fix: generalize MASTG-TEST-0375 to cover explicit intents

[KirthiSaiT]

This PR closes #3906

Description

MASTG-TEST-0375 was scoped only to implicit intents, but the same trust issue exists with explicit intents targeting external apps. If an app has a dedicated "Attach from Dropbox" button that uses an explicit intent, the data Dropbox returns is still fully controlled by Dropbox — the app should not treat it as trusted without validation.

Changes made to tests-beta/android/MASVS-CODE/MASTG-TEST-0375.md:

• Renamed title from "Missing Validation of Data Returned from Implicit Intents" to "Missing Validation of Data Returned from Inter-App Intent Results"
• Expanded Overview to cover both implicit and explicit intents, with the Dropbox example from the issue
• Updated Steps to instruct testers to cover both implicit flows (file pickers, choosers) and explicit flows (named external app integrations)
• Updated Observation to capture target package/component when the intent is explicit
• Updated Evaluation to make clear the test applies regardless of intent type

AI Tool Disclosure

• This contribution includes AI-generated content.

AI tools used: Claude
Models and versions: Claude Sonnet 4.6
Prompt summary: Analyzed issue #3906 and the existing MASTG-TEST-0375 file, then generalized the title, overview, steps, observation, and evaluation sections to cover both implicit and explicit inter-app intents while preserving the existing style and all cross-references.
Mobile security expertise level: medium

Contributor Checklist

• I have read and understood the contributing guidelines.
• I followed the project style guide.
• I validated the technical correctness of my changes and understand the topic.
• This PR adds clear value and is not spam or low-effort content.

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[github-actions]

Automated moderation result.

Verdict, ai-assisted.
Confidence, 90.

Reasons.
AI tool disclosure provided
Specific AI tools and models mentioned
Well-structured PR description
Changes justified and relevant to the issue
No signs of unreviewed bulk edits

Evidence.

• "[x] This contribution includes AI-generated content.", Clear disclosure of AI content
• "AI tools used: Claude", Specific AI tool mentioned
• "Prompt summary: Analyzed issue Generalize MASTG-TEST-0375 for both implicit and explicit intents #3906", Detailed description of the AI use

Suggested action, Accept the PR as ai-assisted contribution..