feat(battery): support profile-based charge limit UI messages

[JoJoStax]

Objective

The battery dropdown currently assumes charge limits are strictly percentage-based numeric thresholds. However, certain laptops (like Lenovo IdeaPads and other brands) use sysfs profile-based charge limits (e.g., Long_Life vs Standard), which UPower abstracts. When these profile-based limits are active, the backend returns a threshold of 0, causing the UI to confusingly display "Limit to 0%".

• Fixes Charge-Limit Fallback to charge-types when numerical values aren't available. #296

Backend Context: This PR depends on wayle-services#38, which implements the fallback mechanism to detect and handle profile-based limits.

Solution

Updated BatterySection to handle 0 percentage limits as profile-based optimized limits rather than literal zero percent:

• Added localization keys for English and French: dropdown-battery-charge-limit-optimized and dropdown-battery-charge-limit-optimized-subtitle
• Updated wayle-shell/src/shell/bar/dropdowns/battery/battery_section/mod.rs to detect when model.charge_end_threshold == 0
• Displays "Optimized Battery Health" with subtitle "Prolongs lifespan by limiting full charges" instead of "Limit to 0%"
• Numeric percentage limits (e.g., 80) continue to display normally

Test Plan

• Tested locally on a Lenovo laptop using charge_types (profile-based limits)
• Verified UI displays the new localized strings when charge threshold is 0
• Verified traditional numeric percentage limits still display correctly