Add cumulative notes for 2026.04.06.04

Author: FolderView Plus Test

docs/releases/2026.04.06.04.md

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+This release includes the full cumulative delta since `v2026.04.05.13`.
+
+### Runtime and Preview Fixes
+- Stabilized Docker and VM runtime rows, folder state handling, and action refresh paths so status surfaces stay aligned during in-place actions.
+- Fixed Docker preview cards, status icons, labels, and action buttons to live-refresh after folder actions instead of showing stale started, paused, or stopped state.
+- Ensured Docker preview click menus and native container menus resync runtime state before opening so context actions match the current container state.
+
+### Diagnostics and Clarity
+- Diagnostics health cards now call out the real Docker or VM integrity issue instead of falling back to generic folder, rule, or backup counts.
+- Added targeted regression coverage for diagnostics summary rendering, orphaned-member reporting, and path-issue presentation.
+
+### Quality and Release Hardening
+- Expanded regression coverage around runtime refresh behavior and Docker preview state synchronization.
+- Hardened CI, packaging, and main-to-dev release artifact reconciliation so stable release publishing and follow-up syncs stay reliable.