feat: show addon icon from manifest

[matiaspalmac]

Changes

Adds support for an icon field in the addon manifest so marketplace entries can display their own logo instead of the generic Package fallback.

• apps/desktop/src/context/ExtensionContext.tsx: adds optional icon?: string to ExtensionManifest.
• apps/desktop/src/components/MarketplaceView.tsx: adds a small resolveIconUrl() helper that accepts either an absolute URL or a path relative to the addon's repo (resolved against raw.githubusercontent.com using the same owner/branch/path logic as repo_to_raw_base on the Rust side). Adds an AddonIcon component that renders the image and falls back to the existing Package icon when there's no icon or when the image fails to load. Both usages (grid card and details view header) now go through it, with overflow-hidden on the wrappers so the image respects the rounded corners.

Addons can now declare any of:

{ "icon": "assets/logo.png" }
{ "icon": "https://example.com/logo.svg" }

Entries without an icon keep the current visual unchanged.

Issues

• fix Feat: Show Addon icon #15

[Copilot]

Pull request overview

Adds support for showing an addon-provided icon from the addon manifest in the marketplace UI, falling back to the existing generic Package icon when not available or when loading fails.

Changes:

• Extends ExtensionManifest with an optional icon?: string field.
• Introduces resolveIconUrl() + AddonIcon in MarketplaceView to render either a manifest-provided icon (absolute URL or repo-relative path) or a Package fallback.
• Updates both the marketplace grid cards and the details header to use AddonIcon with overflow-hidden wrappers for proper rounding.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

File	Description
apps/desktop/src/context/ExtensionContext.tsx	Adds icon?: string to the manifest type so addon metadata can include an icon path/URL.
apps/desktop/src/components/MarketplaceView.tsx	Resolves icon URLs (absolute or GitHub-raw relative) and renders them with graceful fallback in grid + details views.

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[jmaxdev]

done