fix(session-replay): Update rendering method for fast view rendering

[philprime]

📜 Description

Fix incorrect implementation of fast view rendering in SentryViewRendererV2 by switching from CALayer.draw(in:) to CALayer.render(in:).

Why this matters:

• CALayer.draw(in:) only draws the layer's own contents and does not include sublayers
• CALayer.render(in:) rasterizes the entire visual tree including all sublayers, which is required for accurate session replay snapshots

💡 Motivation and Context

This fixes a regression introduced in PR #4940 where the wrong CALayer method was accidentally merged. The original PR tested CALayer.render(in:) and showed significant performance improvements (~160ms to ~30-36ms on iPhone 8), but CALayer.draw(in:) was merged instead.

For session replay, we need the complete visual representation including all sublayers, making render(in:) the correct choice, even if the fast view renderer is incomplete.

Fixes the incorrect implementation from PR #4940.

💚 How did you test it?

Manual testing with session replay enabled in iOS-Swift sample app.

• Replay with draw(in:)
• Replay with `render(in:)

📝 Checklist

You have to check all boxes before merging:

• I added tests to verify the changes.
• No new PII added or SDK only sends newly added PII if sendDefaultPII is enabled.
• I updated the docs if needed.
• I updated the wizard if needed.
• Review from the native team if needed.
• No breaking change or entry added to the changelog.
• No breaking change for hybrid SDKs or communicated to hybrid SDKs.

[philipphofmann]

LGTM, thanks

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 87.301%. Comparing base (7aaa0b6) to head (1beaa83).
⚠️ Report is 3 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
.../Core/Tools/ViewCapture/SentryViewRendererV2.swift	0.000%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##              main     #6360       +/-   ##
=============================================
+ Coverage   86.818%   87.301%   +0.482%     
=============================================
  Files          438       438               
  Lines        37311     37311               
  Branches     17428     17434        +6     
=============================================
+ Hits         32393     32573      +180     
+ Misses        4874      4693      -181     
- Partials        44        45        +1     

Files with missing lines	Coverage Δ
.../Core/Tools/ViewCapture/SentryViewRendererV2.swift	92.857% <0.000%> (ø)

... and 9 files with indirect coverage changes

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 7aaa0b6...1beaa83. Read the comment docs.

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1217.45 ms	1255.51 ms	38.06 ms
Size	23.75 KiB	989.94 KiB	966.19 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
2ec2700	1238.28 ms	1258.82 ms	20.53 ms
d0f70ce	1226.54 ms	1247.04 ms	20.50 ms
5bf2b17	1213.53 ms	1238.54 ms	25.01 ms
efab7d3	1219.98 ms	1252.12 ms	32.14 ms
e3ebff3	1223.47 ms	1249.27 ms	25.80 ms
7b3399c	1193.35 ms	1227.38 ms	34.03 ms
3133d0e	1237.86 ms	1262.87 ms	25.01 ms
22b6996	1234.00 ms	1263.24 ms	29.24 ms
43597ba	1214.88 ms	1243.52 ms	28.65 ms
fc6557e	1226.40 ms	1249.88 ms	23.48 ms

App size

Revision	Plain	With Sentry	Diff
2ec2700	23.75 KiB	980.80 KiB	957.05 KiB
d0f70ce	23.75 KiB	913.09 KiB	889.34 KiB
5bf2b17	23.75 KiB	913.27 KiB	889.52 KiB
efab7d3	23.75 KiB	912.78 KiB	889.03 KiB
e3ebff3	23.75 KiB	878.48 KiB	854.73 KiB
7b3399c	23.75 KiB	946.68 KiB	922.94 KiB
3133d0e	23.74 KiB	976.79 KiB	953.04 KiB
22b6996	23.75 KiB	908.02 KiB	884.27 KiB
43597ba	23.75 KiB	880.32 KiB	856.58 KiB
fc6557e	23.75 KiB	866.68 KiB	842.93 KiB