Combine ANSI style codes into a single span element

Multiple SGR parameters in one escape sequence (e.g. bold + color)
were each opening a new span, losing earlier styles. Collect styles
per sequence and emit one span with all of them.

src/client/ansi.ts

@@ -17,14 +17,10 @@ const COLORS: Record<number, string> = {
   97: '#fff',     // bright white
 }
 
-const ESC = /\x1b\[([0-9;]*)m/g
-
-const escape = (s: string) =>
-  s.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;')
-
 export function ansiToHtml(text: string): string {
   if (!text.includes('\x1b')) return escape(text)
 
+  const ESC = /\x1b\[([0-9;]*)m/g
   let result = ''
   let last = 0
   let open = false
@@ -35,24 +31,26 @@ export function ansiToHtml(text: string): string {
     last = match.index + match[0].length
 
     const codes = match[1] ? match[1].split(';').map(Number) : [0]
+    const styles: string[] = []
 
     for (const code of codes) {
       if (code === 0 || code === 39) {
+        styles.length = 0
         if (open) { result += '</span>'; open = false }
       } else if (COLORS[code]) {
-        if (open) result += '</span>'
-        result += `<span style="color:${COLORS[code]}">`
-        open = true
+        styles.push(`color:${COLORS[code]}`)
       } else if (code === 1) {
-        if (open) result += '</span>'
-        result += '<span style="font-weight:bold">'
-        open = true
+        styles.push('font-weight:bold')
       } else if (code === 2) {
-        if (open) result += '</span>'
-        result += '<span style="opacity:0.7">'
-        open = true
+        styles.push('opacity:0.7')
       }
     }
+
+    if (styles.length) {
+      if (open) result += '</span>'
+      result += `<span style="${styles.join(';')}">`
+      open = true
+    }
   }
 
   result += escape(text.slice(last))
@@ -60,3 +58,6 @@ export function ansiToHtml(text: string): string {
 
   return result
 }
+
+const escape = (s: string) =>
+  s.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;')