Content scanner: scan timeline events for unsafe content

[jmartinesp]

Content

Second iteration of content scanner: scan timeline events and display errors for dangerous ones.

Based on #7139

Motivation and context

Screenshots / GIFs

Tests

• Step 1
• Step 2
• Step ...

Tested devices

• Physical
• Emulator
• OS version(s):

Checklist

• I am aware of the etiquette.
• This PR was made with the help of AI:
  • Yes. In this case, please request a review by Copilot.
  • No.
• Changes have been tested on an Android device or Android emulator with API 24
• UI change has been tested on both light and dark themes
• Accessibility has been taken into account. See https://github.com/element-hq/element-x-android/blob/develop/CONTRIBUTING.md#accessibility
• Pull request is based on the develop branch
• Pull request title will be used in the release note, it clearly defines what will change for the user
• Pull request includes screenshots or videos if containing UI changes
• You've made a self review of your PR

[github-actions]

📱 Scan the QR code below to install the build (arm64 only) for this PR.

If you can't scan the QR code you can install the build via this link: https://i.diawi.com/qjDX1h

[codecov]

Codecov Report

❌ Patch coverage is 75.21815% with 142 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.52%. Comparing base (904d95d) to head (1cb9996).
⚠️ Report is 3 commits behind head on feat/content-scanner-integration.

Files with missing lines	Patch %	Lines
...ontentscanner/impl/DefaultContentScannerService.kt	0.00%	39 Missing ⚠️
...timeline/components/event/TimelineItemVoiceView.kt	80.30%	7 Missing and 6 partials ⚠️
...timeline/components/event/TimelineItemVideoView.kt	83.33%	5 Missing and 5 partials ⚠️
...timeline/components/event/TimelineItemImageView.kt	82.97%	5 Missing and 3 partials ⚠️
...res/contentscanner/impl/di/ContentScannerModule.kt	0.00%	7 Missing ⚠️
...meline/components/event/TimelineItemStickerView.kt	88.88%	4 Missing and 2 partials ⚠️
...android/libraries/textcomposer/ComposerModeView.kt	66.66%	2 Missing and 4 partials ⚠️
...s/impl/timeline/components/TimelineItemEventRow.kt	85.29%	1 Missing and 4 partials ⚠️
...l/timeline/model/event/TimelineItemEventContent.kt	16.66%	5 Missing ⚠️
...tentvalidation/LocalEventContentValidationState.kt	75.00%	1 Missing and 4 partials ⚠️
... and 14 more

Additional details and impacted files

@@                         Coverage Diff                          @@
##           feat/content-scanner-integration    #7159      +/-   ##
====================================================================
- Coverage                             80.58%   80.52%   -0.07%     
====================================================================
  Files                                  2694     2703       +9     
  Lines                                 76518    76848     +330     
  Branches                              10303    10373      +70     
====================================================================
+ Hits                                  61662    61880     +218     
- Misses                                10915    11010      +95     
- Partials                               3941     3958      +17     

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[sonarqubecloud]

Quality Gate passed

Issues
14 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
1.2% Duplication on New Code

See analysis details on SonarQube Cloud