RUMS-5893: Fix NPE when SeekBar thumb is null

[nguyexua]

What does this PR do?

Workflow Automation • View in Workflow Automation

Fixes a crash in Session Replay seek bar mapping when SeekBar.thumb is null by safely skipping thumb wireframe creation. Adds a unit test to verify we still return track wireframes when the thumb is missing.

Motivation

Some SeekBar instances can have a null thumb drawable. The existing mapper unconditionally accessed view.thumb.bounds, which could throw a NullPointerException during recording.

Changes

• Added a null guard in SeekBarWireframeMapper.buildThumbWireframe() to return early when view.thumb is null.
• Reused the resolved non-null thumb instance for bounds access.
• Added SeekBarWireframeMapperTest coverage for the {null thumb, Android O+} case, asserting mapping returns only active/non-active track wireframes.

Testing

• Ran ktlint --format --reporter=json on changed Kotlin files via the lint tool (no issues).
• Attempted to run ./gradlew :features:dd-sdk-android-session-replay:testDebugUnitTest --tests "*SeekBarWireframeMapperTest" but execution is blocked in this sandbox because Gradle wrapper download failed with java.net.NoRouteToHostException.

Additional Notes

This change is intentionally scoped to the Session Replay module and does not alter privacy behavior or public APIs.

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Make sure you discussed the feature or bugfix with the maintaining team in an Issue
• Make sure each commit and the PR mention the Issue number (cf the CONTRIBUTING doc)

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Bits Dev status: ✅ Done

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.06%. Comparing base (cbd94a0) to head (1b9e534).
⚠️ Report is 22 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3419      +/-   ##
===========================================
- Coverage    72.18%   72.06%   -0.12%     
===========================================
  Files          961      961              
  Lines        35407    35408       +1     
  Branches      5880     5881       +1     
===========================================
- Hits         25557    25514      -43     
- Misses        8258     8282      +24     
- Partials      1592     1612      +20     

Files with missing lines	Coverage Δ
...internal/recorder/mapper/SeekBarWireframeMapper.kt	95.65% <100.00%> (+0.10%)	⬆️

... and 31 files with indirect coverage changes

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