docs: update documentation to OKF v0.1 format

docs/guides/admin-general-settings.md

@@ -3,7 +3,7 @@ type: guide
 title: Admin — General Settings
 description: How an admin edits global platform settings (page title, logo, theme, event window, default challenge IP, registrations, welcome Markdown) from the /admin/general page.
 tags: [guide, admin, settings, general, tester]
-timestamp: 2026-07-22T12:00:00Z
+timestamp: 2026-07-22T12:44:45Z
 ---
 
 # When this view is available
@@ -17,7 +17,7 @@ by navigating directly to the URL.
 |------------------|----------------------------------------------------------------------------|------------------------------------------------|
 | Client route     | `frontend/src/app/app.routes.ts`                                           | `/admin/general` child of `adminGuard`.        |
 | Client component | `frontend/src/app/features/admin/general.component.ts`                     | `AdminGeneralComponent.ngOnInit` fetches settings + themes. |
-| Client predicate | `frontend/src/app/features/admin/general.pure.ts` (`deriveEventState`)     | Computes the read-only event-state label.      |
+| Client predicate | `frontend/src/app/features/admin/general.pure.ts` (`deriveEventState`, `pageTitleError`, `pageTitleMessage`) | Pure helpers for event-state derivation and Page-title error/message mapping. |
 | Server route     | `backend/src/modules/admin/admin-general.controller.ts`                    | `GET/PUT /api/v1/admin/general/settings` + `GET /api/v1/admin/general/themes`. |
 
 # How to access (tester steps)
@@ -81,13 +81,42 @@ The page is a single reactive form with these controls (every
   never issued. The server trims surrounding whitespace and re-validates
   against the same 1–120 character rule, so invalid payloads return
   `400 VALIDATION_FAILED` and the stored Page title is unchanged.
-  On success the form is patched with the response,
-  `general-save-ok` renders briefly, and the backend emits an SSE
-  `general` event via `SseHubService` so other tabs refresh their theme.
+  On success the form is patched with the response, the Page-title
+  control is marked untouched/pristine (so a freshly-loaded valid
+  form does not flash an error), `general-save-ok` renders briefly, and
+  the backend emits an SSE `general` event via `SseHubService` so
+  other tabs refresh their theme.
 * **Error states:** load failures render `general-error`; save failures
   render `general-save-error` with the `error.message` (or
   `error.error.message`) from the standard envelope.
 
+# Page-title inline error message
+
+The inline error message under the Page-title field
+(`general-pageTitle-error`) is driven by the pure helper
+`pageTitleMessage(value, controlErrors, maxLength = 120)` exported from
+`frontend/src/app/features/admin/general.pure.ts:10-22`. The component
+keeps three local `signal`s — `pageTitleValue`, `pageTitleInvalid`,
+`pageTitleTouchedOrDirty` — and subscribes to the reactive form
+control's `valueChanges` and `statusChanges` (via
+`takeUntilDestroyed(this.destroyRef)`) so the `computed`s for
+`showPageTitleError` and `pageTitleMessage` re-evaluate when the user
+types or blurs the input. The helper returns:
+
+| Condition                                                    | Message                                                   |
+|--------------------------------------------------------------|-----------------------------------------------------------|
+| Empty or whitespace-only value                               | `Page title is required and cannot contain only whitespace.` |
+| Value length > 120                                           | `Page title must be 120 characters or fewer.`            |
+| Control has `required`, `maxlength`, or `whitespace` error   | Matching human-readable message (whitespace falls back to "required" wording). |
+| Valid value                                                  | `null` (no message rendered, Save becomes enabled).       |
+
+As a result, the `general-pageTitle-error` element renders as soon as
+the Page-title control becomes both `touched || dirty` AND `invalid`,
+without requiring a full component re-render. After a successful
+Save, the control is reset to untouched/pristine and the
+`pageTitleTouchedOrDirty` signal is cleared, so reloading valid
+settings does not flash a stale error.
+
 # Visual elements
 
 | Element                       | Selector                                            |
@@ -98,6 +127,7 @@ The page is a single reactive form with these controls (every
 | Form                          | `[data-testid="general-form"]`                      |
 | Welcome preview               | `[data-testid="general-welcome-preview"]`           |
 | End-before-start message      | `[data-testid="general-endBeforeStart"]`            |
+| Page-title inline error       | `[data-testid="general-pageTitle-error"]`           |
 
 # Architecture map