fix(ui): wire back button on sign-up code and collect-field screens

[texxo]

Summary of changes

The back button on two sign-up screens renders but does nothing.

ClerkThemedAuthScaffold defaults to onBackPressed: () -> Unit = {} with hasBackButton: Boolean = true,
so any call site that omits onBackPressed draws a chevron that silently no-ops.
SignUpCodeView and SignUpCollectFieldView both omitted it — every other auth screen passes authState::navigateBack. System back/gesture works on these screens, which is why only the button appears broken.

Verified on samples/prebuilt-ui: back now returns from the code screen to auth start, and from the
create-password screen to the code screen. Sign-in flow unchanged.

PS: this issue of non-working back-button only effects android, because the verification chain is different between the two native platforms.

Note

[!NOTE]

Wire back button on sign-up code and collect-field screens

Passes onBackPressed callbacks wired to authState.navigateBack() in SignUpCodeView.kt and SignUpCollectFieldView.kt. Previously, the back button had no effect on these screens.

^{Macroscope summarized 5c715b3.}

Summary by CodeRabbit

• Bug Fixes
  • Added consistent back-navigation support to the sign-up verification and information-entry screens.
  • Pressing the back button now returns users to the previous authentication step.

[coderabbitai]

📝 Walkthrough

Walkthrough

Back-button handling is added to the themed authentication scaffolds in the sign-up code and field-collection views, delegating navigation to the authentication state.

Changes

Sign-up navigation

Layer / File(s)	Summary
Wire sign-up back navigation source/ui/src/main/java/com/clerk/ui/signup/code/SignUpCodeView.kt, source/ui/src/main/java/com/clerk/ui/signup/collectfield/SignUpCollectFieldView.kt	Both sign-up scaffolds now provide back-press callbacks that invoke authState.navigateBack().

Estimated code review effort: 1 (Trivial) | ~3 minutes

Suggested reviewers: swolfand

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title is concise and clearly describes the main change: wiring the sign-up back button on two screens.
Description check	✅ Passed	The description includes the required Summary of changes section and clearly explains the bug, fix, and verification.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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