feat(predict): update liveline chart foundation (#30003)

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## **Description**
This PR updates the shared Liveline chart foundation used by the Predict
crypto up/down work. It makes the React Native wrapper and WebView
template support imperative live-point updates, queued messages before
chart readiness, native loading behavior, and safer callback handling.

# TODO
1. This PR is stack item 1/3 and should merge before #30004 and #30005.
2. Keep this PR as draft until the stacked PRs are validated and all
required checks are passing.

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## **Changelog**

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## **Related issues**

Fixes: N/A - stacked Predict crypto up/down implementation split from
#29436.

## **Manual testing steps**

```gherkin
Feature: Liveline chart foundation

  Scenario: chart initializes and accepts live data updates
    Given a Predict screen renders a Liveline chart with historical data

    When the chart WebView becomes ready and live price points arrive
    Then the chart remains mounted and updates without showing an error state
```

## **Screenshots/Recordings**

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before and after of your change. -->

### **Before**

N/A

### **After**

N/A

## **Pre-merge author checklist**

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- [x] 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).
- [x] I've completed the PR template to the best of my ability
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guidelines](https://github.com/MetaMask/metamask-mobile/blob/main/.github/guidelines/LABELING_GUIDELINES.md)).
Not required for external contributors.

#### Performance checks (if applicable)

- [ ] I've tested on Android
  - Ideally on a mid-range device; emulator is acceptable
- [ ] I've tested with a power user scenario
- Use these [power-user
SRPs](https://consensyssoftware.atlassian.net/wiki/spaces/TL1/pages/edit-v2/401401446401?draftShareId=9d77e1e1-4bdc-4be1-9ebb-ccd916988d93)
to import wallets with many accounts and tokens
- [ ] I've instrumented key operations with Sentry traces for production
performance metrics
- See [`trace()`](/app/util/trace.ts) for usage and
[`addToken`](/app/components/Views/AddAsset/components/AddCustomToken/AddCustomToken.tsx#L274)
for an example

For performance guidelines and tooling, see the [Performance
Guide](https://consensyssoftware.atlassian.net/wiki/spaces/TL1/pages/400085549067/Performance+Guide+for+Engineers).

## **Pre-merge reviewer checklist**

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- [ ] I've manually tested the PR (e.g. pull and build branch, run the
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- [ ] I confirm that this PR addresses all acceptance criteria described
in the ticket it closes and includes the necessary testing evidence such
as recordings and or screenshots.

<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Medium Risk**
> Moderate risk because it changes the RN↔WebView messaging contract and
rendering flow (adds queued imperative updates and live-mode state),
which could affect chart correctness, loading states, and performance.
> 
> **Overview**
> Updates `LivelineChart` to support an imperative ref API
(`appendPoint`, `clearData`) that sends incremental WebView messages,
queues them until `CHART_READY`, and flushes deterministically before
firing `onChartReady`.
> 
> Extends the RN↔WebView protocol and template to handle
`APPEND_POINT`/`CLEAR_DATA`, maintain a live-mode data buffer with
merge/trim behavior, and optionally hide in-chart controls via the new
`hideControls` prop (CSS body class).
> 
> Adjusts loading and callback handling: keeps a native loading overlay
while `loading` is true, stabilizes `onMessage` while always using
latest callback props, and adds dev-only `PERF` telemetry logging plus
expanded unit tests for the new behaviors.
> 
> <sup>Reviewed by [Cursor Bugbot](https://cursor.com/bugbot) for commit
ce2a7e2. Bugbot is set up for automated
code reviews on this repo. Configure
[here](https://www.cursor.com/dashboard/bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: ghgoodreau