Andrey Antukh 796a76ff32 🐛 Add content:write permission checks to flow and flex layout plugin API
Add permission checks to prototype flow and flex layout operations
that were missing them, allowing plugins to modify flows and layout
structure without explicit user permission.

Changes:
- page.cljs: Add content:write checks to flow-proxy (name,
  startingBoard setters, remove) and page-proxy (createFlow,
  removeFlow)
- flex.cljs: Add content:write checks to flex-layout-proxy
  (remove, appendChild)

Follows the established pattern from tokens.cljs, shape.cljs,
and library.cljs.

Relates to #11137

AI-assisted-by: qwen3.7-plus
2026-08-18 11:06:09 +00:00
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