Every live tool block (streaming args, a running partial tool, or a task
subagent) armed its own 80ms setInterval driving requestComponentRender,
so N concurrent live blocks created N unsynchronized repaint timers that
kept the 30fps render scheduler awake near-continuously during
multi-subagent / workflowz / orchestrate work.
Replaced the per-component intervals with a single shared spinner ticker
that advances the already-phase-locked glyph once per step and repaints
every registered live block in one coalesced frame, independent of block
count. Verified 3 live blocks now share 1 timer instead of 3.
Fixes#8731
roboomp
49f22987d5