feat: link to Core Webs Halliday flow from Bridge

[meeh0w]

Description

• CP-9594
• Related PR: https://github.com/ava-labs/core-web/pull/104

Changes

• Adds a banner on the Bridge screen, which links to Core Web's Bridge flow with Halliday dialog opened (adds ?useHalliday=1 param)
  • When dismissed, the banner should not appear again
  • Togglable by feature flag: halliday-bridge-banner

Testing

• ⚠️ The production version of Core Web does not have the Halliday integration yet.
• ⚠️ The staging version of Core Web does not have the handling for useHalliday=1 query param yet (it's added by https://github.com/ava-labs/core-web/pull/104, so you can test that particular behavior with the version linked in that PR's comments)

1. Enable feature flags if disabled
2. Verify that Halliday banner appears on the Bridge screen
   2a. Verify that clicking the banner redirects you to core.app/bridge?useHalliday=1
   2b. Verify that dismissing the banner hides it for good (until a wallet reset happens)
3. Verify that disabling feature flags turns both functionalities off (no banner on Bridge & clicking Buy does not add the ?useHalliday=1 param anymore)

Screenshots:

⚠️ Ignore the buy flow.

Screen.Recording.2025-01-07.at.14.30.38.mov

Checklist for the author

• I've covered new/modified business logic with Jest test cases.
• I've tested the changes myself before sending it to code review and QA.

[bferenc]

working as described 👏