From c50de49a59ca015022fd4264eb50e4f3bf6ea2ab Mon Sep 17 00:00:00 2001
From: Shantur Rathore <i@shantur.com>
Date: Thu, 18 Jun 2026 21:27:22 +0100
Subject: [PATCH] style(ui): align markdown code block chrome

Update fenced markdown code blocks to use square corners and compact headers matching the tool-call code output treatment.

The shared markdown styles now remove code block radii, shrink the header to the same 1.6rem control height, and restyle the copy action as a compact icon-only header button while keeping the accessible copy label available to screen readers.

Validated with npm run build:ui; Vite completed successfully with existing warnings about JSX import source, mixed static/dynamic imports, and large chunks.
---
 packages/ui/src/styles/markdown.css | 61 ++++++++++++++++++-----------
 1 file changed, 38 insertions(+), 23 deletions(-)

diff --git a/packages/ui/src/styles/markdown.css b/packages/ui/src/styles/markdown.css
index 6c4341e0..5e95c471 100644
--- a/packages/ui/src/styles/markdown.css
+++ b/packages/ui/src/styles/markdown.css
@@ -227,7 +227,7 @@
   .markdown-code-block {
     position: relative;
     margin: 10px 0;
-    border-radius: 6px;
+    border-radius: 0;
     background-color: var(--surface-muted);
     border: 1px solid var(--border-base);
   }
@@ -236,52 +236,63 @@
     display: flex;
     align-items: center;
     justify-content: space-between;
-    padding: 4px 8px;
+    min-height: 1.6rem;
+    padding: 0 0 0 var(--space-sm);
     background-color: var(--surface-secondary);
     border-bottom: 1px solid var(--border-base);
-    /* border-top-left-radius: 6px;
-    border-top-right-radius: 6px; */
   }
 
   .code-block-language {
-    font-family: var(--font-family-mono);
-    color: var(--text-secondary);
+    font-family: var(--message-part-header-font-family);
+    color: var(--text-primary);
     text-transform: uppercase;
-    letter-spacing: 0.04em;
-    font-size: var(--font-size-sm);
+    letter-spacing: normal;
+    font-size: var(--message-part-header-type-font-size);
+    font-weight: var(--message-part-header-type-font-weight);
+    line-height: var(--message-part-header-title-line-height);
   }
 
   .code-block-copy {
-    display: flex;
+    display: inline-flex;
     align-items: center;
-    gap: 4px;
-    padding: 4px 8px;
+    justify-content: center;
+    gap: 0;
+    width: 1.6rem;
+    height: 1.6rem;
+    padding: 0;
     background-color: transparent;
-    border: 1px solid var(--border-base);
-    border-radius: 4px;
+    border: none;
+    border-radius: 0.25rem;
     cursor: pointer;
     color: var(--text-secondary);
+    flex: 0 0 auto;
     transition:
       background-color 150ms ease,
-      color 150ms ease,
-      border-color 150ms ease;
+      color 150ms ease;
     margin-inline-start: auto;
-    font-size: var(--font-size-sm);
+    margin-inline-end: var(--space-sm);
   }
 
   .code-block-copy:hover {
-    background-color: var(--surface-hover);
-    border-color: var(--accent-primary);
-    color: var(--accent-primary);
+    background-color: transparent;
+    color: var(--text-primary);
   }
 
   .code-block-copy .copy-icon {
-    width: 14px;
-    height: 14px;
+    width: 0.875rem;
+    height: 0.875rem;
   }
 
   .code-block-copy .copy-text {
-    font-family: var(--font-family-mono);
+    position: absolute;
+    width: 1px;
+    height: 1px;
+    padding: 0;
+    margin: -1px;
+    overflow: hidden;
+    clip: rect(0, 0, 0, 0);
+    white-space: nowrap;
+    border: 0;
   }
 
   .markdown-code-block pre {
@@ -289,7 +300,11 @@
     padding: 12px !important;
     overflow-x: auto;
     background-color: transparent !important;
-    border-radius: 0;
+    border-radius: 0 !important;
+  }
+
+  .markdown-code-block .shiki {
+    border-radius: 0 !important;
   }
 
   .markdown-code-block code {