feat: solana wallet

[Asem-Abdelhady]

Summary

• Add Solana wallet connection support (Phantom and Solflare) to the intent issuance UI
• New SolanaWalletButton component renders a wallet picker + connect/disconnect button inline in the IssueIntent settings card
• SolanaWalletStore (Svelte 5 reactive class) wraps @solana/wallet-adapter-* and exposes connected, publicKey, connect(), disconnect()
• When a Solana wallet connects and the Solana Recipient field is empty, it is auto-filled with the wallet's public key
• hooks.client.ts polyfills Buffer globally for the Solana adapter libraries which depend on Node's Buffer in the browser

Test plan

• Open the app in testnet mode and set an EVM→Solana output token (e.g. Solana Devnet USDC)
• Confirm the "Solana Wallet" row appears in the settings card
• Click "Connect Solana", pick Phantom (or Solflare) — wallet extension approval prompt should appear
• After approval the button shows the truncated pubkey (e.g. AbC1…xYz9) in green
• Confirm the Solana Recipient field is auto-filled with that public key
• Click ✕ to disconnect — pubkey clears, button reverts to wallet picker
• With no Solana output selected, confirm the "Solana Wallet" row is still rendered (always visible) but submission guard still works for missing Solana recipient when needed

Linear ticket

V2-117

Expected output

Screen.Recording.2026-04-07.at.7.25.12.PM.mov

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