Feature/digital world clock

[miguelsg29]

This PR introduces a new built-in Digital World Clock widget alongside the existing analog world clock:

• Displays digital time for configured world clock time zones.
• Automatically respects ImmortalSettings.use24HourClock (12-hour vs 24-hour format).
• Responsive design: dynamically adjusts font size and alignment for 1, 2, 3, or 4 active time zones.
• Includes Spanish translations in I18n.kt.

[starbrightlab]

Nice addition — reviewed the two world-clock commits (independent of the i18n base). Correctness is solid: DST-safe (TimeZone.getTimeZone(zone)), respects use24HourClock (AUTO/12/24), and the LaunchedEffect tick actually updates. Integration follows the existing analog-widget pattern at all the right points, DisposableEffect cleans up the observer, no new persisted setting → tripwires stay green. This is close to mergeable.

A few nits before merge:

1. Don't repurpose the Timers glyph. ca7cab9 changed the shipped Timers icon ⏱ → ⌛ purely to free ⏱ for the new clock (HomeActivity.kt:3198). That silently alters an existing widget (and an hourglass suits a timer worse). Please give the digital clock its own glyph and leave Timers as-is.
2. Tick per-minute, not per-second. The digital face shows only HH:mm yet wakes every second (delay(1000)), and remember(zone, now, ...) re-keys on now so it memoizes nothing. On an always-on OLED launcher, per-minute is easier on power/burn-in.
3. Optional: the digital and analog widgets share ~all their scaffolding (state, lifecycle observer, tick, responsive layout) — a shared helper would avoid future double-maintenance. And at 3–4 zones the time Text is maxLines=1 with no overflow = Ellipsis, so a wide "12:45 PM" can clip.

Fix 1 and 2 and I'm happy to merge.