Handle missing contacts provider gracefully when loading avatars

[striker314]

Type of change(s)

• [ o ] Bug fix

What changed and why

App is throwing these errors:

Failed to find provider info for org.fossify.commons.contactsprovider

Right when that happens, Fossify also starts spamming Glide image-load failures in the same area of the log, which looks like contact/avatar loading is failing while the thread view opens.

The contacts provider authority does not seem to be registered in the app, so we should gracefully handle when it is not.

Tests performed

Built and installed onto S25 Ultra:

One UI: v8.0
Android: v16

Closes the following issue(s)

Does not address reported issues. Was hopeful this would resolve issues/204, but the java exception popup still happens. Will continue to debug and provide further code changes if possible to continue chasing that issue.

• Closes #

Checklist

• [ o ] I read the contribution guidelines.
• [ o ] I manually tested my changes on device/emulator (if applicable).
• I updated the "Unreleased" section in CHANGELOG.md (if applicable).
• [ o ] I have self-reviewed my pull request (no typos, formatting errors, etc.).
• [ o ] I understand every change in this pull request.