 							</RouterLinkButton>
 						)}
 
+						{plugin.hasSettings && plugin.enabled && (
+							<RouterLinkButton
+								to="/plugins-manager/$pluginId/settings"
+								params={{ pluginId: plugin.id }}
+								aria-label={t`Settings`}
+								variant="ghost"
+								shape="square"
+								icon={<Gear />}
+							/>
+						)}
+
 						{plugin.hasAdminPages && plugin.enabled && (
 							<RouterLinkButton
 								to="/plugins/$pluginId/$"
 								params={{ pluginId: plugin.id, _splat: "" }}
-								aria-label={t`Settings`}
+								aria-label={t`Plugin pages`}
 								variant="ghost"
 								shape="square"
-								icon={<Gear />}
+								icon={<FileText />}
 							/>
 						)}