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This PR fixes the font sizing that was broken due to a design team
update.

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CHANGELOG entry: Fix bug where token selector fonts were too big

Fixes: #27328

```gherkin
Feature: my feature name

  Scenario: user [verb for user action]
    Given [describe expected initial app state]

    When user [verb for user action]
    Then [describe expected outcome]
```

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- [ ] I've followed [MetaMask Contributor
Docs](https://github.com/MetaMask/contributor-docs) and [MetaMask Mobile
Coding
Standards](https://github.com/MetaMask/metamask-mobile/blob/main/.github/guidelines/CODING_GUIDELINES.md).
- [ ] I've completed the PR template to the best of my ability
- [ ] I've included tests if applicable
- [ ] I've documented my code using [JSDoc](https://jsdoc.app/) format
if applicable
- [ ] I've applied the right labels on the PR (see [labeling
guidelines](https://github.com/MetaMask/metamask-mobile/blob/main/.github/guidelines/LABELING_GUIDELINES.md)).
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- [ ] I've manually tested the PR (e.g. pull and build branch, run the
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as recordings and or screenshots.

<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Low Risk**
> Low risk visual-only changes to
`BridgeTokenSelector`/`TokenSelectorItem` typography and icon sizing
with no logic, data, or flow changes.
>
> **Overview**
> Updates the Bridge token selector UI to align with new sizing
guidelines by reducing the info `ButtonIcon` from `Md` to `Sm` and
dialing down token list text variants (e.g., balances and names from
`BodyMD` to `BodySM`, and symbol/balance weights from `BodyMDMedium` to
`BodyMD`).
>
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
684ccd6. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->