chore: set user timezone in chart (#29654)

## **Description**

The advanced chart time axis was always displaying in UTC regardless of
the user's locale.

**Root cause:** The
[`timezone`](https://www.tradingview.com/charting-library-docs/latest/api/interfaces/Charting_Library.ChartingLibraryWidgetOptions#timezone)
property was missing from the `TradingView.widget` constructor. When
omitted, falls back to the symbol's [`resolveSymbol`
timezone](https://www.tradingview.com/charting-library-docs/latest/connecting_data/Symbology#time-zone)
— hardcoded to `Etc/UTC` for our crypto data.

**Fix:** Detect the user's timezone via
`Intl.DateTimeFormat().resolvedOptions().timeZone` and pass it to the
widget constructor. The value is validated against [TradingView's
supported timezone
list](https://www.tradingview.com/charting-library-docs/latest/ui_elements/timezones/#supported-time-zones)
with a fallback to `Etc/UTC`.

Note: the `timezone: 'Etc/UTC'` in `resolveSymbol` is unchanged, it
declares data alignment, which is separate from the display timezone.

## **Changelog**

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CHANGELOG entry: Fixed advanced chart displaying timestamps in UTC
instead of the user's local timezone

## **Related issues**

Fixes: https://consensyssoftware.atlassian.net/browse/ASSETS-3141

## **Manual testing steps**

```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]
```

## **Screenshots/Recordings**

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before and after of your change. -->

### **Before**

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### **After**

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## **Pre-merge author checklist**

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- [ ] I've followed [MetaMask Contributor
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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
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<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Low Risk**
> Low risk: only affects AdvancedChart display settings by passing a
validated `timezone` into the TradingView widget, with a safe fallback
to `Etc/UTC` if detection/mapping fails.
> 
> **Overview**
> Fixes AdvancedChart timestamps always rendering in UTC by **detecting
the user’s device timezone**
(`Intl.DateTimeFormat().resolvedOptions().timeZone`) and passing it to
`TradingView.widget` via the `timezone` option.
> 
> Adds a whitelist of TradingView-supported IANA timezone IDs plus a
small canonical-to-TradingView alias map, and **falls back to
`Etc/UTC`** when the device timezone is unsupported or detection throws
(applied in both `chartLogic.js` and the injected
`chartLogicString.ts`).
> 
> <sup>Reviewed by [Cursor Bugbot](https://cursor.com/bugbot) for commit
5496398. Bugbot is set up for automated
code reviews on this repo. Configure
[here](https://www.cursor.com/dashboard/bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

Author: sahar-fehri

app/components/UI/Charts/AdvancedChart/webview/chartLogic.js

@@ -3579,6 +3579,125 @@ function initChart() {
           }
         : undefined;
 
+    // TradingView only supports a fixed set of IANA timezone IDs.
+    // If the device returns an unsupported ID we fall back to Etc/UTC.
+    // List of supported timezones:  https://www.tradingview.com/charting-library-docs/latest/ui_elements/timezones#supported-time-zones
+    var TV_SUPPORTED_TIMEZONES = [
+      'Etc/UTC',
+      'Africa/Cairo',
+      'Africa/Casablanca',
+      'Africa/Johannesburg',
+      'Africa/Lagos',
+      'Africa/Nairobi',
+      'Africa/Tunis',
+      'America/Anchorage',
+      'America/Argentina/Buenos_Aires',
+      'America/Bogota',
+      'America/Caracas',
+      'America/Chicago',
+      'America/El_Salvador',
+      'America/Halifax',
+      'America/Juneau',
+      'America/Lima',
+      'America/Los_Angeles',
+      'America/Mexico_City',
+      'America/New_York',
+      'America/Phoenix',
+      'America/Santiago',
+      'America/Sao_Paulo',
+      'America/Toronto',
+      'America/Vancouver',
+      'Asia/Astana',
+      'Asia/Ashkhabad',
+      'Asia/Bahrain',
+      'Asia/Bangkok',
+      'Asia/Chongqing',
+      'Asia/Colombo',
+      'Asia/Dhaka',
+      'Asia/Dubai',
+      'Asia/Ho_Chi_Minh',
+      'Asia/Hong_Kong',
+      'Asia/Jakarta',
+      'Asia/Jerusalem',
+      'Asia/Karachi',
+      'Asia/Kabul',
+      'Asia/Kathmandu',
+      'Asia/Kolkata',
+      'Asia/Kuala_Lumpur',
+      'Asia/Kuwait',
+      'Asia/Manila',
+      'Asia/Muscat',
+      'Asia/Nicosia',
+      'Asia/Qatar',
+      'Asia/Riyadh',
+      'Asia/Seoul',
+      'Asia/Shanghai',
+      'Asia/Singapore',
+      'Asia/Taipei',
+      'Asia/Tehran',
+      'Asia/Tokyo',
+      'Asia/Yangon',
+      'Atlantic/Azores',
+      'Atlantic/Reykjavik',
+      'Australia/Adelaide',
+      'Australia/Brisbane',
+      'Australia/Perth',
+      'Australia/Sydney',
+      'Europe/Amsterdam',
+      'Europe/Athens',
+      'Europe/Belgrade',
+      'Europe/Berlin',
+      'Europe/Bratislava',
+      'Europe/Brussels',
+      'Europe/Bucharest',
+      'Europe/Budapest',
+      'Europe/Copenhagen',
+      'Europe/Dublin',
+      'Europe/Helsinki',
+      'Europe/Istanbul',
+      'Europe/Lisbon',
+      'Europe/London',
+      'Europe/Luxembourg',
+      'Europe/Madrid',
+      'Europe/Malta',
+      'Europe/Moscow',
+      'Europe/Oslo',
+      'Europe/Paris',
+      'Europe/Prague',
+      'Europe/Riga',
+      'Europe/Rome',
+      'Europe/Stockholm',
+      'Europe/Tallinn',
+      'Europe/Vienna',
+      'Europe/Vilnius',
+      'Europe/Warsaw',
+      'Europe/Zurich',
+      'Pacific/Auckland',
+      'Pacific/Chatham',
+      'Pacific/Fakaofo',
+      'Pacific/Honolulu',
+      'Pacific/Norfolk',
+      'US/Mountain',
+    ];
+
+    // Intl returns canonical IANA names, but TradingView uses some legacy aliases.
+    var CANONICAL_TO_TV = {
+      'America/Denver': 'US/Mountain',
+      'Asia/Ashgabat': 'Asia/Ashkhabad',
+      'Asia/Almaty': 'Asia/Astana',
+    };
+
+    var userTimezone = (function () {
+      try {
+        var tz = Intl.DateTimeFormat().resolvedOptions().timeZone || 'Etc/UTC';
+        var mapped = CANONICAL_TO_TV[tz] || tz;
+        return TV_SUPPORTED_TIMEZONES.indexOf(mapped) !== -1
+          ? mapped
+          : 'Etc/UTC';
+      } catch (_e) {
+        return 'Etc/UTC';
+      }
+    })();
     window.chartWidget = new TradingView.widget({
       symbol: window.currentSymbol,
       interval: window.currentResolution || '5',
@@ -3587,6 +3706,7 @@ function initChart() {
       datafeed: customDatafeed,
       library_path: window.CONFIG.libraryUrl,
       locale: 'en',
+      timezone: userTimezone,
       fullscreen: false,
       autosize: true,
       theme: 'Dark',

app/components/UI/Charts/AdvancedChart/webview/chartLogicString.ts

@@ -3588,6 +3588,125 @@ function initChart() {
           }
         : undefined;
 
+    // TradingView only supports a fixed set of IANA timezone IDs.
+    // If the device returns an unsupported ID we fall back to Etc/UTC.
+    // List of supported timezones:  https://www.tradingview.com/charting-library-docs/latest/ui_elements/timezones#supported-time-zones
+    var TV_SUPPORTED_TIMEZONES = [
+      'Etc/UTC',
+      'Africa/Cairo',
+      'Africa/Casablanca',
+      'Africa/Johannesburg',
+      'Africa/Lagos',
+      'Africa/Nairobi',
+      'Africa/Tunis',
+      'America/Anchorage',
+      'America/Argentina/Buenos_Aires',
+      'America/Bogota',
+      'America/Caracas',
+      'America/Chicago',
+      'America/El_Salvador',
+      'America/Halifax',
+      'America/Juneau',
+      'America/Lima',
+      'America/Los_Angeles',
+      'America/Mexico_City',
+      'America/New_York',
+      'America/Phoenix',
+      'America/Santiago',
+      'America/Sao_Paulo',
+      'America/Toronto',
+      'America/Vancouver',
+      'Asia/Astana',
+      'Asia/Ashkhabad',
+      'Asia/Bahrain',
+      'Asia/Bangkok',
+      'Asia/Chongqing',
+      'Asia/Colombo',
+      'Asia/Dhaka',
+      'Asia/Dubai',
+      'Asia/Ho_Chi_Minh',
+      'Asia/Hong_Kong',
+      'Asia/Jakarta',
+      'Asia/Jerusalem',
+      'Asia/Karachi',
+      'Asia/Kabul',
+      'Asia/Kathmandu',
+      'Asia/Kolkata',
+      'Asia/Kuala_Lumpur',
+      'Asia/Kuwait',
+      'Asia/Manila',
+      'Asia/Muscat',
+      'Asia/Nicosia',
+      'Asia/Qatar',
+      'Asia/Riyadh',
+      'Asia/Seoul',
+      'Asia/Shanghai',
+      'Asia/Singapore',
+      'Asia/Taipei',
+      'Asia/Tehran',
+      'Asia/Tokyo',
+      'Asia/Yangon',
+      'Atlantic/Azores',
+      'Atlantic/Reykjavik',
+      'Australia/Adelaide',
+      'Australia/Brisbane',
+      'Australia/Perth',
+      'Australia/Sydney',
+      'Europe/Amsterdam',
+      'Europe/Athens',
+      'Europe/Belgrade',
+      'Europe/Berlin',
+      'Europe/Bratislava',
+      'Europe/Brussels',
+      'Europe/Bucharest',
+      'Europe/Budapest',
+      'Europe/Copenhagen',
+      'Europe/Dublin',
+      'Europe/Helsinki',
+      'Europe/Istanbul',
+      'Europe/Lisbon',
+      'Europe/London',
+      'Europe/Luxembourg',
+      'Europe/Madrid',
+      'Europe/Malta',
+      'Europe/Moscow',
+      'Europe/Oslo',
+      'Europe/Paris',
+      'Europe/Prague',
+      'Europe/Riga',
+      'Europe/Rome',
+      'Europe/Stockholm',
+      'Europe/Tallinn',
+      'Europe/Vienna',
+      'Europe/Vilnius',
+      'Europe/Warsaw',
+      'Europe/Zurich',
+      'Pacific/Auckland',
+      'Pacific/Chatham',
+      'Pacific/Fakaofo',
+      'Pacific/Honolulu',
+      'Pacific/Norfolk',
+      'US/Mountain',
+    ];
+
+    // Intl returns canonical IANA names, but TradingView uses some legacy aliases.
+    var CANONICAL_TO_TV = {
+      'America/Denver': 'US/Mountain',
+      'Asia/Ashgabat': 'Asia/Ashkhabad',
+      'Asia/Almaty': 'Asia/Astana',
+    };
+
+    var userTimezone = (function () {
+      try {
+        var tz = Intl.DateTimeFormat().resolvedOptions().timeZone || 'Etc/UTC';
+        var mapped = CANONICAL_TO_TV[tz] || tz;
+        return TV_SUPPORTED_TIMEZONES.indexOf(mapped) !== -1
+          ? mapped
+          : 'Etc/UTC';
+      } catch (_e) {
+        return 'Etc/UTC';
+      }
+    })();
     window.chartWidget = new TradingView.widget({
       symbol: window.currentSymbol,
       interval: window.currentResolution || '5',
@@ -3596,6 +3715,7 @@ function initChart() {
       datafeed: customDatafeed,
       library_path: window.CONFIG.libraryUrl,
       locale: 'en',
+      timezone: userTimezone,
       fullscreen: false,
       autosize: true,
       theme: 'Dark',