File upload fix:
- Buffer file data immediately on selection to prevent stale IBrowserFile references
- Add BufferedFile record to hold file data in memory
- Add loading indicator while files are being buffered
- Fixes "Cannot read properties of null (reading '_blazorFilesById')" error
Company matching improvement:
- Prefer companies that existed at the claimed employment start date
- Fixes matching wrong company when newer company has similar name
- Example: "UK MATTEL LTD" (2025) vs "MATTEL U.K. LIMITED" (1980)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
peter
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