[Feature] Count Up (stopwatch) mode with earned break ratio and reminders

[Mustache-Games]

The problem

Reef currently supports "Timer" (countdown) and "Pomodoro" modes, but lacks a flexible option for free-form focus sessions. Users who prefer unstructured work periods—where the goal is simply to stay focused as long as possible without a rigid time limit—have no way to track their progress or manage breaks dynamically. Existing countdown-based modes force users to decide session length upfront, which can be counterproductive when deep focus leads to naturally longer work periods.

Suggested solution

Implement a "Count Up" mode inspired by Goodtime. This mode functions as a stopwatch that accumulates "break budget" over time based on a user-configurable focus-to-break ratio.

Core mechanics:

• Count Up Timer: Tracks focused work time continuously without a predetermined limit.
• Break Budget: As the user focuses, they earn break time proportionally. For example, with a 5:1 ratio, every 5 minutes of focus earns 1 minute of break.
• Configurable Ratios: Users can set custom ratios (e.g., 5:1 for traditional pomodoro feel, 4:1 for longer breaks, 3:1 for generous recovery, or 6:1 for minimal breaks).
• Visual Indicator: Display current break budget accumulation in real-time (e.g., "25m focus = 5m break earned").
• Break Enforcement: When the user stops the timer, they can choose to take their earned break (switching to a countdown) or bank it for later.
• Break Reminders: Optional notifications that prompt users to take a break after a configurable duration of continuous focus or at set intervals (e.g., every 25 minutes), helping maintain healthy work rhythms without interrupting the count-up session.

Workarounds

1. Use the existing "Timer" mode with arbitrarily long durations and manually calculate break time.
2. Use external stopwatch apps alongside Reef, breaking the integrated workflow.