refactor(react-sdk): organize token hooks into domain folders (#181)

* refactor(react-sdk): organize token hooks into domain folders

Move hooks from flat token/ into categorized folders:
- authorization/ (allow, revoke, session)
- balance/ (confidential balance, activity feed, optimistic updates)
- transfer/ (confidential transfer, approve)
- shield/ (shield, approve underlying, allowance)
- unshield/ (unshield, resume)
- unwrap/ (unwrap, finalize)
- delegation/ (delegate decryption, revoke delegation, status)
- token/ (metadata, discovery, fees, supply, core token hooks)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix(react-sdk): correct mock path in useConfidentialBalances enabled test

The test was mocking @tanstack/react-query's useQuery directly, but the
implementation imports from utils/query wrapper. Updated mock to target
the correct module path.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* chore: remove obsolete plan and design documents

These implementation plans and design docs served their purpose during
development and are no longer needed.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix(playwright): increase webServer timeouts to 120s to reduce CI flakiness

The anvil deploy + forge script step can exceed 60s on slow CI runners,
causing sporadic "Timed out waiting 60000ms from config.webServer" failures.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

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Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: ghermet