fix: allow files with # to be uploaded, show upload confirmation

[tefkah]

Issue(s) Resolved

Files with a # in their name couldnt be uploaded.
Also when you uploaded a file during the submission workflow it wouldnt show confirmation you succeeded.

Test Plan

Screenshots (if applicable)

Optional

Notes/Context/Gotchas

Supporting Docs

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Pull request overview

Copilot reviewed 8 out of 8 changed files in this pull request and generated 6 comments.

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client/utils/upload.ts:77

• Only rawFileName is sanitized, but fileExtension can still contain URL-reserved characters (e.g. image.jpg#2 yields fileExtension === "jpg#2"). That reintroduces the same #/fragment issue in both the S3 key and verification/download URLs. Consider sanitizing the extension (or encoding the URL when verifying/downloading).

	const fileName = rawFileName.replace(/[^a-zA-Z0-9\-_.]+/g, '_');
	const random = Math.floor(Math.random() * 8);
	const now = new Date().getTime();
	const pubSegment = pubId ? `/p${pubId}` : '';
	return `${testPrefix}c${communityId}${pubSegment}/u${userId}/${fileName}-${random}${now}.${fileExtension}`;