refactor(FileDisplayActivity): extract file resolution and clarify ac…

[joshtrichards]

…count init logic

Addresses CI/CD detekt output:

/home/runner/actions-runner/_work/android/android/app/src/main/java/com/owncloud/android/ui/activity/FileDisplayActivity.kt - 20min debt
	LongMethod - 62/60 - [The function initFile is too long (62). The maximum length is 60.] at /home/runner/actions-runner/_work/android/android/app/src/main/java/com/owncloud/android/ui/activity/FileDisplayActivity.kt:2805:17

• Extracted the file selection and validation logic into a dedicated helper method (resolveCurrentFile)
• Renamed initFile to initializeCurrentFile for clarity
• Dropped no-op conditional parameter from updateActionBarTitleAndHomeButton() call.
• Clarified and documented process when initializing file state and user/account changes, with improved KDoc and targeted comments.
• Slightly simplified conditional UI refresh logic.
• Preserved all core functionality and app behavior; this is a structural refactor with no functional impact.

• Tests written, or not not needed

[github-actions]

Codacy

SpotBugs

Category	Base	New
Bad practice	42	42
Correctness	74	74
Dodgy code	257	257
Experimental	1	1
Internationalization	7	7
Malicious code vulnerability	2	2
Multithreaded correctness	34	34
Performance	43	43
Security	18	18
Total	478	478

[github-actions]

blue-Light-Screenshot test failed, but no output was generated. Maybe a preliminary stage failed.

[github-actions]

APK file: https://www.kaminsky.me/nc-dev/android-artifacts/16461.apk



To test this change/fix you can simply download above APK file and install and test it in parallel to your existing Nextcloud app.