Client-generated encrypted thumbnails (web)

[codebestia]

Description:
For images/video, generate a thumbnail client-side, encrypt it as its own file (#167), and embed its fileId + key in the parent message payload. Render thumbnails inline after decryption.

Acceptance criteria:

• Thumbnails generated + encrypted client-side
• Embedded by reference in the file message
• Inline preview after local decrypt

[Michvista]

@Michvista has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Please assign this issue to me

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Michvista to this issue.

[almuslavish]

@almuslavish has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

i would like to work on this issue pls

ℹ️ Repo Maintainers: To accept this application, review their application or assign @almuslavish to this issue.