[jiunbae]

Two commits:

• fix(renderer): keep the whole-row write for widths the cell delta cannot model. Found while self-reviewing the upstream split of perf(renderer): repaint changed cells, not whole rows, in panes and bordered popups #6. The styled-row cell delta (perf(renderer): repaint changed cells, not whole rows, in panes and bordered popups #6) measured cells with plain unicode-width, while the grid uses rmux-core's width model (emoji override table, ZWJ / flag / skin-tone joining, VS16 widening, Hangul jamo composition, and the codepoint-widths / variation-selector-always-wide options). Both rows were mis-measured alike, so the width check passed and the delta put text in the wrong column — e.g. ☝ ab → ☝ ac replayed as ☝ cb, 👍🏽 ab → 👍🏽 ab c, and a changed flag split into a lone regional indicator. Rows holding any character the two models may disagree on now keep the whole-row write, and pane rows skip the cell delta entirely when the session's width options are not the defaults. Bordered popup records get the character filter only (the popup cache has no option store), so a custom codepoint-widths can still mis-measure there.
• chore: bring over what preparing the upstream PRs added (fix(popup): stop repainting the whole popup on every child write Helvesec/rmux#233, fix(popup): keep status ticks and background output from painting over popups Helvesec/rmux#234, fix(server): reap destroy-unattached sessions when their last client switches away Helvesec/rmux#235): a Rust regression test for switch-client from inside a popup, the unicode-width dependency sorted, and neutral names in a test fixture.

Tests: rmux-server pane_delta / popup_delta / live_render tests (49) pass on Windows 11, including a new test with every failing case from the review; cargo clippy -p rmux-server --all-targets -- -D warnings and cargo fmt --check pass.

🤖 Generated with Claude Code