feat(#323): stream gifting UI with gift message and shareable link

[Vincent6581]

Summary

Closes #323

Adds a dedicated stream gifting UI — a modal that lets users create a pre-paid stream as a gift for another user, complete with an optional personal message and a shareable link to share with the recipient.

Changes

New component: components/GiftStreamModal.tsx

Three-step flow:

Step 1 (form)

• Recipient address input with Stellar address validation
• Token selector (USDC, XLM, AQUA, yXLM)
• Total amount field
• Unlock duration: preset buttons (7d, 30d, 90d, 1y) plus custom day input
• Optional gift message textarea (280-char limit)
• Validates that recipient != sender

Step 2 (confirming)

• Spinner while sorostream.createStream() resolves

Step 3 (done)

• Success screen with the new stream ID
• Shareable gift link (/stream/{streamId}) with Copy button
• Link to view the stream directly

Gift messages are persisted in localStorage under sorostream-gift-messages keyed by stream ID, using exported helpers getGiftMessage() / saveGiftMessage().

Modified: src/app/dashboard/page.tsx

• Import GiftStreamModal and add showGiftModal state
• Add a "Gift a Stream" button (purple, with gift emoji) to the dashboard header alongside the New Stream button
• Render <GiftStreamModal> when showGiftModal is true

Modified: src/app/stream/[id]/page.tsx

• Import getGiftMessage from GiftStreamModal
• Add giftMessage state, loaded on mount from localStorage
• Render a prominent purple banner ("You received a gift stream!") with the message when giftMessage is set

Acceptance Criteria

• Gift creation form accessible from the dashboard (Gift a Stream button in header)
• Gift message stored in localStorage keyed by stream ID
• Shareable gift link generated on confirmation
• Gift message visible on the recipient stream detail page (purple banner)
• Form validates that recipient is not the sender

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