feat(desktop): add dismissible model download toast

[ComputelessComputer]

This change adds a dismissible toast notification for model downloads in the desktop application. The toast is displayed when a model download is required, and the user can dismiss the toast to prevent it from showing again during the current session.

The key changes are:

• Add a state variable to track whether the toast has been dismissed
• Check the dismissed state before showing the toast
• Add a "Dismiss" button to the toast that saves the dismissed state in session storage and dismisses the toast

[coderabbitai]

📝 Walkthrough

Walkthrough

The ModelDownloadNotification component was updated to track if the user has dismissed the model download toast notification using React state and sessionStorage. A "Dismiss" button was added to the toast, and the toast will not reappear during the session after dismissal.

Changes

File(s)	Change Summary
apps/desktop/src/components/toast/model-download.tsx	Added dismissal tracking for the toast notification using state and sessionStorage; added "Dismiss" button; updated effect dependencies.

Sequence Diagram(s)

sequenceDiagram
    participant User
    participant ModelDownloadNotification
    participant sessionStorage
    participant Toast

    User->>ModelDownloadNotification: Component mounts
    ModelDownloadNotification->>sessionStorage: Check dismissal state
    alt Not dismissed
        ModelDownloadNotification->>Toast: Show model download toast
    end

    User->>Toast: Click "Dismiss" button
    Toast->>ModelDownloadNotification: onDismiss handler
    ModelDownloadNotification->>sessionStorage: Set dismissal state
    ModelDownloadNotification->>Toast: Dismiss toast
    ModelDownloadNotification->>ModelDownloadNotification: Update isDismissed state
    ModelDownloadNotification-->>Toast: Prevent future toasts this session

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📥 Commits

Reviewing files that changed from the base of the PR and between af9e500 and 1618eec.

📒 Files selected for processing (1)

• apps/desktop/src/components/toast/model-download.tsx (4 hunks)

🧰 Additional context used

📓 Path-based instructions (1)

**/*.{js,ts,tsx,rs}

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🔇 Additional comments (7)

apps/desktop/src/components/toast/model-download.tsx (7)

2-2: LGTM: Import addition is necessary and correct.

The useState import is properly added for the new dismissal state functionality.

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9-10: LGTM: Good practice using a constant for the storage key.

Using a named constant prevents magic strings and improves maintainability.

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13-15: LGTM: Proper lazy initialization from sessionStorage.

The state initialization correctly reads from sessionStorage using a function for lazy initialization, which is a React best practice.

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75-77: LGTM: Correct placement of dismissal check.

The early return is properly placed to respect the user's dismissal preference while maintaining the existing logic flow.

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102-106: LGTM: Dismiss handler is correctly implemented.

The handler properly updates both local state and sessionStorage, then dismisses the toast immediately.

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128-132: LGTM: Dismiss button is properly configured.

The dismiss button is correctly added as a secondary button with appropriate label and handler.

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136-136: LGTM: Dependency array correctly updated.

Adding isDismissed to the dependency array ensures the effect responds to dismissal state changes, which is necessary for proper React hook behavior.

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