Add Hour Notifications Plugin

[mpcallahan]

Add Hour Notifications to Plugin Store

Hour Notifications displays a small toast notification at the top of every hour while playing games on Steam Deck. The toast shows the current hour (12-hour format, no AM/PM) and is intended as a lightweight time awareness aid without being intrusive.

Unlike timers or alarms, this plugin requires no configuration, does not track playtime, and runs passively in the background. It is designed to be minimal, low-overhead, and predictable, emitting exactly once per hour aligned to the system clock.

The plugin uses the standard Decky Python backend and React frontend, with no custom binaries or external dependencies.

Task Checklist

Developer

• I am the original author or an authorized maintainer of this plugin.
• I have abided by the licenses of the libraries I am utilizing, including attaching license notices where appropriate.

Plugin

• I have verified that my plugin works properly on the Stable and Beta update channels of SteamOS.
• I have verified my plugin is unique or provides more/alternative functionality to a plugin already on the store.

Backend

• No: I am using a custom backend other than Python.
• No: I am using a tool or software from a 3rd party FOSS project that does not have it's dependencies statically linked.
• No: I am using a custom binary that has all of it's dependencies statically linked.

Community

• I have tested and left feedback on two other pull requests for new or updating plugins.
• I have commented links to my testing report in this PR.

Testing

• Tested by a third party on SteamOS Stable or Beta update channel.

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[EMERALD0874]

Have you considered making a PR to one of the other clock-based Decky plugins? Alar.me is aiming to be a comprehensive alarm and timer plugin and would likely benefit from having this feature added rather than kept separate.