7a2d878b

By: Michael Lynch <git@mtlynch.io>

Show owner caption editing controls

Add tested caption display and editor fragments with owner-only GET endpoints.
The update endpoint intentionally returns 501 until the next stacked commit
persists caption updates.
configuredevShellx86_64-linuxbackendbackend-devcheck-bashcheck-frontendcheck-go-formattingcheck-go-test-packagescheck-trailing-newlinecheck-trailing-whitespacedeploy-to-flydiagramdocker-imagee2e-testsgo-testsimport-from-tinybeansjs-testslint-sqllittle-momentslittle-moments-devx86_64-linux