Bug: updateSourceCaches_() assumes srcObj has src and type properties

## Bug: `updateSourceCaches_()` assumes `srcObj` has `src` and `type` properties

**Severity:** Low  
**Files:** `src/js/player.js`  
**Lines:** 1582-1585

### Description
When `srcObj` is a non-string object, the code accesses `srcObj.src` and `srcObj.type` without checking if these properties exist. If `srcObj` is `null`, `{}`, or an object with different keys, `src` and `type` will be `undefined`, leading to silent failures.

### Affected code
```javascript
if (typeof src !== 'string') {
  src = srcObj.src;   // <-- Could be undefined
  type = srcObj.type; // <-- Could be undefined
}
```

### Suggested fix
```javascript
if (typeof src !== 'string') {
  src = srcObj?.src ?? '';
  type = srcObj?.type ?? '';
}
```

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Bug: updateSourceCaches_() assumes srcObj has src and type properties #9185