macOS cache

[pgilfernandez]

Hi @rodlie,

I've been trying to improve the experience of working with video within Friction under macOS. I used IA to see if it could do it and, after some tests I think it got better.
Have a look at the code and get the ideas, it may have fixed/improved some issues:

This PR improves macOS video/cache stability in Friction.

It fixes several cache-related issues that could cause crashes or stale frames when working with video previews or rendering animations to video on macOS.

## Changes

- Hardened HDD cache save/load handling against missing or failed tasks.
- Moved temporary cache files to Friction’s app temp directory on macOS.
- Added safer handling for missing temporary cache files.
- Prevented invalid image/audio cache entries from being reused.
- Fixed scene frame cache invalidation when the canvas changes.
- Fixed video rendering when cached/rendered frame sizes differ from the codec size.
- Added a macOS memory usage fallback when `TASK_VM_INFO` is unavailable.

I hope it helps ☺️

[rodlie]

Thanks, will do a review when I get the time (sometime this week).

[rodlie]

Did a quick test of d076942, and it "fixes" the main cache issue on macOS, but it's still a weird one and I still don't know the rot of the issue, anyway a good workaround 👍

I think we just run invalidateSceneFramesCache if macOS as it's not needed elsewhere. I will do some minor changes.

---

Will check the rest later.

[pgilfernandez]

it sounds great!

[rodlie]

I cherry-picked d076942 to main and added a check for macOS.

[rodlie]

I took two changes from videoencoder.cpp into this 13b5c1b