🎨 Palette: Add visual resource icons to UnitPanel cargo inventory

[b0x1]

🎨 Palette: Micro-UX Enhancement

I have enhanced the unit's cargo inventory in the UnitPanel to provide better visual context and a more polished feel.

💡 What

• Added 16px visual resource icons next to each cargo item using the existing ResourceIcon component.
• Improved resource name formatting: transformed internal keys like TRADE_GOODS into user-friendly Trade goods.
• Applied robust layout classes (truncate, gap-2, min-w-0) to ensure the inventory stays clean even with long names or varying amounts.

🎯 Why

• Recognition over Recall: Players can now identify cargo at a glance via icons rather than reading through a text list.
• Visual Consistency: Aligns the unit inventory with the settlement inventory which already uses resource iconography.
• Polish: Small touches like handling underscores in names make the game feel more finished and professional.

📸 Verification

• Successfully ran a Playwright verification script that injected cargo and verified the rendering.
• Visual confirmation via screenshot and video.
• All tests, linting, and type-checking passed.

♿ Accessibility

• Improved visual hierarchy makes the information more accessible to users with cognitive or reading difficulties.
• Maintained semantic structure for screen readers.

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PR created automatically by Jules for task 11040475149839159394 started by @b0x1

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