* fix(app): preserve loader behavior in retained panels
Keep the running footer mounted across panel switches. Inactive loaders stop their animation work, then realign to the original wall-clock phase before they become visible.
* perf(app): remove inactive loader wrapper worklet
* perf(app): pause hidden turn elapsed timers
* perf(app): reduce loader animation work
Keep one wall-clock-aligned clock for visible loaders and detach retained
hidden loaders without unmounting them. Preserve the 950 ms sequence and
reduced-motion behavior.
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