Migrate AmountSelectorModal to be nav RHP

[mhawryluk]

Explanation of Change

Migrates AmountSelectorModal, used only by AmountPicker, used only by WorkspaceCreateTaxPage to be a navigation-based RHP, not a modal.

Fixed Issues

$ #53493
PROPOSAL: N/A

Tests

1. Open a workspace.
2. Enable Taxes in More features if not enabled already.
3. Open the Taxes tab.
4. Click Add rate
5. Click Value
6. Verify the amount form RHP is opened and the field is autofocused.
7. Refresh the page (on web) and check if it's still visible.
8. Enter a value > Save.
9. Create a Tax, verify the value is correctly saved.
10. Click the Add rate button again.
11. Verify the previously typed value is not filled in.

Offline tests

N/A

QA Steps

• Verify that no errors appear in the JS console

Same as tests.

PR Author Checklist

• I linked the correct issue in the ### Fixed Issues section above
• I wrote clear testing steps that cover the changes made in this PR
  • I added steps for local testing in the Tests section
  • I added steps for the expected offline behavior in the Offline steps section
  • I added steps for Staging and/or Production testing in the QA steps section
  • I added steps to cover failure scenarios (i.e. verify an input displays the correct error message if the entered data is not correct)
  • I turned off my network connection and tested it while offline to ensure it matches the expected behavior (i.e. verify the default avatar icon is displayed if app is offline)
  • I tested this PR with a High Traffic account against the staging or production API to ensure there are no regressions (e.g. long loading states that impact usability).
• I included screenshots or videos for tests on all platforms
• I ran the tests on all platforms & verified they passed on:
  • Android: Native
  • Android: mWeb Chrome
  • iOS: Native
  • iOS: mWeb Safari
  • MacOS: Chrome / Safari
• I verified there are no console errors (if there's a console error not related to the PR, report it or open an issue for it to be fixed)
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    • If any non-english text was added/modified, I used JaimeGPT to get English > Spanish translation. I then posted it in #expensify-open-source and it was approved by an internal Expensify engineer. Link to Slack message:
  • I verified all numbers, amounts, dates and phone numbers shown in the product are using the localization methods
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Screenshots/Videos

Android: Native

Nagranie.z.ekranu.2026-05-12.o.17.16.07.mov

Android: mWeb Chrome

Nagranie.z.ekranu.2026-05-12.o.17.22.17.mov

iOS: Native

Simulator.Screen.Recording.-.iPhone.17.Pro.-.2026-05-12.at.17.28.40.mov

iOS: mWeb Safari

Simulator.Screen.Recording.-.iPhone.17.Pro.-.2026-05-12.at.17.25.10.mov

MacOS: Chrome / Safari

Nagranie.z.ekranu.2026-05-12.o.16.03.27.mov

[codecov]

Codecov Report

❌ Looks like you've decreased code coverage for some files. Please write tests to increase, or at least maintain, the existing level of code coverage. See our documentation here for how to interpret this table.

Files with missing lines	Coverage Δ
src/SCREENS.ts	100.00% <ø> (ø)
...gation/linkingConfig/RELATIONS/WORKSPACE_TO_RHP.ts	100.00% <ø> (ø)
src/libs/Navigation/linkingConfig/config.ts	76.92% <ø> (ø)
src/ROUTES.ts	17.43% <0.00%> (-0.02%)	⬇️
...gation/AppNavigator/ModalStackNavigators/index.tsx	6.73% <0.00%> (-0.01%)	⬇️
...c/pages/workspace/taxes/WorkspaceCreateTaxPage.tsx	0.00% <0.00%> (ø)
src/pages/workspace/taxes/TaxValuePicker.tsx	0.00% <0.00%> (ø)
...es/workspace/taxes/WorkspaceCreateTaxValuePage.tsx	0.00% <0.00%> (ø)
... and 6 files with indirect coverage changes

[jmusial]

Naming suggestion WorkspaceCreateTaxAmountSelectorPage to be consistent with all the var names

Or rename variable to sth like TAX_VALUE_PICKER

[mhawryluk]

I kept the original name, but since there's no AmountPicker anymore, I think it's consistent

[jmusial]

Is it possible to use sth else for focus thatn setTimeout ?

[mhawryluk]

yes, I used TransitionTracker (cc: @collectioneur)

[jmusial]

claaude suggests:

Duplication with existing ValuePage (screen TAX_VALUE) already handles editing an existing tax rate's value. The new WorkspaceCreateTaxValuePage does essentially the same thing for the create flow. Worth a follow-up to consolidate or at least factor a shared NumberWithSymbolForm-wrapped subcomponent so future styling/validation fixes don't have to be applied twice.

worth checking out if we can unify them

[mhawryluk]

claaude suggests:

Duplication with existing ValuePage (screen TAX_VALUE) already handles editing an existing tax rate's value. The new WorkspaceCreateTaxValuePage does essentially the same thing for the create flow. Worth a follow-up to consolidate or at least factor a shared NumberWithSymbolForm-wrapped subcomponent so future styling/validation fixes don't have to be applied twice.

worth checking out if we can unify them

the two pages differ significantly, most importantly they save the value in different places and they have different validation. I don't think introducing an additional common component is worth it.