Re: [w3c/gamepad] Require system focus for gamepad user gesture (PR #207)

@Copilot commented on this pull request.

## Pull request overview

Updates the Gamepad spec’s “gamepad user gesture” handling to require the relevant document to have user attention (i.e., be focused/active) before the initial gesture unlocks exposure of gamepad data, addressing issue #206’s cross-tab gesture concerns.

**Changes:**
- Gate setting `Navigator/[[hasGamepadGesture]]` on the associated document being a fully active descendant of a top-level traversable with user attention.
- Hoist the associated `Document` lookup earlier in the “update gamepad state” algorithm (so it can be used for the new focus/user-attention check).





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> +          |document| is a [=Document/fully active descendant of a top-level
+          traversable with user attention=] and |gamepad| [=contains a gamepad
+          user gesture=]:

The condition uses “|document| is a Document/fully active descendant …” but |document| is defined as Document? and can be `null`. Add an explicit `|document| is not null` (or change the condition to handle `null`) before applying the HTML definition, to avoid a type-mismatched check and make the focus requirement unambiguous.
```suggestion
          |document| is not `null` and is a [=Document/fully active descendant
          of a top-level traversable with user attention=] and |gamepad|
          [=contains a gamepad user gesture=]:
```

> +          <li>Let |gamepads:sequence&lt;Gamepad?&gt;| be an empty [=list=].
+          </li>

This algorithm step is duplicated: `Let |gamepads:sequence<Gamepad?>| be an empty list` appears twice in a row. Remove the extra step to avoid confusion about variable re-declaration and keep the algorithm consistent.
```suggestion

```

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