fix(feedback): Image attachment does not support direct base64 encoded images

[ryan953]

DESCRIBE YOUR PR

If you have a base64 encoded image then it needs to be convered to an arrayBuffer and then passed as a Uint8Array to the server.

Follow up from getsentry/sentry-javascript#12599

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Project	Deployment	Actions	Updated (UTC)
sentry-docs	Ready	Preview, Comment	Feb 13, 2026 4:44pm

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Project	Deployment	Actions	Updated (UTC)
develop-docs	Ignored		Feb 13, 2026 4:44pm