Changes

tsk60: Implements story creation/editing UI
Added a full story editor feature including the editor.xhtml page, 
supporting CSS, and a session-scoped backing bean. Implemented genre and
theme selection, dynamic content limits, and a paper-style writing UI.
Updated web.xml to secure the editor for CREATOR users and enable form
login. Introduced logic for loading, editing, and creating stories with
proper access control and validation.