fix(locale-field-populator): remove 50-entry cap [ES-183]

[Adrian Meyer (primeinteger)]

Purpose

Remove the hard-coded 50-entry cap that prevents customers with large reference graphs from using the Locale Field Populator, and add progressive rendering to keep the preview UI performant at scale.

Approach

• Removed MAX_TOTAL_ENTRIES entirely -- the existing visited-set (cycle prevention) and configurable maxDepth already guarantee termination, making the cap redundant
• Added chunked getMany calls (batches of 100) and concurrency-limited updates (5 parallel) to stay within CMA rate limits at higher entry counts
• Added a summary banner showing total referenced entries and localizable field counts so users always see the full scope
• Render first 50 entries with incremental "Show more" pagination to avoid mounting hundreds of accordion sections at once

Screenshots

Showing the summary banner: "61 referenced entries with 64 localizable fields"

Showing the load more button: "Load 11 more entries"

[Mitch Goudy (mgoudy91)]

LGTM