ECHO Launcher v1.0.7

Stability hotfix for selected-pack installs and launcher handoff.\n\n- Rejects cross-pack manifests before install, repair, verify, handoff, export, or readiness work starts.\n- Makes readiness and Home/Tools/Downloads/Runtime views selected-pack aware.\n- Safely upgrades marker-stripped deterministic ECHO Minecraft Launcher profiles while preserving user-created profiles.\n- Stops clean repairs from looping back to Repair when files verify but launch routing needs diagnostics.\n- Keeps the visual overhaul while lazy-loading pack art, memoizing cards/actions, and pausing polling while hidden.\n\nValidation: npm run test, npm run lint, npm run build, npm run perf:budget, npm run test:e2e:release-index, npm run package:win.