positions each opened update at its newest loaded activity exactly once
preserves user scroll during loading and offers an explicit jump control
rejects stale/prefetched positioning and precaches the behavior for installed mobile use
Verification
RED: 4 focused tests failed before implementation
focused: 258 passed
full: 1454 passed
Closes #759
## Product slice
- positions each opened update at its newest loaded activity exactly once
- preserves user scroll during loading and offers an explicit jump control
- rejects stale/prefetched positioning and precaches the behavior for installed mobile use
## Verification
- RED: 4 focused tests failed before implementation
- focused: 258 passed
- full: 1454 passed
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Closes #759
Product slice
Verification