fix: add invitation template formatting controls

CHANGELOG.md

@@ -24,6 +24,7 @@ All notable changes to this project will be documented in this file.
 
 - Updated the invitation registration page to show fields only for valid tokens, use the themed failure state for invalid links, and pre-fill the invited email and display name.
 - Made the invited email visibly disabled, kept the display name editable and required, and aligned invitation actions with the existing user forms.
+- Added bold, italic, and underline formatting controls to the user invitation email message template editor.
 - Updated API progress bars to inherit the surrounding WYSIWYG text size and text color, preserve rounded corners, and render consistently in the editor preview, player, and thumbnails.
 
 ## 2.11.0 - 2026-09-02

src/web/views/settings/system/index.hbs

@@ -350,6 +350,7 @@
                 <label class="form-label" for="settings-invitation-subject">Subject</label>
                 <input id="settings-invitation-subject" name="invitation_subject" type="text" class="form-control mb-2" value="{{mediaSettings.invitationEmailSubject}}" maxlength="255" data-email-template-subject>
                 <label class="form-label" for="settings-invitation-body">Message</label>
+                <div class="btn-toolbar mb-2" role="toolbar" aria-label="Invitation message formatting"><div class="btn-group btn-group-sm" role="group"><button type="button" class="btn btn-outline-secondary" data-email-format="b"><strong>B</strong></button><button type="button" class="btn btn-outline-secondary" data-email-format="i"><em>I</em></button><button type="button" class="btn btn-outline-secondary" data-email-format="u"><u>U</u></button></div></div>
                 <textarea id="settings-invitation-body" name="invitation_body" class="form-control" rows="5" data-email-template-body>{{mediaSettings.invitationEmailBody}}</textarea>
                 <div class="row g-2 mt-1">
                   <div class="col-12 col-md-8"><label class="form-label" for="settings-invitation-button-text">Button text</label><input id="settings-invitation-button-text" name="invitation_button_text" type="text" class="form-control" value="{{mediaSettings.invitationButtonText}}" maxlength="120" data-email-template-button-text></div>