docs(project-editor): document new shared/ui primitives and fixed bugs

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

docs/KNOWN-ISSUES.md

@@ -40,7 +40,30 @@ don't fix inline unless asked.
 
 ## Fixed
 
-1. **Quick Actions: 3 untranslated raw i18n keys.**
+1. **Project Editor footer: payment icons and social links had no validation.**
+   `footer-section.component.ts` parsed both fields from pipe-delimited
+   `<textarea>` strings (`icon.src|icon.alt`, `link.id|link.label|link.url`)
+   with zero validation - malformed rows silently produced empty `src`/`alt`/
+   `url` values instead of surfacing an error.
+   - Fixed: 2026-07-16, replaced both textareas with `app-key-value-editor`
+     rows (icon picked via `MediaPickerComponent`, label/URL via `app-input`),
+     added inline URL-format validation on social links (same `HTTP_URL`
+     pattern used in `project-validator.service.ts`) and a missing footer-logo
+     media picker.
+
+2. **Project Editor navigation: nav link labels only editable for the default locale.**
+   `navigation-section.component.ts`'s `labelOf` helper (and the facade's
+   `updateNavLinkLabel`) always read/wrote the default locale's key on a
+   `NavigationLocalizedText` label map, so switching locales elsewhere in the
+   editor had no effect on nav link text - other locales' translations could
+   only be edited by hand-editing the exported JSON.
+   - Fixed: 2026-07-16, added `app-locale-tabs` to the section; the label
+     input now reads/writes the active tab's locale via a new
+     `editableLabel()` helper, and `ProjectEditorFacade.updateNavLinkLabel()`
+     gained an optional `locale` parameter (defaults to the current default
+     locale, so existing callers are unaffected).
+
+3. **Quick Actions: 3 untranslated raw i18n keys.**
    `dashboard.actionUsers`, `dashboard.actionMonitoring`,
    `dashboard.actionAnalytics` rendered as literal key strings instead of
    translated labels on the admin dashboard's Quick Actions section, because