Create static file source layout for dynamic SideStore icons

[nythepegasus]

As discussed a little bit within the Discord, an idea for an upcoming feature for SideStore 0.6.3 is the concept of dynamic app icons for SideStore. A simple idea for a "schema" layout of a source for these icons would be:

{
  "icons": {
    "Classic": [
      {
        "name": "Original",
        "url": "https://raw.githubusercontent.com/SideStore/assets/refs/heads/main/icon.png"
      }
    ],
    "Modern": [
      {
        "name": "Blue",
        "url": "https://raw.githubusercontent.com/SideStore/assets/refs/heads/main/blue.png"
      }
    ],
    "iOS 26": [
      {
        "name": "New",
        "url": "https://raw.githubusercontent.com/SideStore/assets/refs/heads/ios26/icon.png"
      }
    ]
  }
}

Some example Swift:

// let serverIcons = try? JSONDecoder().decode(ServerIcons.self, from: jsonData)

import Foundation

// MARK: - ServerIcons
struct ServerIcons: Codable {
    // MARK: - Icons
    struct Icons: Codable {
        // MARK: - Icon
        struct Icon: Codable {
            let name: String
            let url: String
        }
        
        let classic, modern, iOS26: [Icon]
        
        enum CodingKeys: String, CodingKey {
            case classic = "Classic"
            case modern = "Modern"
            case iOS26 = "iOS 26"
        }
    }
    let icons: Icons
}

We just need to ensure we agree on how to organize and name these files within this repository.

[nythepegasus]

This does suggest hardcoding bits to have easier decoding (ServerIcons CodingKeys helps ensure type safety), but we could extrapolate to a different structure to allow more separation and better dynamic pulling, e.g.

{
  "sections": [
    {
      "name": "Classic",
      "url": "https://raw.githubusercontent.com/SideStore/assets/refs/heads/main/classic.json"
    },
    {
      "name": "Modern",
      "url": "https://raw.githubusercontent.com/SideStore/assets/refs/heads/main/modern.json"
    }
  ]
}

then inside classic.json e.g.

{
  "icons": [
    {
      "name": "Default",
      "url": "https://raw.githubusercontent.com/SideStore/assets/refs/heads/main/icon.png"
    }
  ]
}

Where we can have the simpler

import Foundation

// MARK: - ServerPath
struct ServerPath: Codable {
    let name: String
    let url: String
}

// MARK: - ServerIconSections
struct ServerIconSections: Codable {
    let sections: [ServerPath]
}

// MARK: - ServerIcons
struct ServerIcons: Codable {
    let icons: [ServerPath]
}
// let serverIconSections = try? JSONDecoder().decode(ServerIconSections.self, from: jsonData)
// let serverIcons = try? JSONDecoder().decode(ServerIcons.self, from: jsonData)

This is fully up to us on how we want to proceed with caching/etc