Add profile pictures from files

[arpitagarwal1301]

What does this change?

Adds a file option to the profile image editor while preserving the existing URL flow.

Selected image documents must decode successfully before preview. Read access is persisted only when the edit is applied, and an inaccessible document falls back to the account's default avatar. Replaced and deleted document grants are released only after no account still references them.

This review revision follows the requested architecture by exposing the profile-image picker through CommonActivity. Each initialized activity owns its lifecycle-safe launcher, while stale picker results and superseded validation requests are ignored. Account UI call sites no longer thread picker callbacks through adapters and dialogs.

The edit icon also has a content description and explicit D-pad focus navigation while retaining its existing touch background.

Closes #3079

Testing

• :app:compileStableDebugKotlin
• :app:testStableDebugUnitTest (8 tests, 0 failures)
• :app:lintStableDebug (0 errors)
• git diff --check

Limitations

• The system picker, activity recreation, and TV focus path were not exercised with UI instrumentation or on physical hardware.
• The optional internal-file copy was not added; unavailable external documents fall back to the default avatar.

AI disclosure

AI-assisted: implementation and review used OpenAI Codex; the listed checks were run on the submitted code.

[fire-light42]

Thank you for you contribution! Great job on the new feature!

Overall good code, but there are some minor nitpicks.

[arpitagarwal1301]

Addressed the requested Activity Result API, image/* MIME, string alias, and toast placement changes in f59858c. I kept internal file copying out of scope as noted optional; persisted document permissions and the existing fallback remain in place. Ready for re-review when convenient.

[fire-light42]

Great job!

Unfortunately passing around a variable to 100 subclasses is a bit too messy, but I realize you did it for a lack of a better solution, there is no good solution after all.

I would really want you to register one global variable in CommonActivity like this: https://github.com/recloudstream/cloudstream/blob/master/app/src/main/java/com/lagradost/cloudstream3/CommonActivity.kt#L254-L266
This is how we solved a similar problem previously, I failed to send it though :(

It should be a pretty easy change thankfully. This way we do not have to pass around the variable everywhere. After these changes it should be fully done and ready to merge. Sorry for the added difficulties 😢