chore: remove importSrpWordSuggestion remote config flag (MetaMask#28139)

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## **Description**
* Removes the `importSrpWordSuggestion` remote flag and all code that
read it. The BIP39 word-suggestion bar experiment is complete, so the
app no longer depends on remote config flag for that UI.
* Jra: https://consensyssoftware.atlassian.net/browse/TO-647

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1. What is the reason for the change?
2. What is the improvement/solution?
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## **Changelog**

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CHANGELOG entry: Import SRP screens always show BIP39 word suggestions
when the keyboard is open, with no remote feature flag

## **Related issues**

Fixes:

## **Manual testing steps**

```gherkin
Feature: Import SRP BIP39 word suggestions bar

 Scenario: Onboarding import wallet shows word suggestions while typing SRP
    Given the user is on Import from SRP
    And the keyboard is open
    When the user types partial words in the SRP field
    Then BIP39 word suggestions are shown and can be selected

  Scenario: Import new SRP (multi-SRP) shows word suggestions while typing
    Given the user is on Import New SRP
    And the keyboard is open
    When the user types partial words in the SRP field
    Then BIP39 word suggestions are shown and can be selected

```

## **Screenshots/Recordings**

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

### **Before**

<!-- [screenshots/recordings] -->

### **After**


https://github.com/user-attachments/assets/8426a0a8-11d6-4f24-8eb6-b98208f584af



https://github.com/user-attachments/assets/11bf056f-a203-4fd1-a90c-27fa27982d76


<!-- [screenshots/recordings] -->

## **Pre-merge author checklist**

- [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
- [x] I've included tests if applicable
- [x] I've documented my code using [JSDoc](https://jsdoc.app/) format
if applicable
- [x] 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]
> **Medium Risk**
> Moderate risk because it changes onboarding wallet-import UI behavior
and removes a remote kill-switch, but the logic change is small and
localized to SRP import screens and flag plumbing.
> 
> **Overview**
> Removes the `importSrpWordSuggestion` remote feature flag end-to-end
(feature flag enum entry, selector implementation + tests, and registry
entry).
> 
> Updates both SRP import flows (`ImportFromSecretRecoveryPhrase` and
`ImportNewSecretRecoveryPhrase`) to *always* render `SrpWordSuggestions`
when the keyboard is visible (and on step 0 where applicable), and drops
the associated feature-flag mocks from the screen tests.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
24f7f6a. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

Author: grvgoel81

app/components/Views/ImportFromSecretRecoveryPhrase/index.js

@@ -15,7 +15,7 @@ import {
   Platform,
 } from 'react-native';
 import { SafeAreaView } from 'react-native-safe-area-context';
-import { connect, useSelector } from 'react-redux';
+import { connect } from 'react-redux';
 import {
   KeyboardAwareScrollView,
   KeyboardProvider,
@@ -96,7 +96,6 @@ import {
 import { v4 as uuidv4 } from 'uuid';
 import SrpInputGrid from '../../UI/SrpInputGrid';
 import SrpWordSuggestions from '../../UI/SrpWordSuggestions';
-import { selectImportSrpWordSuggestionEnabledFlag } from '../../../selectors/featureFlagController/importSrpWordSuggestion';
 
 const SCREEN_WIDTH = Dimensions.get('window').width;
 
@@ -137,11 +136,6 @@ const ImportFromSecretRecoveryPhrase = ({
   const slideAnim = useRef(new Animated.Value(0)).current;
   const [currentInputWord, setCurrentInputWord] = useState('');
 
-  // Feature flag for SRP word suggestions
-  const isSrpWordSuggestionsEnabled = useSelector(
-    selectImportSrpWordSuggestionEnabledFlag,
-  );
-
   const isKeyboardVisible = useKeyboardState((state) => state.isVisible);
 
   const { fetchAccountsWithActivity } = useAccountsWithNetworkActivitySync({
@@ -845,21 +839,19 @@ const ImportFromSecretRecoveryPhrase = ({
           </Button>
         </Box>
       )}
-      {isSrpWordSuggestionsEnabled &&
-        currentStep === 0 &&
-        isKeyboardVisible && (
-          <KeyboardStickyView
-            offset={{ closed: 0, opened: 0 }}
-            style={tw.style('absolute bottom-0 left-0 right-0')}
-          >
-            <SrpWordSuggestions
-              currentInputWord={currentInputWord}
-              onSuggestionSelect={(word) => {
-                srpInputGridRef.current?.handleSuggestionSelect(word);
-              }}
-            />
-          </KeyboardStickyView>
-        )}
+      {currentStep === 0 && isKeyboardVisible && (
+        <KeyboardStickyView
+          offset={{ closed: 0, opened: 0 }}
+          style={tw.style('absolute bottom-0 left-0 right-0')}
+        >
+          <SrpWordSuggestions
+            currentInputWord={currentInputWord}
+            onSuggestionSelect={(word) => {
+              srpInputGridRef.current?.handleSuggestionSelect(word);
+            }}
+          />
+        </KeyboardStickyView>
+      )}
       <ScreenshotDeterrent enabled isSRP />
     </SafeAreaView>
   );

app/components/Views/ImportFromSecretRecoveryPhrase/index.test.tsx

@@ -94,13 +94,6 @@ const initialState = {
   },
 };
 
-jest.mock(
-  '../../../selectors/featureFlagController/importSrpWordSuggestion',
-  () => ({
-    selectImportSrpWordSuggestionEnabledFlag: () => true,
-  }),
-);
-
 const mockIsEnabled = jest.fn().mockReturnValue(true);
 
 jest.mock('../../hooks/useAnalytics/useAnalytics', () => {

app/components/Views/ImportNewSecretRecoveryPhrase/index.test.tsx

@@ -141,14 +141,6 @@ const initialState = {
   },
 };
 
-// Mock the feature flag selector to return true
-jest.mock(
-  '../../../selectors/featureFlagController/importSrpWordSuggestion',
-  () => ({
-    selectImportSrpWordSuggestionEnabledFlag: () => true,
-  }),
-);
-
 describe('ImportNewSecretRecoveryPhrase', () => {
   afterEach(() => {
     jest.clearAllMocks();

app/components/Views/ImportNewSecretRecoveryPhrase/index.tsx

@@ -53,7 +53,6 @@ import Logger from '../../../util/Logger';
 import { v4 as uuidv4 } from 'uuid';
 import SrpInputGrid, { SrpInputGridRef } from '../../UI/SrpInputGrid';
 import SrpWordSuggestions from '../../UI/SrpWordSuggestions';
-import { selectImportSrpWordSuggestionEnabledFlag } from '../../../selectors/featureFlagController/importSrpWordSuggestion';
 import { isSRPLengthValid, SPACE_CHAR } from '../../../util/srp/srpInputUtils';
 import {
   validateSRP,
@@ -78,11 +77,6 @@ const ImportNewSecretRecoveryPhrase = () => {
   const [error, setError] = useState('');
   const [currentInputWord, setCurrentInputWord] = useState('');
 
-  // Feature flag for SRP word suggestions
-  const isSrpWordSuggestionsEnabled = useSelector(
-    selectImportSrpWordSuggestionEnabledFlag,
-  );
-
   const isKeyboardVisible = useKeyboardState((state) => state.isVisible);
 
   const hdKeyrings = useSelector(selectHDKeyrings);
@@ -329,7 +323,7 @@ const ImportNewSecretRecoveryPhrase = () => {
           {strings('import_new_secret_recovery_phrase.cta_text')}
         </Button>
       </Box>
-      {isSrpWordSuggestionsEnabled && isKeyboardVisible && (
+      {isKeyboardVisible && (
         <KeyboardStickyView
           offset={{ closed: 0, opened: 0 }}
           style={tw.style('absolute bottom-0 left-0 right-0')}

app/constants/featureFlags.ts

@@ -10,7 +10,6 @@ export enum FeatureFlagNames {
   otaUpdatesEnabled = 'otaUpdatesEnabled',
   rewardsEnableMusdHolding = 'rewardsEnableMusdHolding',
   fullPageAccountList = 'fullPageAccountList',
-  importSrpWordSuggestion = 'importSrpWordSuggestion',
   assetsDefiPositionsEnabled = 'assetsDefiPositionsEnabled',
   tokenDetailsV2Buttons = 'tokenDetailsV2Buttons',
   tokenDetailsV2ButtonLayout = 'tokenDetailsV2ButtonLayout',