Normalize connection URL whitespace

[bakar-dev]

Description

• Normalize the Public or Proxy Endpoint and Graph Connection URL fields when the connection form is submitted.
• Remove carriage returns and newline characters, then trim surrounding whitespace before validation and storage.
• Reject URL values that become empty after normalization.
• Add regression tests covering both URL fields and whitespace-only input.

Validation

• Ran pnpm checks successfully.
• Ran the complete pnpm test suite successfully: 191 test files and all 2,220 tests passed.
• Manually reproduced the issue and verified the fix by saving and reopening a connection.

Before

The saved URL retains surrounding whitespace and a newline:

After

The saved URL is normalized into a clean single line:

Related Issues

• Fixes Connection form accepts spaces and newlines in URL fields #1978

Check List

• I confirm that my contribution is made under the terms of the Apache 2.0 license.
• I have verified pnpm checks passes with no errors.
• I have verified pnpm test passes with no failures.
• I have covered new added functionality with unit tests if necessary.
• I have updated documentation if necessary.

[kmcginnes]

Thanks for this! I'm assuming based on your comments and description that you did not intend to leave this in draft. Merging, as this cleanly delivers the form-side of #1978 (strip newlines + trim on submit).

For context: this normalizes on submit, so it cleans a connection when the user re-saves it. The complementary read-path fix has already landed in main via #1998. That moves normalization into normalizeConnection, so connections already persisted with whitespace/newlines (including the graph-db-connection-url proxy header) are cleaned on read without needing a re-save.

The two compose: your form-layer fix gives immediate validation feedback, and the read-layer fix covers the installed base.