feat: add activities page

[effie-ms]

Which Linear task is linked to this PR?

https://linear.app/lifi-linear/issue/EMB-320/merge-active-transactions-and-transaction-history

Why was it implemented this way?

The separate Active Transactions and Transaction History pages have been merged into a single Activities page. This unified view renders all transaction states — pending/failed local routes and completed API history — in one chronologically sorted list.

• useTransactionList hook builds a unified, sorted list of three item types (active, local, history).
• useDeduplicateRoutes removes local items once they appear in history.
• useRouteExecutionIndicators extracts pending/failed indicator logic (for the button on the main page leading to the "Activities" page).
• The ActiveTransactionItem shows live step status (pending spinner, action-required info, failed error) with an inline execution timer and a delete button for failed routes.

Visual showcase (Screenshots or Videos)

Screen.Recording.2026-03-25.at.15.26.50.mov

Checklist before requesting a review

• I have performed a self-review and testing of my code.
• This pull request is focused and addresses a single problem.

[github-actions]

Hey! This is your new endpoint: https://6abae1ed.widget-featactivi.pages.dev

[github-actions]

Hey! This is your new endpoint: https://91d12bb6.widget-featactivi.pages.dev

[github-actions]

Hey! This is your new endpoint: https://39a0d204.widget-featactivi.pages.dev

[github-actions]

Hey! This is your new endpoint: https://e8ee81b0.widget-featactivi.pages.dev

[github-actions]

Hey! This is your new endpoint: https://bcf5d7b5.widget-featactivi.pages.dev

[github-actions]

Hey! This is your new endpoint: https://798c4975.widget-featactivi.pages.dev

[github-actions]

Hey! This is your new endpoint: https://64be43dc.widget-featactivi.pages.dev

[github-actions]

Hey! This is your new endpoint: https://cf49c6f2.widget-featactivi.pages.dev