feat(google-auth): add forceAccountPicker option for explicit account selection

[sbaiahmed1]

resolves: #9
resolves: #8

• Introduced a new forceAccountPicker parameter to skip silent sign-in.
• Updated iOS implementation to handle this behavior.
• Documented the new option in the TypeScript interface.

[sourcery-ai]

Reviewer's Guide

Adds an iOS-level forceAccountPicker option that, when configured, bypasses silent sign-in and always presents the Google account picker, and documents this option in the TypeScript configuration interface.

Sequence diagram for iOS Google sign-in with forceAccountPicker

sequenceDiagram
    actor User
    participant ReactNativeApp
    participant NativeModule
    participant GoogleAuth
    participant GIDSignIn
    participant GoogleAccountPicker

    User->>ReactNativeApp: Initiate_google_sign_in()
    ReactNativeApp->>NativeModule: GoogleAuth_signIn()
    NativeModule->>GoogleAuth: signIn(resolve, reject)

    alt forceAccountPicker_enabled
        GoogleAuth->>GoogleAuth: check_forceAccountPicker
        GoogleAuth->>GoogleAccountPicker: performInteractiveSignIn(presentingViewController, resolve, reject)
        GoogleAccountPicker-->>GoogleAuth: user_selected_account(user)
        GoogleAuth->>NativeModule: resolve(user_data)
        NativeModule->>ReactNativeApp: return_user_data
        ReactNativeApp->>User: Show_signed_in_state
    else forceAccountPicker_disabled
        GoogleAuth->>GIDSignIn: restorePreviousSignIn(callback)
        alt silent_sign_in_success
            GIDSignIn-->>GoogleAuth: previous_user(user)
            GoogleAuth->>NativeModule: resolve(user_data)
            NativeModule->>ReactNativeApp: return_user_data
            ReactNativeApp->>User: Show_signed_in_state
        else silent_sign_in_failed_or_no_user
            GIDSignIn-->>GoogleAuth: error_or_nil
            GoogleAuth->>GoogleAccountPicker: performInteractiveSignIn(presentingViewController, resolve, reject)
            GoogleAccountPicker-->>GoogleAuth: user_selected_account(user)
            GoogleAuth->>NativeModule: resolve(user_data)
            NativeModule->>ReactNativeApp: return_user_data
            ReactNativeApp->>User: Show_signed_in_state
        end
    end

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Updated class diagram for GoogleAuth and ConfigureParams

classDiagram
    class GoogleAuth {
        <<objc_class>>
        +static shared: GoogleAuth
        -isConfigured: Bool
        -configuredScopes: [String]
        -forceAccountPicker: Bool
        -init()
        +configure(params: NSDictionary, resolve: RCTPromiseResolveBlock, reject: RCTPromiseRejectBlock)
        +signIn(resolve: RCTPromiseResolveBlock, reject: RCTPromiseRejectBlock)
        -performInteractiveSignIn(presentingViewController: UIViewController, resolve: RCTPromiseResolveBlock, reject: RCTPromiseRejectBlock)
        -handleSignInSuccess(user: GIDGoogleUser, resolve: RCTPromiseResolveBlock)
        -getPresentingViewController(): UIViewController
    }

    class ConfigureParams {
        <<typescript_interface>>
        +iosClientId: string
        +webClientId: string
        +scopes: string[]
        +openIdRealm: string
        +forceAccountPicker: boolean
    }

    ConfigureParams <.. GoogleAuth : used_for_configuration

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File-Level Changes

Change	Details	Files
Persist and use a forceAccountPicker flag in iOS GoogleAuth to control sign-in flow.	Introduce a new forceAccountPicker Boolean property on the GoogleAuth singleton with default false. Read forceAccountPicker from configure params and store it on the instance when configuring, logging its value. In the signIn method, when forceAccountPicker is true, bypass restorePreviousSignIn and immediately perform interactive sign-in with the presenting view controller.	ios/GoogleAuth.swift
Expose the forceAccountPicker configuration option in the TypeScript interface for consumers.	Extend ConfigureParams with an optional forceAccountPicker?: boolean field. Document the behavior, default value, and iOS-only platform restriction for the new forceAccountPicker option.	src/NativeGoogleAuth.ts

Possibly linked issues

• If already signed in and if I have multiple google accounts signed into the device, the library takes in the previously signed in account and ignores the modal altogether #9: PR introduces forceAccountPicker that skips silent sign-in and shows the account picker, fixing the reported iOS behavior.

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[sourcery-ai]

Hey there - I've reviewed your changes - here's some feedback:

• The forceAccountPicker flag is stored on the singleton at configuration time and then used for all subsequent sign-ins; consider making this a per-sign-in option (or resetting it after use) so one call with forceAccountPicker: true doesn’t unintentionally affect all future calls.
• The new print statements for forceAccountPicker change runtime logging behavior; consider using a conditional or a dedicated logging mechanism so these messages don’t appear in production logs by default.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The `forceAccountPicker` flag is stored on the singleton at configuration time and then used for all subsequent sign-ins; consider making this a per-sign-in option (or resetting it after use) so one call with `forceAccountPicker: true` doesn’t unintentionally affect all future calls.
- The new `print` statements for `forceAccountPicker` change runtime logging behavior; consider using a conditional or a dedicated logging mechanism so these messages don’t appear in production logs by default.

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