1.6.5 - UI fixes & improvements

Fixes

• Empty tab bar segment (#30) — An extra, blank tab with no icon or title could appear next to Library after the app window was resized (Slide Over / Split View / multitasking). The player panel is no longer attached to the tab bar controller, so the tab bar always shows exactly its three tabs.
• Player layout in narrow windows — The progress bar sat right under the transport buttons with a wide gap down to the timestamps; it now sits just above the time labels, which keeps the controls evenly spaced in Slide Over without changing the layout on iPhone or full-screen iPad.
• Playback pausing in multitasking — Dragging the app into Slide Over next to another app made iOS pause video and audio. Playback now resumes automatically after that system pause, while a pause you triggered yourself stays paused.
• Layout warnings — Cleaned up the Auto Layout and collection-view layout warnings logged while the app window was being resized.