fix(router): restore new test regressions

[Sheraff]

Summary

• restore structural sharing in React useLocation while keeping the hook on the direct location store path
• thread Vue Link transition state into rendered props so slot children receive isTransitioning during pending navigation
• keep the new tests added on main green on top of refactor-signals

Testing

• CI=1 NX_DAEMON=false pnpm nx run @tanstack/react-router:test:unit --outputStyle=stream --skipRemoteCache -- tests/useLocation.test.tsx
• CI=1 NX_DAEMON=false pnpm nx run @tanstack/vue-router:test:unit --outputStyle=stream --skipRemoteCache -- tests/link.test.tsx -t "Link slot receives isTransitioning during pending navigation"
• CI=1 NX_DAEMON=false pnpm nx run @tanstack/solid-router:test:unit --outputStyle=stream --skipRemoteCache -- tests/server/errorComponent.test.tsx

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[nx-cloud]

🤖 Nx Cloud AI Fix Eligible

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View your CI Pipeline Execution ↗ for commit 6181aca

Command	Status	Duration	Result
nx affected --targets=test:eslint,test:unit,tes...	❌ Failed	2m 12s	View ↗

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☁️ Nx Cloud last updated this comment at 2026-03-08 13:12:00 UTC

[github-actions]

Bundle Size Benchmarks

• Commit: 446d7973cfc5
• Measured at: 2026-03-08T12:52:35.845Z
• Baseline source: history:446d7973cfc5
• Dashboard: bundle-size history

Scenario	Current (gzip)	Delta vs baseline	Raw	Brotli	Trend
react-router.minimal	87.91 KiB	+1.07 KiB (+1.24%)	277.16 KiB	76.38 KiB	▁▁▁▂▂▂▂▂▂▂▂█
react-router.full	91.18 KiB	+1.30 KiB (+1.44%)	287.99 KiB	79.14 KiB	▁▁▁▂▂▂▂▂▂▂▂█
solid-router.minimal	35.26 KiB	-930 B (-2.51%)	106.65 KiB	31.64 KiB	▆▆▆████████▁
solid-router.full	39.73 KiB	-786 B (-1.90%)	120.25 KiB	35.58 KiB	▅▅▅████████▁
vue-router.minimal	53.07 KiB	+1.03 KiB (+1.98%)	152.09 KiB	47.64 KiB	▁▁▁▂▂▂▂▂▂▂▂█
vue-router.full	58.10 KiB	+1.25 KiB (+2.20%)	168.15 KiB	52.02 KiB	▁▁▁▂▂▂▂▂▂▂▂█
react-start.minimal	100.56 KiB	+1.15 KiB (+1.16%)	316.35 KiB	86.99 KiB	▁▁▁▂▂▂▂▂▂▂▂█
react-start.full	103.94 KiB	+1.16 KiB (+1.13%)	326.66 KiB	89.87 KiB	▁▁▁▂▂▂▂▂▂▂▂█
solid-start.minimal	47.58 KiB	-929 B (-1.87%)	144.28 KiB	42.07 KiB	▆▆▆████████▁
solid-start.full	53.20 KiB	-782 B (-1.42%)	160.78 KiB	46.84 KiB	▅▅▅████████▁

Trend sparkline is historical gzip bytes ending with this PR measurement; lower is better.

[pkg-pr-new]

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commit: e614bb0

[codspeed-hq]

Merging this PR will not alter performance

✅ 6 untouched benchmarks

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_{Comparing opencode/tidy-garden (6181aca) with refactor-signals (e807c00)}