fix: empty catch blocks silently swallow errors

[Meet-hybrid]

Closes #10

Several catch blocks discarded the caught error without logging or notifying the user:

• src/app/demo/vault/list/page.tsx — copyId clipboard errors
• src/components/modules/vault/hooks/use-vault-setup.ts — saveComputedDid() errors in useEffect, copyToClipboard unhandled rejection
• src/layouts/Header.tsx — handleConnect / handleDisconnect wallet errors

Changes

• Every failure path now logs (console.warn) and shows a user-facing sonner toast
• navigator.clipboard.writeText is awaited and wrapped in try/catch
• No empty catch {} blocks remain in the affected files

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