live: fix double-click fullscreen — return to grid in mode 1, solo-only in mode 2
Track whether fullscreen was entered by the double-click itself (_fsBySolo). Mode 1 (from the grid): a double-click fullscreens the camera and a second double-click now exits fullscreen back to live view. Mode 2 (already in fullscreen via F): double-click toggles solo/grid without leaving fullscreen; Esc or F exits. Exiting fullscreen by any means resets the flag and clears solo. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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