feat: update omni network and native token logo to nomina (#22816)

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## **Description**

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1. What is the reason for the change?
2. What is the improvement/solution?
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Omni Network (OMNI) has been rebranded to Nomina (NOM). This PR changes
the network name, native currency and icons for the network.

## **Changelog**

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CHANGELOG entry: change Omni Network name and logo to Nomina with native
currency NOM.

## **Related issues**

Fixes: NA

## **Manual testing steps**

Go to the MetaMask Mobile app
1/ Navigate to "chainList.org" search for "Nomina" and click add new
network.

RPC URL : https://mainnet.nomina.io
Chain Name : Nomina
Currency Symbol: NOM
Chain ID: 166 (0xa6)

2/ Check that the logo of the network is displayed correctly in the
dropdown and on bottom-right of tokens.
3/ Check that the native token is NOM with Nomina logo.

## **Screenshots/Recordings**

<!-- If applicable, add screenshots and/or recordings to visualize the
before and after of your change. -->

### **Before**

<img
src="https://github.com/user-attachments/assets/d85393f1-dcc4-4abe-b084-ab91c92ee22d"
width="200">

### **After**

<img
src="https://github.com/user-attachments/assets/197e6c4c-a116-49be-9ec7-b9fa5ac8a27a"
width="200">
<img
src="https://github.com/user-attachments/assets/8b1326b9-364a-41f1-9562-e833e014dc9c"
width="200">


## **Pre-merge author checklist**

- [ ] 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)).
Not required for external contributors.

## **Pre-merge reviewer checklist**

- [ ] I've manually tested the PR (e.g. pull and build branch, run the
app, test code being changed).
- [ ] 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]
> Replaces Omni with Nomina across network constants, currency symbol,
and icon mappings (chain ID 166/NOM).
> 
> - **Networks/Constants**
>   - Add `NETWORKS_CHAIN_ID.NOMINA` (`0xa6` / `166`).
> - Map `CURRENCY_SYMBOL_BY_CHAIN_ID[NOMINA]` to `NOM` and add `NOMINA:
'NOM'` in `CHAINLIST_CURRENCY_SYMBOLS_MAP` (`app/constants/network.js`).
> - **Images/Icons**
> - Replace Omni token/icon with Nomina: import `nomina.png` and expose
`NOM: NOMINA` in `app/images/image-icons.js`.
> - **Custom Networks**
>   - Rename `OMNI` to `NOMINA` in `NETWORK_CHAIN_ID` (`0xa6`).
> - Update image mapping to use `../../images/nomina.png` for
`NETWORK_CHAIN_ID.NOMINA` (`app/util/networks/customNetworks.tsx`).
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
f04f7dc. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

Author: maxime-oe

app/constants/network.js

@@ -63,6 +63,7 @@ export const NETWORKS_CHAIN_ID = {
   INJECTIVE: toHex('1776'),
   PLASMA: toHex('9745'),
   CRONOS: toHex('25'),
+  NOMINA: toHex('166'),
 };
 
 // To add a deprecation warning to a network, add it to the array
@@ -101,6 +102,7 @@ export const CHAINLIST_CURRENCY_SYMBOLS_MAP = {
   PLASMA: 'XPL',
   CRONOS: 'CRO',
   HYPE: 'HYPE',
+  NOMINA: 'NOM',
 };
 
 export const CURRENCY_SYMBOL_BY_CHAIN_ID = {
@@ -135,6 +137,7 @@ export const CURRENCY_SYMBOL_BY_CHAIN_ID = {
   [NETWORKS_CHAIN_ID.PLASMA]: CHAINLIST_CURRENCY_SYMBOLS_MAP.PLASMA,
   [NETWORKS_CHAIN_ID.CRONOS]: CHAINLIST_CURRENCY_SYMBOLS_MAP.CRONOS,
   [NETWORKS_CHAIN_ID.HYPER_EVM]: CHAINLIST_CURRENCY_SYMBOLS_MAP.HYPE,
+  [NETWORKS_CHAIN_ID.NOMINA]: CHAINLIST_CURRENCY_SYMBOLS_MAP.NOMINA,
 };
 
 export const TEST_NETWORK_IDS = [

app/images/image-icons.js

@@ -41,7 +41,7 @@ import APECHAIN_TOKEN from './apechain-token.png';
 import BERACHAIN_TOKEN from './berachain-token.png';
 import EDU from './edu.png';
 import ABSTRACT from './abstract.png';
-import OMNI_TOKEN from './omni-token.png';
+import NOMINA from './nomina.png';
 import FRAX from './frax.png';
 import XDC from './xdc.png';
 import MEGAETH_MAINNET from './megaeth-mainnet-logo.png';
@@ -107,7 +107,7 @@ export default {
   BERA: BERACHAIN_TOKEN,
   EDU,
   ABSTRACT,
-  OMNI: OMNI_TOKEN,
+  NOM: NOMINA,
   HL,
   FRAX,
   XDC,

app/images/nomina.png

@@ -354,7 +354,7 @@ export const NETWORK_CHAIN_ID: {
   readonly BERACHAIN: '0x138de';
   readonly EDU: '0xa3c3';
   readonly ABSTRACT: '0xab5';
-  readonly OMNI: '0xa6';
+  readonly NOMINA: '0xa6';
   readonly XRPLEVM: '0x15f900';
   readonly FRAXTAL: '0xfc';
   readonly XDC: '0x32';
@@ -389,7 +389,7 @@ export const NETWORK_CHAIN_ID: {
   BERACHAIN: '0x138de',
   EDU: '0xa3c3',
   ABSTRACT: '0xab5',
-  OMNI: '0xa6',
+  NOMINA: '0xa6',
   XRPLEVM: '0x15f900',
   FRAXTAL: '0xfc',
   XDC: '0x32',
@@ -429,7 +429,7 @@ export const CustomNetworkImgMapping: Record<Hex, string> = {
   [NETWORK_CHAIN_ID.BERACHAIN]: require('../../images/berachain.png'),
   [NETWORK_CHAIN_ID.EDU]: require('../../images/edu.png'),
   [NETWORK_CHAIN_ID.ABSTRACT]: require('../../images/abstract.png'),
-  [NETWORK_CHAIN_ID.OMNI]: require('../../images/omni.png'),
+  [NETWORK_CHAIN_ID.NOMINA]: require('../../images/nomina.png'),
   [NETWORK_CHAIN_ID.XRPLEVM]: require('../../images/xrplevm.png'),
   [NETWORK_CHAIN_ID.FRAXTAL]: require('../../images/fraxtal.png'),
   [NETWORK_CHAIN_ID.XDC]: require('../../images/xdc.png'),