fix: Create expense from QAB after split expense, Confirm page loads infinitely

[TaduJR]

Explanation of Change

Fix 1: Prevent split from corrupting QAB state

When saving a split via "More > Split > Save", updateSplitTransactions calls getMoneyRequestInformation with isSplitExpense: true, but this flag wasn't forwarded as isOneOnOneSplit to buildOnyxDataForMoneyRequest. This caused the if (!isOneOnOneSplit) guard to pass, overwriting NVP_QUICK_ACTION_GLOBAL_CREATE with the split child's context. The other two split paths (completeSplitBill, createSplitsAndOnyxData) already pass isOneOnOneSplit: true correctly — this completes the missing third call site.

Fix 2: Prevent useFocusEffect from overwriting with stale selectedTab

After the corrupted QAB navigates to the MANUAL tab, selectedTab in Onyx is still stale (e.g. "scan"). onTabSelected fires correctly with "manual", but useFocusEffect fires immediately after with transactionRequestType still derived from the stale selectedTab, overwriting the correct type. A ref tracks when onTabSelected has already handled initialization, and the useFocusEffect skips until transactionRequestType catches up.

Fixed Issues

$ #85932
PROPOSAL: #85932 (comment)

Tests

1. Open app
2. Create expense via global (+) > Create expense > Manual tab > enter amount > select workspace > create expense
3. Create expense via global (+) > Create expense > Scan tab > scan receipt > create expense
4. Edit an existing expense amount, verify edit saves correctly
5. Tap on the edited expense at step 4 > More > Split > Save
6. Tap back button to return Inbox
7. Tap Create expense at Quick Action Button and create a manual expense
8. Verify the Confirm page loads successfully (no infinite spinner)

• Verify that no errors appear in the JS console

Offline tests

Same as tests

QA Steps

// TODO: These must be filled out, or the issue title must include "[No QA]."
Same as tests

• 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
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• I included screenshots or videos for tests on all platforms
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  • Android: Native
  • Android: mWeb Chrome
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Screenshots/Videos

Android: Native

Android-Native.mp4

Android: mWeb Chrome

Android-mWeb.mp4

iOS: Native

iOS-Native.mp4

iOS: mWeb Safari

iOS-Safari.mp4

MacOS: Chrome / Safari

Mac-Chrome.mp4

[melvin-bot]

@ZhenjaHorbach Please copy/paste the Reviewer Checklist from here into a new comment on this PR and complete it. If you have the K2 extension, you can simply click: [this button]