## Summary
Normalize legacy prefixed proxyWidget entries during subgraph configure
so nested subgraph widgets resolve correctly.
## Changes
- **What**: Extract `normalizeLegacyProxyWidgetEntry` to strip legacy
`nodeId: innerNodeId: widgetName` prefixes from serialized proxyWidgets
and resolve the correct `disambiguatingSourceNodeId`. Write-back
comparison now checks serialized content (not just array length) so
stale formats are cleaned up even when the entry count is unchanged.
## Review Focus
- The iterative prefix-stripping loop in `resolveLegacyPrefixedEntry` —
it peels one `N: ` prefix per iteration and tries all disambiguator
candidates at each level.
- The write-back condition change from length comparison to
`JSON.stringify` equality.
┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-10573-fix-normalize-legacy-prefixed-proxyWidget-entries-on-configure-32f6d73d365081e886e1c9b3939e3b9f)
by [Unito](https://www.unito.io)
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Co-authored-by: Amp <amp@ampcode.com>
