issue-1386: Improved unit translation support for next hour forecast

[geosaaga]

Closes #1386

[Copilot]

Pull request overview

This PR addresses #1386 by ensuring unit abbreviations are translated via the unitAbbreviations i18n namespace (instead of being rendered as raw unit strings) in next-hour and vertical forecast UI components.

Changes:

• Updated multiple forecast components to render units using t(\unitAbbreviations:${unitAbb}`)` (temperature, wind, precipitation).
• Aligned unit rendering across next-hour forecast panels/bars and the vertical 10-day forecast precipitation row.
• Updated i18n mocks in relevant unit tests so unitAbbreviations:* resolves to the unit key (e.g., C) for assertions.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/components/weather/NextHourForecastPanelWithWeatherBackground.tsx	Translate displayed temperature unit abbreviation via unitAbbreviations namespace.
src/components/weather/forecast/Vertical10DaysForecast.tsx	Translate displayed precipitation unit abbreviation in the vertical 10-day list row.
src/components/weather/forecast/NextHourForecastBar.tsx	Translate displayed wind/precipitation/temperature unit abbreviations in the next-hour bar.
src/components/weather/forecast/HourForecast.tsx	Translate displayed temperature unit abbreviation in the hourly forecast item.
__tests__/components/NextHourForecastPanelWithWeatherBackground.test.tsx	Adjust t mock to return unit abbreviations for unitAbbreviations:* keys.
__tests__/components/HourForecast.test.tsx	Adjust t mock to return unit abbreviations for unitAbbreviations:* keys.

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