feat: add time unit selector for warning proceed time window

[binayshaw7777]

Summary

• Warning config's "proceed time window" slider previously only worked in minutes (max 240 min). Users couldn't express durations longer than a few hours.
• Added a unit selector text button with trailing chevron icon (Minutes / Hours / Days) next to the slider. Slider bounds adjust per unit: 1–60 min, 1–24 hr, 1–30 days.
• Existing stored values (in minutes) auto-detect the best unit on load (days → hours → minutes). Saved value is always converted back to minutes, so proceedsTimeWindowMn storage format is unchanged.
• Updated warning_time_window string format to include the unit label; all 7 translation files updated.

Resolves #330

Screenshots

Test plan

• Open warning config for any blocker. Confirm time window shows correct unit for existing saved value
• Switch unit dropdown — verify slider bounds change and title updates
• Save and reopen — confirm value round-trips correctly (e.g. 2 hours saves as 120 mins, reloads as "2 Hours")
• Test edge: value at max of one unit, switch to another unit — slider should clamp to new bounds
• Verify all 7 locales compile without missing string errors

[binayshaw7777]

Can you please review @nethical6 ?

[nethical6]

thanks!