fix: Re-apply screen reader disabled button announcement with crash fix

[MelvinBot]

Explanation of Change

Re-applies the screen reader fix from the reverted PR (#86888) that makes screen readers properly announce disabled button state, plus fixes the regression that caused the revert.

Screen reader fix (re-applied from #86888):

• BaseGenericPressable.tsx: Changed disabled={fullDisabled} → disabled={fullDisabled || undefined} so React Native's Pressable doesn't overwrite accessibilityState.disabled when the button is not fully disabled
• index.tsx (web): Added a useLayoutEffect to imperatively set aria-disabled on the DOM element, since react-native-web's Pressable always derives aria-disabled from its own disabled prop

Crash fix (prevents deploy blocker #87629):

• TimezoneInitialPage.tsx: Changed disabled={timezone.automatic} → disabled={!!timezone.automatic} — the backend may return timezone.automatic as a string (e.g. "true"), which crashes native when passed to accessibilityState.disabled (expects boolean)
• TimezoneSelectPage.tsx: Same coercion for isDisabled prop
• SamlLoginSectionContent.tsx: Same coercion for domainSettings?.twoFactorAuthRequired

Fixed Issues

$ #76908
PROPOSAL: #76908 (comment)

Tests

1. Using a screen reader (JAWS/VoiceOver), navigate to a disabled button (e.g. the "Next" button in Workspace > Workflows > Add Approval Workflow before selecting an expense source)
2. Verify the screen reader announces the button as disabled (e.g. "Next, disabled, button" on Windows or "Next, dimmed, button" on macOS/iOS)
3. Navigate to Profile > Timezone while offline
4. Verify the app does NOT crash (this was the regression from the previous attempt)
5. Verify the timezone selection menu item is correctly disabled when automatic timezone is on

• Verify that no errors appear in the JS console

Offline tests

1. Enable airplane mode / disconnect from network
2. Navigate to Profile > Timezone
3. Verify the page loads without crashing
4. Verify the timezone menu item is disabled when automatic timezone is toggled on

QA Steps

1. Using a screen reader (JAWS on Windows, VoiceOver on macOS/iOS, TalkBack on Android), navigate to Workspace > Workflows > Add Approval Workflow
2. TAB to the disabled "Next" button and verify it announces as disabled
3. Navigate to Profile > Timezone while offline — verify no crash
4. Toggle automatic timezone on, verify the timezone selection item is announced as disabled

• Verify that no errors appear in the JS console

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)
• I followed proper code patterns (see Reviewing the code)
  • I verified that any callback methods that were added or modified are named for what the method does and never what callback they handle (i.e. toggleReport and not onIconClick)
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  • I verified that any new or modified comments were clear, correct English, and explained "why" the code was doing something instead of only explaining "what" the code was doing.
  • I verified any copy / text shown in the product is localized by adding it to src/languages/* files and using the translation method
    • 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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• I verified any variables that can be defined as constants (ie. in CONST.ts or at the top of the file that uses the constant) are defined as such
• I verified that if a function's arguments changed that all usages have also been updated correctly
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• If the PR modifies code that runs when editing or sending messages, I tested and verified there is no unexpected behavior for all supported markdown - URLs, single line code, code blocks, quotes, headings, bold, strikethrough, and italic.
• If the PR modifies a generic component, I tested and verified that those changes do not break usages of that component in the rest of the App (i.e. if a shared library or component like Avatar is modified, I verified that Avatar is working as expected in all cases)
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• I added unit tests for any new feature or bug fix in this PR to help automatically prevent regressions in this user flow.
• If the main branch was merged into this PR after a review, I tested again and verified the outcome was still expected according to the Test steps.

Screenshots/Videos

Android: Native

Android: mWeb Chrome

iOS: Native

iOS: mWeb Safari

MacOS: Chrome / Safari

[codecov]

Codecov Report

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

Files with missing lines	Coverage Δ
...cPressable/implementation/BaseGenericPressable.tsx	79.27% <100.00%> (+0.18%)	⬆️
src/pages/domain/Saml/SamlLoginSectionContent.tsx	0.00% <ø> (ø)
src/pages/settings/Profile/TimezoneInitialPage.tsx	0.00% <ø> (ø)
src/pages/settings/Profile/TimezoneSelectPage.tsx	0.00% <ø> (ø)
...ressable/GenericPressable/implementation/index.tsx	0.00% <0.00%> (ø)
... and 36 files with indirect coverage changes

[truph01]

Link to discussion.