test(web): cover clipboard hook

[0takuc0mrade]

What

• Add a shared useCopyToClipboard hook for deterministic clipboard writes.
• Cover copied state toggling and timeout reset with fake timers.
• Cover clipboard rejection behavior.
• Restore clipboard stubs and timers after each test.

Testing

• PASS: npx bun@1.3.13 test --preload ./setup-tests.ts src/shared/hooks/useCopyToClipboard.test.ts
• PARTIAL: npx bun@1.3.13 run --cwd apps/web test started, and the new clipboard tests passed within the full run. The broader suite reported pre-existing failures in src/lib/stellar/horizon.test.ts, src/lib/stellar/explorer.test.ts, and src/shared/components/NumberInput.test.tsx, then the command stopped producing output and was interrupted after several minutes.

Closes #317

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