feat: collapsible long code blocks with expand/collapse toggle

Code blocks longer than 25 lines are now automatically collapsed,
showing only the first 10 lines with a gradient fade and a
'Show all N lines' button. Click to expand/collapse.

Also fixes version sync (package.json now matches v1.63.4)
and shows line count in the language header for long blocks.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "pinchchat",
-  "version": "1.63.2",
+  "version": "1.63.4",
   "description": "A sleek, dark-themed webchat UI for OpenClaw — monitor sessions, stream responses, and inspect tool calls in real-time.",
   "type": "module",
   "repository": {

src/components/CodeBlock.tsx

@@ -1,5 +1,5 @@
 import { useState, useCallback, type HTMLAttributes, type ReactElement } from 'react';
-import { Check, Copy, Hash, WrapText, AlignLeft } from 'lucide-react';
+import { Check, Copy, Hash, WrapText, AlignLeft, ChevronDown, ChevronUp } from 'lucide-react';
 
 /** Extract the language from the nested <code> element's className (e.g. "language-ts"). */
 function extractLanguage(children: React.ReactNode): string | null {
@@ -45,6 +45,8 @@ function formatLanguage(lang: string): string {
 const LINE_NUMBER_KEY = 'pinchchat-line-numbers';
 const WRAP_KEY = 'pinchchat-code-wrap';
 const LINE_THRESHOLD = 3; // Only show line numbers for blocks with more than this many lines
+const COLLAPSE_THRESHOLD = 25; // Collapse code blocks longer than this
+const COLLAPSE_PREVIEW_LINES = 10; // Lines to show when collapsed
 
 export function CodeBlock(props: HTMLAttributes<HTMLPreElement>) {
   const [copied, setCopied] = useState(false);
@@ -56,11 +58,13 @@ export function CodeBlock(props: HTMLAttributes<HTMLPreElement>) {
     const stored = localStorage.getItem(WRAP_KEY);
     return stored === 'true';
   });
+  const [isCollapsed, setIsCollapsed] = useState(true);
   const language = extractLanguage(props.children);
 
   const code = (props.children as ReactElement<{ children?: string }> | undefined)?.props?.children;
   const lines = typeof code === 'string' ? code.replace(/\n$/, '').split('\n') : [];
   const hasEnoughLines = lines.length > LINE_THRESHOLD;
+  const isCollapsible = lines.length > COLLAPSE_THRESHOLD;
 
   const handleCopy = useCallback(() => {
     if (typeof code === 'string') {
@@ -88,12 +92,15 @@ export function CodeBlock(props: HTMLAttributes<HTMLPreElement>) {
   }, []);
 
   const shouldShowNumbers = showLineNumbers && hasEnoughLines;
+  const collapsed = isCollapsible && isCollapsed;
+  const wrapStyle = wordWrap ? { whiteSpace: 'pre-wrap' as const, overflowWrap: 'break-word' as const, wordBreak: 'break-word' as const } : undefined;
+  const collapseStyle = collapsed ? { maxHeight: `${COLLAPSE_PREVIEW_LINES * 1.7142857}em`, overflow: 'hidden' as const } : undefined;
 
   return (
     <div className="group/code relative">
       {language && (
         <div className="flex items-center justify-between px-4 py-1.5 bg-pc-elevated/80 border-b border-pc-border rounded-t-lg text-[11px] text-pc-text-muted font-mono select-none">
-          <span>{formatLanguage(language)}</span>
+          <span>{formatLanguage(language)}{isCollapsible && <span className="ml-1.5 text-pc-text-faint">({lines.length} lines)</span>}</span>
           <div className="flex items-center gap-1">
             <button
               onClick={toggleWrap}
@@ -117,24 +124,44 @@ export function CodeBlock(props: HTMLAttributes<HTMLPreElement>) {
           </div>
         </div>
       )}
-      {shouldShowNumbers ? (
-        <div className={`flex ${language ? 'rounded-t-none' : 'rounded-lg'} overflow-hidden`}>
-          <div
-            className="flex-shrink-0 select-none text-right pr-3 pl-3 py-4 text-[11px] leading-[1.7142857] font-mono text-pc-text-muted/40 bg-pc-elevated/40 border-r border-pc-border/50"
-            aria-hidden="true"
-          >
-            {lines.map((_, i) => (
-              <div key={i}>{i + 1}</div>
-            ))}
+      <div className="relative">
+        {shouldShowNumbers ? (
+          <div className={`flex ${language ? 'rounded-t-none' : 'rounded-lg'} overflow-hidden`} style={collapseStyle}>
+            <div
+              className="flex-shrink-0 select-none text-right pr-3 pl-3 py-4 text-[11px] leading-[1.7142857] font-mono text-pc-text-muted/40 bg-pc-elevated/40 border-r border-pc-border/50"
+              aria-hidden="true"
+            >
+              {(collapsed ? lines.slice(0, COLLAPSE_PREVIEW_LINES) : lines).map((_, i) => (
+                <div key={i}>{i + 1}</div>
+              ))}
+            </div>
+            <pre {...props} className={`${props.className || ''} flex-1 !rounded-none !mt-0 min-w-0`} style={wrapStyle} />
           </div>
-          <pre {...props} className={`${props.className || ''} flex-1 !rounded-none !mt-0 min-w-0`} style={wordWrap ? { whiteSpace: 'pre-wrap', overflowWrap: 'break-word', wordBreak: 'break-word' } : undefined} />
-        </div>
-      ) : (
-        <pre {...props} className={`${props.className || ''} ${language ? '!rounded-t-none !mt-0' : ''}`} style={wordWrap ? { whiteSpace: 'pre-wrap', overflowWrap: 'break-word', wordBreak: 'break-word' } : undefined} />
+        ) : (
+          <div style={collapseStyle}>
+            <pre {...props} className={`${props.className || ''} ${language ? '!rounded-t-none !mt-0' : ''}`} style={wrapStyle} />
+          </div>
+        )}
+        {collapsed && (
+          <div className="absolute bottom-0 left-0 right-0 h-16 bg-gradient-to-t from-[var(--pc-bg-surface)] to-transparent pointer-events-none rounded-b-lg" />
+        )}
+      </div>
+      {isCollapsible && (
+        <button
+          onClick={() => setIsCollapsed(prev => !prev)}
+          className="flex items-center justify-center gap-1.5 w-full py-1.5 text-[11px] text-pc-text-muted hover:text-pc-text-secondary bg-pc-elevated/40 hover:bg-pc-elevated/60 border-t border-pc-border transition-colors rounded-b-lg"
+          type="button"
+        >
+          {isCollapsed ? (
+            <><ChevronDown className="h-3 w-3" /><span>Show all {lines.length} lines</span></>
+          ) : (
+            <><ChevronUp className="h-3 w-3" /><span>Collapse</span></>
+          )}
+        </button>
       )}
       <button
         onClick={handleCopy}
-        className="absolute top-2 right-2 p-1.5 rounded-lg bg-pc-elevated/60 hover:bg-pc-elevated/80 border border-pc-border-strong text-pc-text-secondary hover:text-pc-text opacity-0 group-hover/code:opacity-100 transition-opacity duration-150"
+        className={`absolute ${language ? 'top-10' : 'top-2'} right-2 p-1.5 rounded-lg bg-pc-elevated/60 hover:bg-pc-elevated/80 border border-pc-border-strong text-pc-text-secondary hover:text-pc-text opacity-0 group-hover/code:opacity-100 transition-opacity duration-150`}
         title="Copy code"
         aria-label="Copy code to clipboard"
         type="button"