feat: add standardized useActionToast hook for irreversible actions

[wagmiiii]

Closes #379

Summary

Added a centralized standard for displaying success and failure toasts during irreversible actions (sign, send, approve, and delete).

What changed

• src/config/toastMessages.ts: Landed the notification string constants in a single place to ensure consistency across the application.
• src/hooks/useActionToast.ts: Added a new hook that wraps promises for these specific actions. It automatically unwraps the success result to fire a success toast, or catches failures to fire a danger toast before re-throwing the error so local UI state can be managed correctly.
• docs/STATE_MANAGEMENT.md: Updated the Toast behavior guide to direct developers to use this hook instead of manual addToast calls for irreversible actions.

(Note: Because the UI features for these specific actions haven't been implemented yet, this PR focuses on fulfilling the issue's requirements at the infrastructure level so that they can be reused everywhere once those features land without enforcing manual try/catch workarounds.)

Acceptance Criteria Checklist

• The change matches the summary above.
• No regression in the existing test suite (added dedicated test suite for the new hook).
• The change is documented where it is observable (docs/STATE_MANAGEMENT.md).
• Lint, type-check, and tests all pass locally.
• PR description references this issue with Closes #.

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