Fix intermittent overlay auto-hide

[Perecli]

Bug

runAction() calls showController() for every tracked media element. showController() stored its timeout in one page-global timer, so showing a later controller cleared the pending timeout for an earlier controller. On pages with multiple media elements, the visible overlay could therefore retain the vcs-show class indefinitely and remain onscreen until the user pressed V.

Fix

Store the timeout on the controller element itself (controller.showTimeOut). Re-showing a controller now resets only its own timeout, while showing another controller cannot cancel it.

The existing two-second delay and all shortcut, speed, positioning, and visibility behavior remain unchanged.

Validation

• node --check inject.js
• Local regression harness covering two controllers and same-controller timer refresh
• git diff --check