fix(replay): Post checkCanRecord to main thread to prevent deadlock

[romtsn]

Summary

• onScreenshotRecorded can run on the replay executor thread (PixelCopy masked-capture and emit paths). checkCanRecord() → pauseInternal() acquires lifecycleLock — if another thread holds that lock and submits to the same single-threaded executor, we deadlock.
• Post checkCanRecord() to the main looper so it never runs on the executor thread.

This was a pre-existing issue introduced with SurfaceView capturing (masked-capture path calls onScreenshotRecorded from executor at PixelCopyStrategy.kt:209), and is also relevant for PR #5808 which adds the emitLastScreenshot executor path.

Test plan

• Existing onScreenshotRecorded pauses replay when rate-limited for sessions test updated to idle looper
• ./gradlew :sentry-android-replay:testReleaseUnitTest --tests="*ReplayIntegrationTest*" passes

🤖 Generated with Claude Code

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[sentry]

📲 Install Builds

Android

🔗 App Name	App ID	Version	Configuration
SDK Size	io.sentry.tests.size	8.50.0 (1)	release

⚙️ sentry-android Build Distribution Settings

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Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	327.07 ms	408.58 ms	81.52 ms
Size	0 B	0 B	0 B

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
22f4345	307.87 ms	354.51 ms	46.64 ms
8c7718c	307.42 ms	374.84 ms	67.42 ms
bb0ff41	321.00 ms	378.28 ms	57.28 ms
c8125f3	397.65 ms	485.14 ms	87.49 ms
eb95ded	317.51 ms	369.08 ms	51.57 ms
f634d01	375.06 ms	420.04 ms	44.98 ms
9fbb112	359.71 ms	421.85 ms	62.14 ms
d501a7e	307.33 ms	341.94 ms	34.61 ms
bb0ff41	317.76 ms	384.66 ms	66.90 ms
9054d65	330.94 ms	403.24 ms	72.30 ms

App size

Revision	Plain	With Sentry	Diff
22f4345	1.58 MiB	2.29 MiB	719.83 KiB
8c7718c	0 B	0 B	0 B
bb0ff41	0 B	0 B	0 B
c8125f3	1.58 MiB	2.10 MiB	532.32 KiB
eb95ded	0 B	0 B	0 B
f634d01	1.58 MiB	2.10 MiB	533.40 KiB
9fbb112	1.58 MiB	2.11 MiB	539.18 KiB
d501a7e	0 B	0 B	0 B
bb0ff41	0 B	0 B	0 B
9054d65	1.58 MiB	2.29 MiB	723.38 KiB

Previous results on branch: rz/fix/replay-checkcanrecord-deadlock

Startup times

Revision	Plain	With Sentry	Diff
ba152d2	346.75 ms	440.34 ms	93.59 ms

App size

Revision	Plain	With Sentry	Diff
ba152d2	0 B	0 B	0 B