Fix first-click folder context menus

[alexphillips-dev]

What changed

• prepare Docker and VM folder context menus during click capture
• keep edit/toggle actions on the existing delegated handler
• add unit and Chromium first-click regression coverage
• package dev version 2026.07.28.07 with curated release notes and regenerated SBOM/integrity data

Root cause

The shared row-action controller built and attached Unraid's context menu only after the initiating click reached the document bubble phase. That click had already passed the folder icon, so only the second click could reach the newly attached menu opener.

Validation

• focused row-action and Docker/VM architecture tests
• lint and test lanes (904 passed, 1 skipped)
• Chromium fixture browser lane (31 passed) and runtime performance budgets
• release guard, release-note consistency guard, install smoke
• guards and docs-guards, including deterministic package rebuild
• archive checksum and shipped-source comparison