chore(webui): Upgrade Antd to 6.x and remove @ant-design/v5-patch-for-react-19 (resolves #1894).

[junhaoliao]

Description

Upgrade antd from v5 (^5.27.5) to v6 (^6.3.1) and remove the
@ant-design/v5-patch-for-react-19 compatibility shim, which is no longer needed since Antd 6.x has native React 19 support.

Antd v6 migration notes

Reviewed the v5 → v6 migration guide and the
v6 changelog in full. The following is a summary of significant v6 changes and how they affect the codebase:

Breaking changes addressed in this PR:

• ThemeConfig.cssVar no longer accepts boolean — removed cssVar: true.
• Alert.message → Alert.title — renamed in QueryDrawer.tsx.
• notification's message → title — renamed in useUpdateStateWithMetadata.ts.
• @ant-design/v5-patch-for-react-19 unnecessary with native React 19 support — removed.

Checklist

• The PR satisfies the contribution guidelines.
• This is a breaking change and that has been indicated in the PR title, OR this isn't a
  breaking change.
• Necessary docs have been updated, OR no docs need to be updated.

Validation performed

Start CLP, compress data, and verify the webui renders correctly.

Command:

$ cd build/clp-package
$ ./sbin/start-clp.sh

Output:

2026-03-05T20:34:58.575 INFO [controller] Setting up environment for bundling database...
...
2026-03-05T20:35:10.804 INFO [controller] Started CLP.

Command:

$ ./sbin/compress.sh --timestamp-key timestamp ~/samples/postgresql.jsonl

Output:

2026-03-05T20:35:15.643 INFO [compress] Compression job 1 submitted.
2026-03-05T20:35:17.647 INFO [compress] Compressed 385.21MB into 10.06MB (38.31x). Speed: 200.98MB/s.
2026-03-05T20:35:18.148 INFO [compress] Compression finished.
2026-03-05T20:35:18.148 INFO [compress] Compressed 385.21MB into 10.06MB (38.31x). Speed: 178.72MB/s.

---

Verify that the webui renders correctly with Antd 6.x — Ingest page, Search
page, and search execution.

Used headless Chromium via Playwright to capture screenshots of:

• Ingest page (http://localhost:4000): Dashboard cards (Space Savings, Time Range,
  Uncompressed/Compressed Size), compression form (Paths TreeSelect, Dataset Input,
  Timestamp Key Input, Unstructured Logs Checkbox, Submit Button), and Compression Jobs
  table all render correctly. The completed compression job shows the correct status badge.
• Search page (http://localhost:4000/search): Dataset Select, query Input, case
  sensitivity toggle Button, time range DatePicker, Search Button, results Timeline
  (chart.js), and results Table all render correctly.
• Search execution: Submitted a search query ("ERROR") — the search completed
  successfully, showing the "Success" result status with Typography and the timeline
  updated to the search time range.

All UI components render identically to v5 with no layout regressions.

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