Add TINYCARE_REFRESH_INTERVAL environment variable to control refresh timing

[Copilot]

The refresh interval was hardcoded to 300 seconds. This adds TINYCARE_REFRESH_INTERVAL to make it configurable.

Changes

• New GetRefreshInterval() function: Reads TINYCARE_REFRESH_INTERVAL env var, parses as seconds, validates positive integer, defaults to 300
• Updated refresh goroutine: Replaced hardcoded 300 * time.Second with GetRefreshInterval() call
• Documentation: Added env var to README configuration section
• Tests: Added unit tests covering default, valid, and invalid input cases

Usage

# Default 5 minutes
tinycare-tui

# Custom 60 seconds
TINYCARE_REFRESH_INTERVAL=60 tinycare-tui

# Invalid values fall back to default
TINYCARE_REFRESH_INTERVAL=0 tinycare-tui        # Uses 300s
TINYCARE_REFRESH_INTERVAL=invalid tinycare-tui  # Uses 300s

Original prompt

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This section details on the original issue you should resolve

<issue_title>Control refresh timer with environment variable </issue_title>
<issue_description># Problem
Currently the views are setup to refresh every 30 seconds. This 30 second time frame is hard coded. We would like to control this via an environment variable named TINYCARE_REFRESH_INTERVAL.

Solution

Update this line to use the environment variable instead of a hardcoded value

https://github.com/DMcP89/tinycare-tui/blob/main/cmd%2Ftinycare-tui%2Fmain.go#L130</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Control refresh timer with environment variable  #14

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