feat(metadata): show unsaved changes warning for sidebar navigation attempts

[olehrybak]

Unsaved changes warning modal was previously triggered in metadata sidebar only when a user was selecting a new template when edit was in progress. This PR extends this logic to also show the warning modal when a user tries to navigate to other sidebar tabs (i.e. when sidebar router history is changing).

Changes

• Added history.block navigation guard that intercepts sidebar tab switches while the metadata editor is open (gated behind isConfidenceScoreReviewEnabled feature flag)
• On "Discard Changes": removes the blocker, clears the editor, and completes the pending navigation via history.push
• On "Continue Editing": re-syncs the URL back to /metadata via history.replace to fix any URL desync caused by external navigators (e.g., Box AI button in EndUserApp), then re-installs the blocker
• Blocker is automatically cleaned up when editing ends or the component unmounts

[CLAassistant]

All committers have signed the CLA.

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