Fix Kingfisher cache clearing

[alltheseas]

Summary

fixes kingcache media/image cache clearing bug

Checklist

• I have read (or I am familiar with) the Contribution Guidelines
• I have tested the changes in this PR - *only in Xcode iOS Simulator
• I have profiled the changes to ensure there are no performance regressions, or I do not need to profile the changes.
  • Utilize Xcode profiler to measure performance impact of code changes. See https://developer.apple.com/videos/play/wwdc2025/306
  • If not needed, provide reason:
• I have opened or referred to an existing github issue related to this change: Double-check why kingfisher isn't clearing #2861
• My PR is either small, or I have split it into smaller logical commits that are easier to review
• I have added the signoff line to all my commits. See Signing off your work
• I have added appropriate changelog entries for the changes in this PR. See Adding changelog entries
  • I do not need to add a changelog entry. Reason: [Please provide a reason]
• I have added appropriate Closes: or Fixes: tags in the commit messages wherever applicable, or made sure those are not needed. See Submitting patches

Test report

Tested in Xcode iOS Simulator & MacOS working directory terminal.

If you want to capture logs yourself, run this in a terminal window before pressing the button:

  log stream --level info --style compact --predicate 'subsystem == "com.jb55.damus" && category == "storage"'

  Keep the command running and tap Clear Cache in the simulator; those messages will stream by. That confirms Kingfisher and the cache directory both get cleared.

Device: 17 Pro iOS Simulator

iOS: iOS 26

Damus: 1.15 (1) 8122a8a

Steps: run terminal log stream command above, disable image blur, go to universe view, scroll for 30 seconds to accumulate sufficient media for kingfisher. go to settings -> appearance -> clear cache, verify in terminal

Results:

• [] PASS
• Partial PASS
  • Details: needs on phone confirmation/verificaiton (was not able to compile to my phone)

Other notes

~1 minute of scrolling without blur in universe view generated over 200 MB of kingfisher cache size!

[danieldaquino]

@alltheseas, unfortunately it does not seem like this fixes the main issue. That part of the cache clearing seems to have been working prior to the PR.

I locally downloaded the changes and removed all functional changes — leaving only the new logging code, and reran the test. The results were the same as posted.

Device: iPhone simulator
iOS: iOS 26
Damus: 138f0f2 (Includes only the logs but no functional changes)
Steps:

1. Scroll through the timeline
2. Run log stream --level info --style compact --predicate 'subsystem == "com.jb55.damus" && category == "storage"' to get logs
3. Clear cache in settings

Results: Cache appears to clear; Logs have the same pattern as the PR description

I believe the main issue of #2861 is in a different place and more investigation would be needed to find out where it is and reproduce it.

@jb55, any other thoughts?