fix(core): preserve resolved vertical merge cell shapes

[jan-kubica]

• Share the reader's vertical-merge projection with targeted and bulk revision resolution.
• Keep content-bearing continuations and continuation-only rows visible, preserving their saved merge state.
• Check resolution against the reader and repeated save/reopen cycles.

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[codspeed]

Merging this PR will not alter performance

✅ 17 untouched benchmarks
⏩ 6 skipped benchmarks¹

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_{Comparing fix/vertical-merge-resolution-shape (5415fbb) with fix-tracked-table-paste-spans (e2a80cd)}

Footnotes

1. 6 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

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