diff --git a/packages/pi-tui/src/utils.ts b/packages/pi-tui/src/utils.ts
index 228b2420c..430710aed 100644
--- a/packages/pi-tui/src/utils.ts
+++ b/packages/pi-tui/src/utils.ts
@@ -1,4 +1,11 @@
-import { eastAsianWidth } from "get-east-asian-width";
+import {
+	visibleWidth as nativeVisibleWidth,
+	wrapTextWithAnsi as nativeWrapTextWithAnsi,
+	truncateToWidth as nativeTruncateToWidth,
+	sliceWithWidth as nativeSliceWithWidth,
+	extractSegments as nativeExtractSegments,
+	EllipsisKind,
+} from "@gsd/native/text";
 
 // Grapheme segmenter (shared instance)
 const segmenter = new Intl.Segmenter(undefined, { granularity: "grapheme" });
@@ -10,144 +17,20 @@ export function getSegmenter(): Intl.Segmenter {
 	return segmenter;
 }
 
-/**
- * Check if a grapheme cluster (after segmentation) could possibly be an RGI emoji.
- * This is a fast heuristic to avoid the expensive rgiEmojiRegex test.
- * The tested Unicode blocks are deliberately broad to account for future
- * Unicode additions.
- */
-function couldBeEmoji(segment: string): boolean {
-	const cp = segment.codePointAt(0)!;
-	return (
-		(cp >= 0x1f000 && cp <= 0x1fbff) || // Emoji and Pictograph
-		(cp >= 0x2300 && cp <= 0x23ff) || // Misc technical
-		(cp >= 0x2600 && cp <= 0x27bf) || // Misc symbols, dingbats
-		(cp >= 0x2b50 && cp <= 0x2b55) || // Specific stars/circles
-		segment.includes("\uFE0F") || // Contains VS16 (emoji presentation selector)
-		segment.length > 2 // Multi-codepoint sequences (ZWJ, skin tones, etc.)
-	);
-}
-
-// Regexes for character classification (same as string-width library)
-const zeroWidthRegex = /^(?:\p{Default_Ignorable_Code_Point}|\p{Control}|\p{Mark}|\p{Surrogate})+$/v;
-const leadingNonPrintingRegex = /^[\p{Default_Ignorable_Code_Point}\p{Control}\p{Format}\p{Mark}\p{Surrogate}]+/v;
-const rgiEmojiRegex = /^\p{RGI_Emoji}$/v;
-
-// Cache for non-ASCII strings
-const WIDTH_CACHE_SIZE = 512;
-const widthCache = new Map<string, number>();
+const PUNCTUATION_REGEX = /[(){}[\]<>.,;:'"!?+\-=*/\\|&%^$#@~`]/;
 
 /**
- * Calculate the terminal width of a single grapheme cluster.
- * Based on code from the string-width library, but includes a possible-emoji
- * check to avoid running the RGI_Emoji regex unnecessarily.
+ * Check if a character is whitespace.
  */
-function graphemeWidth(segment: string): number {
-	// Zero-width clusters
-	if (zeroWidthRegex.test(segment)) {
-		return 0;
-	}
-
-	// Emoji check with pre-filter
-	if (couldBeEmoji(segment) && rgiEmojiRegex.test(segment)) {
-		return 2;
-	}
-
-	// Get base visible codepoint
-	const base = segment.replace(leadingNonPrintingRegex, "");
-	const cp = base.codePointAt(0);
-	if (cp === undefined) {
-		return 0;
-	}
-
-	// Regional indicator symbols (U+1F1E6..U+1F1FF) are often rendered as
-	// full-width emoji in terminals, even when isolated during streaming.
-	// Keep width conservative (2) to avoid terminal auto-wrap drift artifacts.
-	if (cp >= 0x1f1e6 && cp <= 0x1f1ff) {
-		return 2;
-	}
-
-	let width = eastAsianWidth(cp);
-
-	// Trailing halfwidth/fullwidth forms
-	if (segment.length > 1) {
-		for (const char of segment.slice(1)) {
-			const c = char.codePointAt(0)!;
-			if (c >= 0xff00 && c <= 0xffef) {
-				width += eastAsianWidth(c);
-			}
-		}
-	}
-
-	return width;
+export function isWhitespaceChar(char: string): boolean {
+	return /\s/.test(char);
 }
 
 /**
- * Calculate the visible width of a string in terminal columns.
+ * Check if a character is punctuation.
  */
-export function visibleWidth(str: string): number {
-	if (str.length === 0) {
-		return 0;
-	}
-
-	// Fast path: pure ASCII printable
-	let isPureAscii = true;
-	for (let i = 0; i < str.length; i++) {
-		const code = str.charCodeAt(i);
-		if (code < 0x20 || code > 0x7e) {
-			isPureAscii = false;
-			break;
-		}
-	}
-	if (isPureAscii) {
-		return str.length;
-	}
-
-	// Check cache
-	const cached = widthCache.get(str);
-	if (cached !== undefined) {
-		return cached;
-	}
-
-	// Normalize: tabs to 3 spaces, strip ANSI escape codes
-	let clean = str;
-	if (str.includes("\t")) {
-		clean = clean.replace(/\t/g, "   ");
-	}
-	if (clean.includes("\x1b")) {
-		// Strip supported ANSI/OSC/APC escape sequences in one pass.
-		// This covers CSI styling/cursor codes, OSC hyperlinks and prompt markers,
-		// and APC sequences like CURSOR_MARKER.
-		let stripped = "";
-		let i = 0;
-		while (i < clean.length) {
-			const ansi = extractAnsiCode(clean, i);
-			if (ansi) {
-				i += ansi.length;
-				continue;
-			}
-			stripped += clean[i];
-			i++;
-		}
-		clean = stripped;
-	}
-
-	// Calculate width
-	let width = 0;
-	for (const { segment } of segmenter.segment(clean)) {
-		width += graphemeWidth(segment);
-	}
-
-	// Cache result
-	if (widthCache.size >= WIDTH_CACHE_SIZE) {
-		const firstKey = widthCache.keys().next().value;
-		if (firstKey !== undefined) {
-			widthCache.delete(firstKey);
-		}
-	}
-	widthCache.set(str, width);
-
-	return width;
+export function isPunctuationChar(char: string): boolean {
+	return PUNCTUATION_REGEX.test(char);
 }
 
 /**
@@ -193,495 +76,45 @@ export function extractAnsiCode(str: string, pos: number): { code: string; lengt
 	return null;
 }
 
-/**
- * Track active ANSI SGR codes to preserve styling across line breaks.
- */
-class AnsiCodeTracker {
-	// Track individual attributes separately so we can reset them specifically
-	private bold = false;
-	private dim = false;
-	private italic = false;
-	private underline = false;
-	private blink = false;
-	private inverse = false;
-	private hidden = false;
-	private strikethrough = false;
-	private fgColor: string | null = null; // Stores the full code like "31" or "38;5;240"
-	private bgColor: string | null = null; // Stores the full code like "41" or "48;5;240"
-
-	process(ansiCode: string): void {
-		if (!ansiCode.endsWith("m")) {
-			return;
-		}
-
-		// Extract the parameters between \x1b[ and m
-		const match = ansiCode.match(/\x1b\[([\d;]*)m/);
-		if (!match) return;
-
-		const params = match[1];
-		if (params === "" || params === "0") {
-			// Full reset
-			this.reset();
-			return;
-		}
-
-		// Parse parameters (can be semicolon-separated)
-		const parts = params.split(";");
-		let i = 0;
-		while (i < parts.length) {
-			const code = Number.parseInt(parts[i], 10);
-
-			// Handle 256-color and RGB codes which consume multiple parameters
-			if (code === 38 || code === 48) {
-				// 38;5;N (256 color fg) or 38;2;R;G;B (RGB fg)
-				// 48;5;N (256 color bg) or 48;2;R;G;B (RGB bg)
-				if (parts[i + 1] === "5" && parts[i + 2] !== undefined) {
-					// 256 color: 38;5;N or 48;5;N
-					const colorCode = `${parts[i]};${parts[i + 1]};${parts[i + 2]}`;
-					if (code === 38) {
-						this.fgColor = colorCode;
-					} else {
-						this.bgColor = colorCode;
-					}
-					i += 3;
-					continue;
-				} else if (parts[i + 1] === "2" && parts[i + 4] !== undefined) {
-					// RGB color: 38;2;R;G;B or 48;2;R;G;B
-					const colorCode = `${parts[i]};${parts[i + 1]};${parts[i + 2]};${parts[i + 3]};${parts[i + 4]}`;
-					if (code === 38) {
-						this.fgColor = colorCode;
-					} else {
-						this.bgColor = colorCode;
-					}
-					i += 5;
-					continue;
-				}
-			}
-
-			// Standard SGR codes
-			switch (code) {
-				case 0:
-					this.reset();
-					break;
-				case 1:
-					this.bold = true;
-					break;
-				case 2:
-					this.dim = true;
-					break;
-				case 3:
-					this.italic = true;
-					break;
-				case 4:
-					this.underline = true;
-					break;
-				case 5:
-					this.blink = true;
-					break;
-				case 7:
-					this.inverse = true;
-					break;
-				case 8:
-					this.hidden = true;
-					break;
-				case 9:
-					this.strikethrough = true;
-					break;
-				case 21:
-					this.bold = false;
-					break; // Some terminals
-				case 22:
-					this.bold = false;
-					this.dim = false;
-					break;
-				case 23:
-					this.italic = false;
-					break;
-				case 24:
-					this.underline = false;
-					break;
-				case 25:
-					this.blink = false;
-					break;
-				case 27:
-					this.inverse = false;
-					break;
-				case 28:
-					this.hidden = false;
-					break;
-				case 29:
-					this.strikethrough = false;
-					break;
-				case 39:
-					this.fgColor = null;
-					break; // Default fg
-				case 49:
-					this.bgColor = null;
-					break; // Default bg
-				default:
-					// Standard foreground colors 30-37, 90-97
-					if ((code >= 30 && code <= 37) || (code >= 90 && code <= 97)) {
-						this.fgColor = String(code);
-					}
-					// Standard background colors 40-47, 100-107
-					else if ((code >= 40 && code <= 47) || (code >= 100 && code <= 107)) {
-						this.bgColor = String(code);
-					}
-					break;
-			}
-			i++;
-		}
-	}
-
-	private reset(): void {
-		this.bold = false;
-		this.dim = false;
-		this.italic = false;
-		this.underline = false;
-		this.blink = false;
-		this.inverse = false;
-		this.hidden = false;
-		this.strikethrough = false;
-		this.fgColor = null;
-		this.bgColor = null;
-	}
-
-	/** Clear all state for reuse. */
-	clear(): void {
-		this.reset();
-	}
-
-	getActiveCodes(): string {
-		const codes: string[] = [];
-		if (this.bold) codes.push("1");
-		if (this.dim) codes.push("2");
-		if (this.italic) codes.push("3");
-		if (this.underline) codes.push("4");
-		if (this.blink) codes.push("5");
-		if (this.inverse) codes.push("7");
-		if (this.hidden) codes.push("8");
-		if (this.strikethrough) codes.push("9");
-		if (this.fgColor) codes.push(this.fgColor);
-		if (this.bgColor) codes.push(this.bgColor);
-
-		if (codes.length === 0) return "";
-		return `\x1b[${codes.join(";")}m`;
-	}
-
-	hasActiveCodes(): boolean {
-		return (
-			this.bold ||
-			this.dim ||
-			this.italic ||
-			this.underline ||
-			this.blink ||
-			this.inverse ||
-			this.hidden ||
-			this.strikethrough ||
-			this.fgColor !== null ||
-			this.bgColor !== null
-		);
-	}
-
-	/**
-	 * Get reset codes for attributes that need to be turned off at line end,
-	 * specifically underline which bleeds into padding.
-	 * Returns empty string if no problematic attributes are active.
-	 */
-	getLineEndReset(): string {
-		// Only underline causes visual bleeding into padding
-		// Other attributes like colors don't visually bleed to padding
-		if (this.underline) {
-			return "\x1b[24m"; // Underline off only
-		}
-		return "";
-	}
-}
-
-function updateTrackerFromText(text: string, tracker: AnsiCodeTracker): void {
-	let i = 0;
-	while (i < text.length) {
-		const ansiResult = extractAnsiCode(text, i);
-		if (ansiResult) {
-			tracker.process(ansiResult.code);
-			i += ansiResult.length;
-		} else {
-			i++;
-		}
-	}
-}
+// ---------------------------------------------------------------------------
+// Native text module wrappers
+// ---------------------------------------------------------------------------
 
 /**
- * Split text into words while keeping ANSI codes attached.
+ * Calculate the visible width of a string in terminal columns.
+ * Delegates to the native Rust implementation.
  */
-function splitIntoTokensWithAnsi(text: string): string[] {
-	const tokens: string[] = [];
-	let current = "";
-	let pendingAnsi = ""; // ANSI codes waiting to be attached to next visible content
-	let inWhitespace = false;
-	let i = 0;
-
-	while (i < text.length) {
-		const ansiResult = extractAnsiCode(text, i);
-		if (ansiResult) {
-			// Hold ANSI codes separately - they'll be attached to the next visible char
-			pendingAnsi += ansiResult.code;
-			i += ansiResult.length;
-			continue;
-		}
-
-		const char = text[i];
-		const charIsSpace = char === " ";
-
-		if (charIsSpace !== inWhitespace && current) {
-			// Switching between whitespace and non-whitespace, push current token
-			tokens.push(current);
-			current = "";
-		}
-
-		// Attach any pending ANSI codes to this visible character
-		if (pendingAnsi) {
-			current += pendingAnsi;
-			pendingAnsi = "";
-		}
-
-		inWhitespace = charIsSpace;
-		current += char;
-		i++;
-	}
-
-	// Handle any remaining pending ANSI codes (attach to last token)
-	if (pendingAnsi) {
-		current += pendingAnsi;
-	}
-
-	if (current) {
-		tokens.push(current);
-	}
-
-	return tokens;
+export function visibleWidth(str: string): number {
+	return nativeVisibleWidth(str);
 }
 
 /**
  * Wrap text with ANSI codes preserved.
- *
- * ONLY does word wrapping - NO padding, NO background colors.
- * Returns lines where each line is <= width visible chars.
- * Active ANSI codes are preserved across line breaks.
+ * Delegates to the native Rust implementation.
  *
  * @param text - Text to wrap (may contain ANSI codes and newlines)
  * @param width - Maximum visible width per line
  * @returns Array of wrapped lines (NOT padded to width)
  */
 export function wrapTextWithAnsi(text: string, width: number): string[] {
-	if (!text) {
-		return [""];
-	}
-
-	// Handle newlines by processing each line separately
-	// Track ANSI state across lines so styles carry over after literal newlines
-	const inputLines = text.split("\n");
-	const result: string[] = [];
-	const tracker = new AnsiCodeTracker();
-
-	for (const inputLine of inputLines) {
-		// Prepend active ANSI codes from previous lines (except for first line)
-		const prefix = result.length > 0 ? tracker.getActiveCodes() : "";
-		result.push(...wrapSingleLine(prefix + inputLine, width));
-		// Update tracker with codes from this line for next iteration
-		updateTrackerFromText(inputLine, tracker);
-	}
-
-	return result.length > 0 ? result : [""];
-}
-
-function wrapSingleLine(line: string, width: number): string[] {
-	if (!line) {
-		return [""];
-	}
-
-	const visibleLength = visibleWidth(line);
-	if (visibleLength <= width) {
-		return [line];
-	}
-
-	const wrapped: string[] = [];
-	const tracker = new AnsiCodeTracker();
-	const tokens = splitIntoTokensWithAnsi(line);
-
-	let currentLine = "";
-	let currentVisibleLength = 0;
-
-	for (const token of tokens) {
-		const tokenVisibleLength = visibleWidth(token);
-		const isWhitespace = token.trim() === "";
-
-		// Token itself is too long - break it character by character
-		if (tokenVisibleLength > width && !isWhitespace) {
-			if (currentLine) {
-				// Add specific reset for underline only (preserves background)
-				const lineEndReset = tracker.getLineEndReset();
-				if (lineEndReset) {
-					currentLine += lineEndReset;
-				}
-				wrapped.push(currentLine);
-				currentLine = "";
-				currentVisibleLength = 0;
-			}
-
-			// Break long token - breakLongWord handles its own resets
-			const broken = breakLongWord(token, width, tracker);
-			wrapped.push(...broken.slice(0, -1));
-			currentLine = broken[broken.length - 1];
-			currentVisibleLength = visibleWidth(currentLine);
-			continue;
-		}
-
-		// Check if adding this token would exceed width
-		const totalNeeded = currentVisibleLength + tokenVisibleLength;
-
-		if (totalNeeded > width && currentVisibleLength > 0) {
-			// Trim trailing whitespace, then add underline reset (not full reset, to preserve background)
-			let lineToWrap = currentLine.trimEnd();
-			const lineEndReset = tracker.getLineEndReset();
-			if (lineEndReset) {
-				lineToWrap += lineEndReset;
-			}
-			wrapped.push(lineToWrap);
-			if (isWhitespace) {
-				// Don't start new line with whitespace
-				currentLine = tracker.getActiveCodes();
-				currentVisibleLength = 0;
-			} else {
-				currentLine = tracker.getActiveCodes() + token;
-				currentVisibleLength = tokenVisibleLength;
-			}
-		} else {
-			// Add to current line
-			currentLine += token;
-			currentVisibleLength += tokenVisibleLength;
-		}
-
-		updateTrackerFromText(token, tracker);
-	}
-
-	if (currentLine) {
-		// No reset at end of final line - let caller handle it
-		wrapped.push(currentLine);
-	}
-
-	// Trailing whitespace can cause lines to exceed the requested width
-	return wrapped.length > 0 ? wrapped.map((line) => line.trimEnd()) : [""];
-}
-
-const PUNCTUATION_REGEX = /[(){}[\]<>.,;:'"!?+\-=*/\\|&%^$#@~`]/;
-
-/**
- * Check if a character is whitespace.
- */
-export function isWhitespaceChar(char: string): boolean {
-	return /\s/.test(char);
+	return nativeWrapTextWithAnsi(text, width);
 }
 
 /**
- * Check if a character is punctuation.
+ * Map an ellipsis string to the native EllipsisKind enum value.
  */
-export function isPunctuationChar(char: string): boolean {
-	return PUNCTUATION_REGEX.test(char);
-}
-
-function breakLongWord(word: string, width: number, tracker: AnsiCodeTracker): string[] {
-	const lines: string[] = [];
-	let currentLine = tracker.getActiveCodes();
-	let currentWidth = 0;
-
-	// First, separate ANSI codes from visible content
-	// We need to handle ANSI codes specially since they're not graphemes
-	let i = 0;
-	const segments: Array<{ type: "ansi" | "grapheme"; value: string }> = [];
-
-	while (i < word.length) {
-		const ansiResult = extractAnsiCode(word, i);
-		if (ansiResult) {
-			segments.push({ type: "ansi", value: ansiResult.code });
-			i += ansiResult.length;
-		} else {
-			// Find the next ANSI code or end of string
-			let end = i;
-			while (end < word.length) {
-				const nextAnsi = extractAnsiCode(word, end);
-				if (nextAnsi) break;
-				end++;
-			}
-			// Segment this non-ANSI portion into graphemes
-			const textPortion = word.slice(i, end);
-			for (const seg of segmenter.segment(textPortion)) {
-				segments.push({ type: "grapheme", value: seg.segment });
-			}
-			i = end;
-		}
-	}
-
-	// Now process segments
-	for (const seg of segments) {
-		if (seg.type === "ansi") {
-			currentLine += seg.value;
-			tracker.process(seg.value);
-			continue;
-		}
-
-		const grapheme = seg.value;
-		// Skip empty graphemes to avoid issues with string-width calculation
-		if (!grapheme) continue;
-
-		const graphemeWidth = visibleWidth(grapheme);
-
-		if (currentWidth + graphemeWidth > width) {
-			// Add specific reset for underline only (preserves background)
-			const lineEndReset = tracker.getLineEndReset();
-			if (lineEndReset) {
-				currentLine += lineEndReset;
-			}
-			lines.push(currentLine);
-			currentLine = tracker.getActiveCodes();
-			currentWidth = 0;
-		}
-
-		currentLine += grapheme;
-		currentWidth += graphemeWidth;
-	}
-
-	if (currentLine) {
-		// No reset at end of final segment - caller handles continuation
-		lines.push(currentLine);
-	}
-
-	return lines.length > 0 ? lines : [""];
-}
-
-/**
- * Apply background color to a line, padding to full width.
- *
- * @param line - Line of text (may contain ANSI codes)
- * @param width - Total width to pad to
- * @param bgFn - Background color function
- * @returns Line with background applied and padded to width
- */
-export function applyBackgroundToLine(line: string, width: number, bgFn: (text: string) => string): string {
-	// Calculate padding needed
-	const visibleLen = visibleWidth(line);
-	const paddingNeeded = Math.max(0, width - visibleLen);
-	const padding = " ".repeat(paddingNeeded);
-
-	// Apply background to content + padding
-	const withPadding = line + padding;
-	return bgFn(withPadding);
+function ellipsisStringToKind(ellipsis: string): number {
+	if (ellipsis === "\u2026") return EllipsisKind.Unicode;
+	if (ellipsis === "..." || ellipsis === undefined) return EllipsisKind.Ascii;
+	if (ellipsis === "") return EllipsisKind.None;
+	// Default: "..." maps to Ascii
+	return EllipsisKind.Ascii;
 }
 
 /**
  * Truncate text to fit within a maximum visible width, adding ellipsis if needed.
  * Optionally pad with spaces to reach exactly maxWidth.
- * Properly handles ANSI escape codes (they don't count toward width).
+ * Delegates to the native Rust implementation.
  *
  * @param text - Text to truncate (may contain ANSI codes)
  * @param maxWidth - Maximum visible width
@@ -695,76 +128,7 @@ export function truncateToWidth(
 	ellipsis: string = "...",
 	pad: boolean = false,
 ): string {
-	const textVisibleWidth = visibleWidth(text);
-
-	if (textVisibleWidth <= maxWidth) {
-		return pad ? text + " ".repeat(maxWidth - textVisibleWidth) : text;
-	}
-
-	const ellipsisWidth = visibleWidth(ellipsis);
-	const targetWidth = maxWidth - ellipsisWidth;
-
-	if (targetWidth <= 0) {
-		return ellipsis.substring(0, maxWidth);
-	}
-
-	// Separate ANSI codes from visible content using grapheme segmentation
-	let i = 0;
-	const segments: Array<{ type: "ansi" | "grapheme"; value: string }> = [];
-
-	while (i < text.length) {
-		const ansiResult = extractAnsiCode(text, i);
-		if (ansiResult) {
-			segments.push({ type: "ansi", value: ansiResult.code });
-			i += ansiResult.length;
-		} else {
-			// Find the next ANSI code or end of string
-			let end = i;
-			while (end < text.length) {
-				const nextAnsi = extractAnsiCode(text, end);
-				if (nextAnsi) break;
-				end++;
-			}
-			// Segment this non-ANSI portion into graphemes
-			const textPortion = text.slice(i, end);
-			for (const seg of segmenter.segment(textPortion)) {
-				segments.push({ type: "grapheme", value: seg.segment });
-			}
-			i = end;
-		}
-	}
-
-	// Build truncated string from segments
-	let result = "";
-	let currentWidth = 0;
-
-	for (const seg of segments) {
-		if (seg.type === "ansi") {
-			result += seg.value;
-			continue;
-		}
-
-		const grapheme = seg.value;
-		// Skip empty graphemes to avoid issues with string-width calculation
-		if (!grapheme) continue;
-
-		const graphemeWidth = visibleWidth(grapheme);
-
-		if (currentWidth + graphemeWidth > targetWidth) {
-			break;
-		}
-
-		result += grapheme;
-		currentWidth += graphemeWidth;
-	}
-
-	// Add reset code before ellipsis to prevent styling leaking into it
-	const truncated = `${result}\x1b[0m${ellipsis}`;
-	if (pad) {
-		const truncatedWidth = visibleWidth(truncated);
-		return truncated + " ".repeat(Math.max(0, maxWidth - truncatedWidth));
-	}
-	return truncated;
+	return nativeTruncateToWidth(text, maxWidth, ellipsisStringToKind(ellipsis), pad);
 }
 
 /**
@@ -782,54 +146,12 @@ export function sliceWithWidth(
 	length: number,
 	strict = false,
 ): { text: string; width: number } {
-	if (length <= 0) return { text: "", width: 0 };
-	const endCol = startCol + length;
-	let result = "",
-		resultWidth = 0,
-		currentCol = 0,
-		i = 0,
-		pendingAnsi = "";
-
-	while (i < line.length) {
-		const ansi = extractAnsiCode(line, i);
-		if (ansi) {
-			if (currentCol >= startCol && currentCol < endCol) result += ansi.code;
-			else if (currentCol < startCol) pendingAnsi += ansi.code;
-			i += ansi.length;
-			continue;
-		}
-
-		let textEnd = i;
-		while (textEnd < line.length && !extractAnsiCode(line, textEnd)) textEnd++;
-
-		for (const { segment } of segmenter.segment(line.slice(i, textEnd))) {
-			const w = graphemeWidth(segment);
-			const inRange = currentCol >= startCol && currentCol < endCol;
-			const fits = !strict || currentCol + w <= endCol;
-			if (inRange && fits) {
-				if (pendingAnsi) {
-					result += pendingAnsi;
-					pendingAnsi = "";
-				}
-				result += segment;
-				resultWidth += w;
-			}
-			currentCol += w;
-			if (currentCol >= endCol) break;
-		}
-		i = textEnd;
-		if (currentCol >= endCol) break;
-	}
-	return { text: result, width: resultWidth };
+	return nativeSliceWithWidth(line, startCol, length, strict);
 }
 
-// Pooled tracker instance for extractSegments (avoids allocation per call)
-const pooledStyleTracker = new AnsiCodeTracker();
-
 /**
  * Extract "before" and "after" segments from a line in a single pass.
- * Used for overlay compositing where we need content before and after the overlay region.
- * Preserves styling from before the overlay that should affect content after it.
+ * Delegates to the native Rust implementation.
  */
 export function extractSegments(
 	line: string,
@@ -838,68 +160,22 @@ export function extractSegments(
 	afterLen: number,
 	strictAfter = false,
 ): { before: string; beforeWidth: number; after: string; afterWidth: number } {
-	let before = "",
-		beforeWidth = 0,
-		after = "",
-		afterWidth = 0;
-	let currentCol = 0,
-		i = 0;
-	let pendingAnsiBefore = "";
-	let afterStarted = false;
-	const afterEnd = afterStart + afterLen;
-
-	// Track styling state so "after" inherits styling from before the overlay
-	pooledStyleTracker.clear();
-
-	while (i < line.length) {
-		const ansi = extractAnsiCode(line, i);
-		if (ansi) {
-			// Track all SGR codes to know styling state at afterStart
-			pooledStyleTracker.process(ansi.code);
-			// Include ANSI codes in their respective segments
-			if (currentCol < beforeEnd) {
-				pendingAnsiBefore += ansi.code;
-			} else if (currentCol >= afterStart && currentCol < afterEnd && afterStarted) {
-				// Only include after we've started "after" (styling already prepended)
-				after += ansi.code;
-			}
-			i += ansi.length;
-			continue;
-		}
-
-		let textEnd = i;
-		while (textEnd < line.length && !extractAnsiCode(line, textEnd)) textEnd++;
-
-		for (const { segment } of segmenter.segment(line.slice(i, textEnd))) {
-			const w = graphemeWidth(segment);
-
-			if (currentCol < beforeEnd) {
-				if (pendingAnsiBefore) {
-					before += pendingAnsiBefore;
-					pendingAnsiBefore = "";
-				}
-				before += segment;
-				beforeWidth += w;
-			} else if (currentCol >= afterStart && currentCol < afterEnd) {
-				const fits = !strictAfter || currentCol + w <= afterEnd;
-				if (fits) {
-					// On first "after" grapheme, prepend inherited styling from before overlay
-					if (!afterStarted) {
-						after += pooledStyleTracker.getActiveCodes();
-						afterStarted = true;
-					}
-					after += segment;
-					afterWidth += w;
-				}
-			}
-
-			currentCol += w;
-			// Early exit: done with "before" only, or done with both segments
-			if (afterLen <= 0 ? currentCol >= beforeEnd : currentCol >= afterEnd) break;
-		}
-		i = textEnd;
-		if (afterLen <= 0 ? currentCol >= beforeEnd : currentCol >= afterEnd) break;
-	}
-
-	return { before, beforeWidth, after, afterWidth };
+	return nativeExtractSegments(line, beforeEnd, afterStart, afterLen, strictAfter);
+}
+
+/**
+ * Apply background color to a line, padding to full width.
+ *
+ * @param line - Line of text (may contain ANSI codes)
+ * @param width - Total width to pad to
+ * @param bgFn - Background color function
+ * @returns Line with background applied and padded to width
+ */
+export function applyBackgroundToLine(line: string, width: number, bgFn: (text: string) => string): string {
+	const visibleLen = visibleWidth(line);
+	const paddingNeeded = Math.max(0, width - visibleLen);
+	const padding = " ".repeat(paddingNeeded);
+
+	const withPadding = line + padding;
+	return bgFn(withPadding);
 }