feature: Added update notification and download links per platform

[PartyDonut]

Pull Request Description

Implements a update notification the user can disable if wanted.
Only gives a notification because updating desktop with the different amount of packages would be less then trivial.

Updates are shown on mobile devices but no notification by default because the update using appstores.

Issue Being Fixed

Resolves #154

[sourcery-ai]

Reviewer's Guide

This PR adds a GitHub‐based update checker that polls for new releases, stores user preferences in the settings model, and surfaces update notifications and download links in the UI per platform.

Sequence diagram for Automatic Update Check Process

sequenceDiagram
    participant Timer
    participant UpdateProvider
    participant ClientSettingsProvider
    participant UpdateChecker
    participant GitHubAPI
    participant HasNewUpdateProvider
    participant SettingsUserIcon

    Timer->>UpdateProvider: Triggers periodic check (_fetchLatest)
    UpdateProvider->>ClientSettingsProvider: Read checkForUpdates setting
    alt checkForUpdates is true
        UpdateProvider->>UpdateChecker: fetchRecentReleases()
        UpdateChecker->>GitHubAPI: GET /repos/{owner}/{repo}/releases
        GitHubAPI-->>UpdateChecker: Release data (JSON)
        UpdateChecker-->>UpdateProvider: List~ReleaseInfo~
        UpdateProvider->>UpdateProvider: Update state (UpdatesModel)
        alt New update found AND (lastViewedUpdate != latestRelease.version)
            UpdateProvider->>HasNewUpdateProvider: Update state (true)
            HasNewUpdateProvider->>SettingsUserIcon: Update UI (show indicator)
        end
    end

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Sequence diagram for User Viewing Update Details and Interaction

sequenceDiagram
    actor User
    participant SettingsScreen
    participant AboutSettingsRoute
    participant SettingsUpdateInformation
    participant UpdateProvider
    participant ClientSettingsProvider
    participant Browser

    User->>SettingsScreen: Navigates to Settings
    SettingsScreen->>HasNewUpdateProvider: Check for new update status
    alt New update available (via HasNewUpdateProvider)
        SettingsScreen-->>User: Displays "New Release Found" card
        User->>SettingsScreen: Taps "New Release Found" card (navigates to About)
    else User navigates to "About" directly
        User->>SettingsScreen: Taps "About" section
    end
    SettingsScreen->>AboutSettingsRoute: Navigate
    AboutSettingsRoute->>SettingsUpdateInformation: Display
    SettingsUpdateInformation->>UpdateProvider: Get UpdatesModel (releases)
    UpdateProvider-->>SettingsUpdateInformation: UpdatesModel
    SettingsUpdateInformation-->>User: Show release list (versions, changelogs, download links)
    opt User views latest release details
        SettingsUpdateInformation->>ClientSettingsProvider: update(lastViewedUpdate = latestRelease.version)
        ClientSettingsProvider-->>ClientSettingsProvider: Persist change
        SettingsUpdateInformation->>HasNewUpdateProvider: (Potentially causes update to false)
    end
    opt User clicks download link
        User->>SettingsUpdateInformation: Taps download link for a release
        SettingsUpdateInformation->>Browser: Opens GitHub URL for download
    end
    opt User toggles update check setting
        User->>SettingsUpdateInformation: Toggles "Check for Updates" switch
        SettingsUpdateInformation->>ClientSettingsProvider: update(checkForUpdates = newValue)
        ClientSettingsProvider-->>ClientSettingsProvider: Persist change
    end

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File-Level Changes

Change	Details	Files
Extend client settings model to track update preferences	Introduce checkForUpdates and lastViewedUpdate fields in the freezed model Wire up JSON serialization and default values for the new fields Include the new properties in copyWith, toString, diagnostics, equality	lib/models/settings/client_settings_model.freezed.dart lib/models/settings/client_settings_model.g.dart lib/models/settings/client_settings_model.dart
Implement utility to fetch and parse GitHub releases	Create UpdateChecker to fetch releases via GitHub API Define ReleaseInfo with version comparison and platform‐specific download URL grouping Add extension to prettify download key labels	lib/util/update_checker.dart
Create Riverpod providers for update polling and notification	Add Update notifier with periodic polling and state management Define UpdatesModel and a hasNewUpdateProvider to expose notification flag Cancel timers when disabling update checks	lib/providers/update_provider.dart lib/providers/update_provider.freezed.dart lib/providers/update_provider.g.dart
Integrate update UI elements across the app	Overlay an info badge on the user icon when a new update is available Display a new release card in settings if an update exists Embed a SettingsUpdateInformation section in the About page with toggle and expandable changelog entries	lib/widgets/navigation_scaffold/components/settings_user_icon.dart lib/screens/settings/settings_screen.dart lib/screens/settings/about_settings_page.dart lib/screens/settings/widgets/settings_update_information.dart lib/widgets/navigation_scaffold/components/side_navigation_bar.dart
Add Markdown support for changelog display	Add markdown_widget dependency to pubspec.yaml Use MarkdownWidget to render release notes in the update information UI	pubspec.yaml lib/screens/settings/widgets/settings_update_information.dart

Assessment against linked issues

Issue	Objective	Addressed	Explanation

Possibly linked issues

• 💡 [Desktop] Add option to auto update the app. #154: The PR adds update notification settings and UI elements related to the auto-update feature requested in the issue.
• 💡 [Desktop] Add option to auto update the app. #154: Adds update notification and checks GitHub releases for new versions as requested in the issue.

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[sourcery-ai]

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

• In SettingsUpdateInformation.initState, you’re marking updates as viewed on widget build—consider moving that into a user action (e.g. when they expand or tap the update) so updates aren’t flagged as seen prematurely.
• Enhance UpdateChecker.fetchRecentReleases with proper exception handling, retries and a GitHub‐compatible User-Agent header to avoid silent failures and API rate limits.
• The hasNewUpdateProvider uses defaultTargetPlatform which won’t catch web or custom builds correctly—consider a more robust platform check (e.g. using kIsWeb or explicit desktop flags).

Here's what I looked at during the review

• 🟡 General issues: 4 issues found
• 🟢 Security: all looks good
• 🟢 Review instructions: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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