feat: convert manualBackupStep1 code to typescript (#24346)

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## **Description**
* Convert manualBackupStep1 component code from javascript to typescript
* Jira: https://consensyssoftware.atlassian.net/browse/SL-438
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## **Related issues**

Fixes:

## **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]
```

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### **Before**

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### **After**


https://github.com/user-attachments/assets/334fb01d-3650-4f2b-9740-d12541e75eb9


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## **Pre-merge author checklist**

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<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> Migrates the `ManualBackupStep1` view to TypeScript and hooks,
simplifying props and improving type safety.
> 
> - Rewrites `index.tsx` to use `useNavigation`, `useRoute`, and
`useDispatch` (removes `connect`/`PropTypes`), adds
`ManualBackupStep1.types.ts` for route/navigation typing
> - Tightens state/function types (e.g., `password`, `words`), adds
`useRef` guard to prevent double init, and improves error handling when
unlocking/exporting SRP
> - Switches image `require` calls to static imports and refactors
navbar setup (explicit `headerRight: undefined`, conditional header
hiding)
> - Updates tests to mock `useRoute`/`useNavigation`, render component
without passing props, and expand coverage for theme variants and
“Remind me later” behavior
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
73da284. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

Author: grvgoel81

app/components/Views/ManualBackupStep1/ManualBackupStep1.types.ts

@@ -0,0 +1,58 @@
+import { RouteProp } from '@react-navigation/native';
+import { StackNavigationProp } from '@react-navigation/stack';
+
+/**
+ * Route params for ManualBackupStep1
+ */
+export interface ManualBackupStep1Params {
+  backupFlow?: boolean;
+  settingsBackup?: boolean;
+  /**
+   * Seed phrase words passed directly from previous screen.
+   * Takes precedence over fetching from keyring.
+   */
+  seedPhrase?: string[];
+  /**
+   * @deprecated Use seedPhrase instead. Kept for backwards compatibility.
+   * Words passed from previous screen as fallback.
+   */
+  words?: string[];
+}
+
+/**
+ * Route params for ManualBackupStep2
+ */
+export interface ManualBackupStep2Params {
+  words: string[];
+  steps: string[];
+  backupFlow: boolean;
+  settingsBackup: boolean;
+}
+
+/**
+ * Param list for backup flow navigation
+ */
+export interface BackupFlowParamList {
+  [key: string]: object | undefined;
+  ManualBackupStep1: ManualBackupStep1Params;
+  ManualBackupStep2: ManualBackupStep2Params;
+  RootModalFlow: { screen: string };
+  OptinMetrics: { onContinue?: () => void };
+  OnboardingSuccessFlow: undefined;
+}
+
+/**
+ * Navigation prop type with proper typing for navigate() calls
+ */
+export type ManualBackupStep1NavigationProp = StackNavigationProp<
+  BackupFlowParamList,
+  'ManualBackupStep1'
+>;
+
+/**
+ * Route prop type
+ */
+export type ManualBackupStep1RouteProp = RouteProp<
+  BackupFlowParamList,
+  'ManualBackupStep1'
+>;