fix(android): Handle default-package ANR frame modules (JAVA-696)

[0xadam-brown]

📜 Description

Updates ThreadDumpParser so ANR frames for classes in Java's default package are emitted with the correct module name.

Prior to this PR, when the parser saw a Java or JNI frame whose class has no package, it would reconstruct the frame's module as though a package existed. That turned a class like MainActivity into null.MainActivity.

This PR fixes that by teaching ThreadDumpParser to build the module name conditionally:

• if a package name is present, emit package.class
• if no package name is present, emit just class

The same logic is applied consistently to both Java frames and JNI frames, since both parsing paths share the same optional-package shape.

💡 Motivation and Context

Absent this PR, we'd see:

• an invalid synthetic module name for default-package classes;
• distored downstream in-app classification, since that logic depends on the module name; and
• internally inconsistent parsed ANR frames, where the function, file, and line point at one class but the module name points at another, non-existent one.

resolves: JAVA-696

💚 How did you test it?

TDD-style unit tests.

📝 Checklist

• I added GH Issue ID & Linear ID
• 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.
• Public API changes reviewed by another Mobile SDK team member or implemented according to the develop docs spec.

🔮 Next steps

[linear-code]

JAVA-696

[sentry]

📲 Install Builds

Android

🔗 App Name	App ID	Version	Configuration
SDK Size	io.sentry.tests.size	8.53.0 (1)	release

⚙️ sentry-android Build Distribution Settings

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	354.23 ms	458.84 ms	104.61 ms
Size	0 B	0 B	0 B

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
fc5ccaf	322.49 ms	405.25 ms	82.76 ms
fcec2f2	328.91 ms	387.75 ms	58.84 ms
f064536	327.04 ms	405.35 ms	78.31 ms
0eaac1e	320.04 ms	369.52 ms	49.48 ms
1edbdfa	364.77 ms	450.29 ms	85.52 ms
057ba36	305.64 ms	379.43 ms	73.79 ms
ad8da22	362.98 ms	453.94 ms	90.96 ms
d15471f	369.38 ms	459.08 ms	89.70 ms
926b414	319.88 ms	362.02 ms	42.14 ms
d15471f	302.62 ms	353.84 ms	51.22 ms

App size

Revision	Plain	With Sentry	Diff
fc5ccaf	1.58 MiB	2.13 MiB	557.54 KiB
fcec2f2	1.58 MiB	2.12 MiB	551.50 KiB
f064536	1.58 MiB	2.20 MiB	633.90 KiB
0eaac1e	1.58 MiB	2.19 MiB	619.17 KiB
1edbdfa	1.58 MiB	2.20 MiB	635.34 KiB
057ba36	0 B	0 B	0 B
ad8da22	1.58 MiB	2.29 MiB	719.83 KiB
d15471f	1.58 MiB	2.13 MiB	559.54 KiB
926b414	0 B	0 B	0 B
d15471f	1.58 MiB	2.13 MiB	559.54 KiB