Fix TS1117 duplicate background property in FineTune JobCard

[Copilot]

The JobCard component's inline style object contained two background declarations in the same object literal, causing TypeScript error TS1117: An object literal cannot have multiple properties with the same name.

Change

Removed the redundant static background: "var(--surface)" property, retaining only the conditional one that correctly handles the selected state:

// Before (broken)
<div onClick={onSelect} style={{
  background: "var(--surface)",   // ← duplicate (first)
  border: "1px solid var(--border)",
  ...
  background: selected ? "rgba(88,166,212,0.05)" : "var(--surface)",  // ← TS1117 here
}}>

// After (fixed)
<div onClick={onSelect} style={{
  background: selected ? "rgba(88,166,212,0.05)" : "var(--surface)",  // ← single property
  border: "1px solid var(--border)",
  ...
  borderRadius: "var(--radius)"
}}>

The conditional already covers the default ("var(--surface)") case, so no visual behavior changes.

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