fix(selection): preserve live previews for multi-row drag selection

[ghiscoding]

Summary

Fix duplicate ranges and missing live decorators when using Ctrl/Cmd multi-row drag selection.

Why

Intermediate drag events were being accumulated as separate ranges. Preventing that accumulation also removed the live selection preview.

Changes

• Preserve the original selection ranges during modifier drags.
• Replace the temporary preview range as the pointer moves.
• Commit only the final range on mouseup.
• Added regression coverage for multi-section row selection.

Validation

• 4,374 common tests passed
• TypeScript build passed
• Oxlint passed
• Prettier passed
• Scoped coverage: 100% statements, functions, and lines

Comments

Cypress was not run.

AI / LLM assistance

• AI / LLM assistance used:
  • No
  • Yes
• If Yes:
  • which tool/model: Codex / GPT-5.6 Luna
  • how was it used: Investigated the selection lifecycle, implemented the fix, added regression coverage, and ran validation checks.

Checklist

• The changes are limited to only one scope.
• Tests were added or updated where appropriate.
• Documentation was updated where appropriate.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.0%. Comparing base (77f0ded) to head (6799625).
⚠️ Report is 7 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2777   +/-   ##
=======================================
  Coverage   100.0%   100.0%           
=======================================
  Files         199      199           
  Lines       25763    25773   +10     
  Branches     9128     9131    +3     
=======================================
+ Hits        25763    25773   +10     

Flag	Coverage Δ
angular	100.0% <ø> (ø)
universal	100.0% <100.0%> (ø)

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commit: 6799625