feat(ui): enhance vessel details in map popups (#1094)

[lspassos1]

This PR improves the data density and visual presentation of vessel information in the map popups.

Key changes:

• Added USNI intelligence metadata (ship class description, role).
• Integrated flag emojis for registry identification.
• Added support for historical tracking trail toggles.
• Improved layout for maritime-specific data points.

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[koala73]

Hey @lspassos1, really solid work on this one! The scope is focused, the USNI intel collapsible section is a nice UX touch, and the flag emoji generation with proper error handling is well done. Great additions with nearChokepoint, nearBase, and tracking history.

A few things to address before merge:

Must fix:

1. Missing i18n keys - New translation keys need to be added to all locale files: popups.militaryVessel.recentTracking, lastReport, nearChokepoint, nearBase, lastSeen. Without these, non-English users see raw key strings.

2. Type definitions - Properties like vessel.track, vessel.operatorCountry, vessel.nearChokepoint, vessel.nearBase, vessel.aisGapMinutes need to exist on the MilitaryVessel type or TypeScript will fail the build.

3. Coordinate hemisphere bug - ${tp[1].toFixed(3)}°N, ${tp[0].toFixed(3)}°E assumes northern/eastern hemisphere. A vessel at Sydney would show -33.856°N. Should use N/S and E/W based on sign.

4. lastAisUpdate null check - new Date(vessel.lastAisUpdate).toLocaleString() shows "Invalid Date" if the field is missing. Needs a guard.

Nice to have:

5. Duplicate cluster vessel rendering - The flag+name mapping for visibleVessels and hiddenVessels is identical. Could extract a small renderClusterVesselItem(v) helper.

6. USNI source link discoverability - The article link moved from the popup footer into the collapsible <details>. Users now have to expand to find the source. Consider keeping a small link outside the fold.

Thanks again, this is a quality contribution!