docs(plugin-config): match the config tab, icon and web-action docs to the code

- PLUGIN_CONFIG_QUICK_START / PLUGIN_CONFIGURATION_TABS /
  PLUGIN_CONFIGURATION_GUIDE: there is no "Reset to Defaults" button (the
  tab has Refresh, Update, Uninstall, Save Configuration); plugin config
  hot-reloads (ConfigService + on_config_change), so no restart; the
  schema is found by the fixed name config_schema.json, not a manifest
  config_schema field; the tab row is "Plugin Manager", not "Plugins";
  forms are server-rendered from /v3/partials/plugin-config/<id>; the
  duration hook is get_display_duration()/display_duration; a class_name
  mismatch raises PluginError; the store requires id, name, class_name and
  display_modes (not version); plugin_system.debug/log_level do not exist
  (use run.py -d / LEDMATRIX_DEBUG). Drop "future" features that shipped.
- PLUGIN_CONFIG_CORE_PROPERTIES: list all of CORE_PLUGIN_PROPERTIES,
  including skin, skin_options and the vegas_* tuning keys.
- PLUGIN_CUSTOM_ICONS: icon is only a Font Awesome class (fallback
  fa-puzzle-piece); emoji/URL icons and getPluginIcon() never existed in
  v3. Note that /api/v3/plugins/installed currently omits icon.
- PLUGIN_WEB_UI_ACTIONS (+ example JSON): success_message, error_message
  and step1_message are never read.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/PLUGIN_WEB_UI_ACTIONS.md

@@ -25,9 +25,6 @@ Add a `web_ui_actions` array to your plugin's `manifest.json`:
       "script": "path/to/script.py",
       "oauth_flow": false,
       "section_description": "Optional section description",
-      "success_message": "Action completed successfully",
-      "error_message": "Action failed",
-      "step1_message": "Authorization URL generated",
       "step2_prompt": "Please paste the full redirect URL:",
       "step2_button_text": "Complete Authentication"
     }
@@ -52,12 +49,13 @@ Add a `web_ui_actions` array to your plugin's `manifest.json`:
 - **`color`**: Color theme - `"blue"`, `"green"`, `"red"`, `"yellow"`, `"purple"`, etc. (defaults to `"blue"`)
 - **`oauth_flow`**: Set to `true` for OAuth-style two-step authentication flows
 - **`section_description`**: Description shown at the top of the actions section
-- **`success_message`**: Message shown on successful completion
-- **`error_message`**: Message shown on failure
-- **`step1_message`**: Message shown after step 1 (for OAuth flows)
 - **`step2_prompt`**: Prompt text for step 2 redirect URL input
 - **`step2_button_text`**: Button text for step 2 (defaults to "Complete Authentication")
 
+The status messages shown after an action runs come from the action's
+response (`message`), with built-in fallbacks such as "Action completed
+successfully"; there are no manifest fields for them.
+
 ## Action Types
 
 ### Script Actions (`type: "script"`)
@@ -98,7 +96,6 @@ For two-step OAuth flows (e.g., Spotify):
   "color": "green",
   "script": "authenticate_spotify.py",
   "oauth_flow": true,
-  "step1_message": "Authorization URL generated",
   "step2_prompt": "Please paste the full redirect URL from Spotify after authorization:",
   "step2_button_text": "Complete Authentication"
 }
@@ -131,9 +128,6 @@ Here's a complete example for the `ledmatrix-music` plugin:
       "script": "authenticate_spotify.py",
       "oauth_flow": true,
       "section_description": "Authenticate with Spotify or YouTube Music to enable music playback display.",
-      "success_message": "Spotify authentication completed successfully",
-      "error_message": "Spotify authentication failed",
-      "step1_message": "Authorization URL generated",
       "step2_prompt": "Please paste the full redirect URL from Spotify after authorization:",
       "step2_button_text": "Complete Authentication"
     },
@@ -145,9 +139,7 @@ Here's a complete example for the `ledmatrix-music` plugin:
       "button_text": "Authenticate YTM",
       "icon": "fab fa-youtube",
       "color": "red",
-      "script": "authenticate_ytm.py",
-      "success_message": "YouTube Music authentication completed successfully",
-      "error_message": "YouTube Music authentication failed"
+      "script": "authenticate_ytm.py"
     }
   ]
 }