firmware: clear panel to Loading screen on new stream connection

The panel used to hold its last framebuffer during the connect→first-frame gap,
flashing a stale old frame before video appeared — more visible now that the
Scrypted side no longer sends a bridging snapshot. The wake path already paints
the Loading screen, but state_machine_set(AWAKE) is a no-op when the device is
already awake (e.g. a stream restart), so the clear didn't happen there.

Tie the clear to the stream connection instead: recv-task paints
local_screens_show_loading() once per new conn_id, guarded by the decoder lock
so the RGB565 present can't race a trailing decode-task paint, and gated on
AWAKE so it never draws on a sleeping panel.

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