Add Date added

[Norphirion]

Date added

Adds an Added card to the stats row on a game's library page, next to Cloud status, Achievements and Size on disk, showing the date the game entered the user's library.

Steam records this date but never surfaces it anywhere in the client. It makes it easy to tell a years-old backlog entry from something picked up in the last sale.

The date is read from rt_purchased_time on Steam's local app overview: no network access, no account linking, no configuration. Class names are resolved at runtime via findClassModule, so the card keeps Steam's own styling rather than hardcoding hashed class names.

Task Checklist

Developer

• I am the original author or an authorized maintainer of this plugin.
• I have complied with all license requirements for the libraries used, including providing appropriate notices where necessary.
• My plugin is fully open source and does not depend on any external paid services, except for widely trusted and well-known platforms. Additionally, neither I nor anyone associated with me profits from any such services.

Plugin Functionality

• I have tested the plugin on both the Stable and Beta Steam update channels.
• My plugin is unique, or provides additional or alternative functionality to plugins already on the store.

Backend Configuration

• No: I use a standard Millennium python backend in my plugin.
• No: I use custom binaries that or rely on other FOSS projects that aren't written directly using Millennium's python backend.

Community Contribution

• I have tested and left feedback on two other plugin pull requests.
• I have added links to those feedback comments in this PR.

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Testing Instructions

• Verified by a third party on Steam Client Stable.
• Verified by a third party on Steam Client Beta.