feat(coding-agent): implemented width-aware text truncation and render caching across tool renderers

- Implemented width-aware text truncation across all tool renderers to respect terminal width constraints and prevent output overflow.
- Enhanced render caching to include width parameter for cache invalidation when terminal width changes, improving cache accuracy.
- Migrated truncateToWidth function imports from render-utils to centralized tui module for better code organization.
- Introduced Hasher utility for generating width-aware cache keys in calculator, find, grep, todo-write, and write tools.
- Optimized box component rendering to only truncate lines that exceed content width, reducing unnecessary truncation operations.

packages/coding-agent/src/patch/shared.ts

@@ -19,7 +19,7 @@ import {
 	truncateDiffByHunk,
 } from "../tools/render-utils";
 import type { RenderCallOptions } from "../tools/renderers";
-import { Hasher, type RenderCache, renderStatusLine, truncateToWidth } from "../tui";
+import { Ellipsis, Hasher, type RenderCache, renderStatusLine, truncateToWidth } from "../tui";
 import type { DiffError, DiffResult, Operation } from "./types";
 
 // ═══════════════════════════════════════════════════════════════════════════
@@ -283,7 +283,8 @@ export const editToolRenderer = {
 					);
 				}
 
-				const lines = width > 0 ? text.split("\n").map(line => truncateToWidth(line, width)) : text.split("\n");
+				const lines =
+					width > 0 ? text.split("\n").map(line => truncateToWidth(line, width, Ellipsis.Omit)) : text.split("\n");
 				cached = { key, lines };
 				return lines;
 			},