feat(quick-edit): support scoped preview reloads

[andreas-haller]

Fix #738

Summary see adobe/da-live#1403.

Details

• Add an opt-in bootstrap initializer that defaults reloads to main and prevents duplicate initialization by the legacy loader.
• Support main-scoped reloads in nx and nx2, with opt-in block/section replacement in nx.
• Add scope detection to the standalone portal, serialize body updates, and update retained DOM indices after partial replacements.
• Decorate replaced content in detached DOM. Fall back to refreshing all of main when partial replacement is unsafe, or to full-body loadPage where required and available.
• Add bootstrap, scope-selection, and replacement tests; update the protocol documentation.

Rollout

Merging both branches ships the capability but does not automatically inject the initializer. Keep the existing site-script snippet until testing is complete. Without the initializer, that snippet retains legacy full-body reloads; when loaded first, the initializer owns loading and suppresses the legacy loader.

For testing instructions see adobe/da-live#1403.

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Commits

• 83d6138 ✅ (latest)
• 6230a10 ✅
• d09e934 ✅