fix: recompute group LOC estimates after an interactive hunk move

[vitali87]

Summary

The interactive editor's move <file>:<hunk> <from> <to> updated the assignments but left each group's estimated_loc / estimated_added / estimated_removed untouched. The post-edit validate_plan then used the stale numbers: false "above maximum" LOC-bound warnings (or a wrong --strict-loc-bounds failure) for the source group, and wrong +N/-M stats in the PR bodies and in the editor's own plan table.

_interactive_edit now calls the existing recompute_estimated_loc(groups, parsed_diff) after every successful move.

Test plan

• TestInteractiveEditRecomputesLoc drives the editor with a real two-hunk diff: after move a.py:1 pr-1 pr-2 the groups report +1/-0 and +2/-0 (fails on main with loc=3), and a failed move leaves the estimates alone
• 446 tests pass, ruff clean
• Local review: 5/5

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Reviewing files that changed from the base of the PR and between 9482d92 and 63f909b.

📒 Files selected for processing (2)

• pr_split/cli.py
• tests/test_cli_coverage.py

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[vitali87]

Closing as a duplicate: this was re-found by a bug hunt run against main, but #60 (recompute after move) and #58 (WHOLE_FILE expansion via covered_indices) already fix it. The non-duplicate follow-ups (#114, #129) have been restacked onto #60.