test: add activity amount check for send flow

[DanielSinclair]

Fixes BX-1855

Summary

• ensure send amount is captured and compared against Activity list
• define send flow input amount as constant

Testing

• CI=1 yarn lint
• CI=1 yarn typecheck
• CI=1 yarn vitest:send (fails: Could not validate chrome version. Binary may not be installed)

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https://chatgpt.com/codex/tasks/task_e_68c058ed406c8325af6ac36ceb0e1de2

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PR-Codex overview

This PR focuses on improving the transaction handling and UI display in the application, particularly in the transaction title resolution and the send flow tests.

Detailed summary

• In src/core/utils/transactions.ts, changed the title resolution to always use 'pending'.
• In src/entries/popup/pages/home/Activity/ActivitiesList.tsx, introduced resolvedTitle for displaying the activity title.
• Updated the send flow test to include setting an amount and verifying it.
• Enhanced tests to check for pending and sent transaction states in the Activity.

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[linear]

BX-1855 E2e coverage of Send amounts/balances for core, custom networks