fix: keep permissions on adapted json responses

[benpeter]

adaptJsonResponse rebuilds the response with new Response(body, resp), which copies status, statusText and headers only, so the permissions daFetch set on the original were dropped. on hlx6 that left source.save returning a response without them. da-live's initProse then threw on permissions.some(...), so creating a document did not open the editor.

the same helper runs in config.get, so this also restores write access to the site-config sheet on hlx6.

testing: da-live's Playwright Helix suite, pinned to this branch, is 109 passed and 0 failed. it had been 27 failed since 2026-08-07. hand-tested on da.live against a local nx2, where creating a document on a hlx6 site opens the editor with contenteditable="true".

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Commits

• 102137a ✅ (latest)
• 115cb1d ✅