fix(bolt-slides): distinguish speaker view from present

[geotrev]

Speaker view and Present were easy to mix up. The timer used the same play icon as Present, the dock tooltip said Presenter next to Present, and On screen now sounded like the deck was already live.

• Timer start (idle) uses a stopwatch
• Once the timer has time on it, the control is play/pause
• On screen now is Current slide
• Dock tooltip is Speaker view instead of Presenter

Part of BOU-2738

Test plan

• Studio dock tooltip reads Speaker view (P), not Presenter
• Present tooltip is unchanged
• Speaker view (/?presenter=1) shows Current slide / Up next
• Idle timer shows a stopwatch
• Running timer shows pause; paused timer shows play
• Reset returns the control to the stopwatch

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