feat: migrate assets to plattform

[janek26]

Adds Platform API integration for asset balances

Fixes BX-2026
Fixes BX-2027

What changed (plus any additional context for devs)

• Added a new Platform API integration for fetching asset balances
• Created a new HTTP client for the Platform API with proper authentication
• Implemented conversion utilities to transform Platform API responses to our existing format
• Updated the user assets query function to use the new Platform API
• Added TypeScript types for the Platform API responses
• Added environment variable for Platform API key

What to test

• Verify that asset balances are correctly fetched and displayed using the new Platform API
• Check that stale balances are properly handled with the new implementation
• Ensure that error handling works correctly when the Platform API fails
• Confirm that the conversion from Platform API response format to our existing format preserves all necessary data
• Test that chain-specific asset queries work properly with the new implementation

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PR-Codex overview

This PR introduces support for a new platformValue feature in the asset management system, allowing for additional asset pricing information from a new API. It updates various components, types, and utilities to integrate this feature seamlessly.

Detailed summary

• Added PLATFORM_API_KEY to .env.example and .env.d.ts.
• Introduced platformHttp in src/core/network/platform.ts.
• Updated ParsedUserAsset interface to include platformValue.
• Enhanced asset parsing functions to handle platformValue.
• Modified asset-related tests to validate platformValue.
• Updated UI components to display platformValue prominently.
• Created utility functions for comparing platform and calculated values.
• Integrated API calls to fetch asset updates from the new platform API.

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[janek26]

• chore: cleanup platform refactor #2090
• feat: migrate activities to plattform #2087
• feat: migrate assets to plattform #2086 👈 (View in Graphite)
• master

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[sentry-io]

🔍 Existing Issues For Review

Your pull request is modifying functions with the following pre-existing issues:

📄 File: src/core/resources/assets/userAssets.ts

Function	Unhandled Issue
userAssetsQueryFunction	Error: HTTP Client Error with status code: 502 /p... Event Count: 1 Affected Users: 14
userAssetsQueryFunction	Error: HTTP Client Error with status code: 504 /p... Event Count: 1 Affected Users: 1

[linear]

BX-2026 Move multi-chain assets endpoint ownership to Platform

BX-2027 Move per-chain asset fetch endpoint to Platform

[DanielSinclair]

directory name mismatch

[DanielSinclair]

Seeing a few errors (tested up to the transaction migration in the stack):

Token data doesn't look prod ready; think we need to hold-off on this until the backend endpoint is more usable

Token values/filtering and frontend handling:

Chart smoothing looks like there is an issue (I think this explains the SVG error):