[Frontend] StreamDetailsModal: progress NaN on zero deposit + close button missing aria-label

[ogazboiz]

Telegram: https://t.me/+DOylgFv1jyJlNzM0

Why this matters

frontend/src/components/dashboard/StreamDetailsModal.tsx:

1. const progress = (stream.withdrawn / stream.deposited) * 100; — when deposited === 0, this is NaN/Infinity, producing an invalid progress-bar width.
2. The close (X) button has no aria-label, so screen readers announce it as an unlabeled button (other modals in the app label theirs aria-label="Close").

Acceptance criteria

• Guard the progress calc: deposited > 0 ? (withdrawn / deposited) * 100 : 0, clamped to 0–100
• Add aria-label="Close" to the X button
• (Optional) add role="dialog"/aria-modal consistent with the modal-a11y issue

Files to touch

• frontend/src/components/dashboard/StreamDetailsModal.tsx

Out of scope

• Stream-detail page progress bar (separate issue).

[Pee-pheelips]

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[Joycejay17]

@Joycejay17 has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

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