feat(config): add autowrap setting; drop always-on full-repaint workaround

[hyldmo]

Supersedes the approach in #114 (merged).

Context

#114 forced a full repaint every frame to fix the render-drift smear (right-pane output bleeding into the tab sidebar; scrollbar dropping). That works, but it has a per-frame stdout cost. The cheaper alternative — disabling the terminal's autowrap — can't be on by default either: for non-grid output it risks long lines running off-screen, and it changes a global terminal mode. Neither belongs on by default.

What this does

• Removes App.forceFullRepaints() (the fix(ui): force full repaint at runtime instead of via bun patch #114 every-frame full repaint).
• Adds an opt-in autowrap config (default true = unchanged). Set autowrap: false and numux disables the host terminal's autowrap (DECAWM, \x1b[?7l) on startup, restoring it (?7h) on exit.

export default defineConfig({
  autowrap: false, // disable host autowrap if you hit the sidebar smear
  processes: { /* … */ }
})

Pane content still wraps inside its own VT grid — only the host emit-cursor wrap (which OpenTUI never relies on) is turned off.

Behavior change ⚠️

By default this removes the always-on smear fix #114 added. Out of the box the smear can recur (resize clears it, as before); users who hit it opt in with autowrap: false. This is the deliberate "make it a setting for now" stance until the renderer is fixed upstream.

Root cause / upstream

OpenTUI's incremental diff positions every run with an absolute cursor move and never relies on autowrap, but it never disables it and skips its right-edge cursor re-home to avoid tripping a wrap — so a run filling the last column wraps into column 1 of the next row, and syncCell records the intended cell so the stray bytes never repaint until a full repaint. Tracked upstream (with the same ?7l fix proposed): anomalyco/opentui#1187.

Testing

• bun test — 702 pass, 0 fail (3 new validator cases). typecheck / lint clean.
• Verified live in a downstream repo: autowrap: false eliminates the smear; shell wrapping restored on exit.

🤖 Generated with Claude Code

[github-actions]

🎉 This PR is included in version 2.18.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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