Root cause: there was a stale loading overlay outside the tab content
(added by a previous subagent) that rendered when editLoading was true,
covering the entire modal body. Also loadDetailMembership incorrectly
managed editLoading causing state inconsistencies.
Fix:
- Remove the orphaned loading overlay outside tab content blocks
- loadDetailMembership no longer touches editLoading (switchTab owns it)
- switchTab uses Promise.all for parallel loading with formReady guard
- openDetail resets editLoading/formReady to clean state
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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