fix(ui): align contextual documentation with headings

Verified with the coordinated workspace changes by devkit full run
2026-09-08T225814-186389-0000-3e3ed7cd (all seven phases passed).
This shared UI pass does not mark the individual module reviews complete.

webui/src/features/mail/MailboxPage.tsx

@@ -626,6 +626,8 @@ export default function MailboxPage({ settings, auth }: { settings: ApiSettings;
       {error && <DismissibleAlert tone="danger" resetKey={error} floating>{error}</DismissibleAlert>}
 
       <WorkspaceActionBar
+        title="i18n:govoplan-mail.mailbox_workspace"
+        titleHelp={<DocumentationHelpLink reference={MAILBOX_DOCUMENTATION} />}
         variant="workspace"
         scope="workspace"
         label="i18n:govoplan-mail.mail_actions.c08b5f08"
@@ -647,7 +649,6 @@ export default function MailboxPage({ settings, auth }: { settings: ApiSettings;
           </FormField>
           <Button type="button" onClick={() => setMailToolsOpen(true)} helpContextId="mail.mailbox.tools" helpModuleId="mail" helpTopicId="mail.workflow.read-mailbox">i18n:govoplan-mail.mailbox_tools</Button>
         </>}
-        helpAction={<DocumentationHelpLink reference={MAILBOX_DOCUMENTATION} />}
       />
 
       <div className={`file-manager-shell mailbox-shell ${shellBusy ? "is-loading" : ""}`}>