Strip metadata from images/icons/emojis uploaded

[winged-pegasus]

For privacy reasons, any images, emojis, or icons uploaded should be stripped of their metadata.

[lamat1111]

Heads-up on where this stands after ~4 months of master moving:

Most of the surfaces this targets now strip metadata on master already, as a side effect of the compress/re-encode pipeline that was added since:

• Message image attachments — re-encoded via ImageManipulator (JPEG) when over the size threshold; pickers also pass exif: false.
• Profile avatars — compressAvatarImage re-encodes to JPEG.
• Space icons (SpaceSettingsModal) and skins (SkinEditor) — same re-encode.

The one real remaining gap was the Farcaster Cloudflare upload (uploadImageToCloudflare / uploadImageForCast), which posted the raw URI un-stripped. I've picked that up in #129 (small targeted fix + exif: false on the onboarding picker, no new deps).

Two notes for if you revisit this branch: it forces SaveFormat.JPEG on emojis/stickers, which would flatten PNG transparency — emoji/sticker re-encodes should stay PNG. And it has committed modules/quorum-crypto/android/build/** and .idea/** artifacts that inflate the diff. Given master has diverged on imageAttachment.ts and ProfileModal.tsx, this likely won't rebase cleanly. Probably cleanest to close this in favour of #129 plus any small follow-up, but leaving it to you since it's your draft.