Add a reusable content library with clause locking

[jusso-dev]

Context

ScopeStack has templates and default sections, but it does not yet have a reusable content library. PandaDoc-style proposal tools rely heavily on approved content blocks, reusable clauses, service descriptions, and locked content.

Goal

Add a content library for reusable, approved document blocks that can be inserted into templates/documents and optionally locked.

Scope

• Create content library items with title, category, body/content, tags, and status.
• Support categories such as:
  • Legal clauses
  • Scope blocks
  • Assumptions
  • Case studies
  • Service descriptions
  • Terms/disclaimers
• Allow inserting content blocks into templates/documents.
• Allow content locking so users can include but not edit approved legal/commercial blocks.
• Track source library item and version used in a template/document.
• Add search/filter UI for library items.

UX Notes

• Library should feel like an operational knowledge base, not a marketing page.
• In template editor, provide an "Insert from library" action near section editing.
• Locked blocks should be visibly locked with concise affordance and reason.

Data/Architecture Notes

Potential models:

• ContentLibraryItem
  • organisationId
  • title
  • category
  • content
  • tags
  • status draft/published/archived
  • lockedByDefault
• ContentLibraryVersion if versioning is needed.
• Template/document sections may store sourceContentItemId and locked.

Acceptance Criteria

• Users can create, edit, publish, archive content library items.
• Users can search/filter library items.
• Users can insert library content into a template/document.
• Locked content cannot be edited in document/template editors by normal users.
• Inserted content records its source item/version.
• Audit logs record library changes and insertions.

Dependencies

• None hard, but template editor UX will need careful integration.

Priority

P1. High leverage for template consistency and team adoption.