handle all battery states provided by the kernel

[neoden]

• Handle all Linux battery statuses (Charging, Discharging, Full, Not charging, Unknown)
• Hide temperature widget until EMA is warmed up

[Copilot]

Pull request overview

Updates widget behavior to better reflect Linux kernel-reported battery states and to avoid showing temperature output until EMA smoothing has enough samples.

Changes:

• Replace IsCharging with a BatteryState enum and parse /sys/class/power_supply/*/status into it.
• Adjust battery hide/show logic to use “on AC” vs “not on AC” semantics derived from BatteryState.
• Hide temperature widget output until the EMA is “ready” (warmed up), updating tests accordingly.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 4 comments.

File	Description
widgets/temperature.go	Gate temperature display on EMA readiness to avoid early/noisy readings.
widgets/temperature_test.go	Prime/initialize EMA in tests so temperature GetBlock tests remain meaningful with readiness gating.
widgets/battery.go	Introduce BatteryState, parse kernel status strings, and update hide/charging logic to use state.
widgets/battery_test.go	Update tests to assert on BatteryState and expand hide-logic coverage for additional states.

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