fix: canonicalize indexed database query parameters

[astandrik]

Summary

• canonicalize known single-value database query parameters parsed as repeated arrays or indexed objects
• apply the same normalization to generated links and URL-backed state transitions
• keep intentional unknown arrays as repeated parameters, remove utm_referrer, and avoid dangling delimiters

Root cause

qs.parse converts repeated or indexed query keys into arrays or objects. The link-generation and unknown-parameter restoration paths serialized those structures without first collapsing known scalar UI state, allowing corrupted database URLs to retain or introduce multiple values and numeric bracket keys.

Impact

Existing corrupted URLs are canonicalized on the next generated link or URL-backed state change. The last scalar value wins, while unlisted multi-value parameters remain multi-valued. This does not add a startup redirect or change the public top-level API.

Validation

• npm test -- src/store/__test__/state-url-mapping.test.ts src/routes.test.ts --runInBand --no-cache
• npm run typecheck
• npm run lint
• npm test — 123 suites, 1247 tests
• npm run package

Fixes #4119

CI Results

Test Status: ❌ FAILED

📊 Full Report

Total	Passed	Failed	Flaky	Skipped
750	746	1	3	0

😟 No changes in tests. 😕

Bundle Size: 🔺

Current: 64.41 MB | Main: 64.41 MB
Diff: +5.50 KB (0.01%)

⚠️ Bundle size increased. Please review.

ℹ️ CI Information

• Test recordings for failed tests are available in the full report.
• Bundle size is measured for the entire 'dist' directory.
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• 🔺 indicates increase, 🔽 decrease, and ✅ no change in bundle size.