[WIP] [Performance] Fix global create scan misidentifying Search context via fallback chain

[JakubKorytko]

Explanation of Change

Fixes a submit-to-destination-visible span failure identified from 3 Sentry traces on iOS HybridApp.

Global create scan from Spend misidentifies Search context (traces d0c23d02, 2a89ae3d, 9789e05e, iOS HybridApp, 44.5–50.6s): isSearchTopmostFullScreenRoute() returns false because live tab state is sliced. Fix: getTopmostFullScreenRoute now falls back through live state → preserved state → params.screen hint. navigateAfterExpenseCreate no longer infers Search root from missing navigator state.

Fixed Issues

$ #93725
PROPOSAL: N/A

Tests

1. Use a narrow layout on iOS (HybridApp preferred)
2. Open Spend > Expenses
3. Open global create
4. Create an expense using receipt scan
5. Submit the scanned expense
6. Verify the app dismisses back to Spend > Expenses without a prolonged stall (should be <5s, not the 40-50s seen in production traces)
7. Verify in the ManualSubmitToDestinationVisible span end log that fast_path_handler is search_dismiss, not default

Offline tests

N/A

QA Steps

Same as tests.

PR Author Checklist

• I linked the correct issue in the ### Fixed Issues section above
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Screenshots/Videos

Android: Native

Android: mWeb Chrome

iOS: Native

iOS: mWeb Safari

MacOS: Chrome / Safari

[JakubKorytko]

@codex review

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[JakubKorytko]

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[codecov]

Codecov Report

✅ Changes either increased or maintained existing code coverage, great job!

Files with missing lines	Coverage Δ
...bs/Navigation/helpers/getTopmostFullScreenRoute.ts	100.00% <100.00%> (ø)
...s/Navigation/helpers/navigateAfterExpenseCreate.ts	88.09% <100.00%> (+1.25%)	⬆️
src/libs/SearchQueryUtils.ts	86.09% <100.00%> (+0.01%)	⬆️
... and 71 files with indirect coverage changes

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[chatgpt-codex-connector]

Read nested Search params before trusting params.screen

When the live and preserved tab state are both missing but the tab route still carries nested Search params (for example an unmounted/lazy Search invoice route), this stub makes isSearchTopmostFullScreenRoute() return true while getCurrentSearchQueryJSON() still falls back to the default expense query because it cannot read those params. In the global-create confirmation flow, submitting an expense over an invoice Search route is then treated as same-type and only dismisses the modal instead of navigating/pre-inserting the expense Search route, leaving the new expense off-screen. Either carry/read the nested Search params or avoid the Search fast path when only this stub is available.

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