feat: align chat rendering with CLI and trim frontend load weight

- Merge thinking and assistant text into one assistant bubble with ordered blocks

- Restyle tool execution blocks to match CLI layout and status

- Remove startup splash screen and ship woff2-only fonts in public

- Add default avatars when agent or user image is unset

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/src/components/chat/ToolCallBlock.module.css

@@ -1,5 +1,24 @@
-.collapsible {
+.block {
   margin: 0;
+  border-radius: 8px;
+  border: 1px solid #e5e7eb;
+  background: #f8fafc;
+  overflow: hidden;
+}
+
+.pending {
+  border-color: #dbeafe;
+  background: #f0f7ff;
+}
+
+.success {
+  border-color: #bbf7d0;
+  background: #f0fdf4;
+}
+
+.error {
+  border-color: #fecaca;
+  background: #fef2f2;
 }
 
 .summary {
@@ -7,45 +26,52 @@
   cursor: pointer;
   display: flex;
   align-items: center;
-  gap: 6px;
-  padding: 6px 10px;
+  justify-content: space-between;
+  gap: 8px;
+  padding: 8px 10px;
   user-select: none;
-  font-weight: 500;
-  color: #555;
 }
 
 .summary::-webkit-details-marker {
   display: none;
 }
 
-.summary::before {
-  content: "";
-  width: 0;
-  height: 0;
-  border-left: 5px solid #888;
-  border-top: 3.5px solid transparent;
-  border-bottom: 3.5px solid transparent;
+.toolName {
+  font-weight: 600;
+  color: #374151;
+  font-size: 0.92em;
+}
+
+.status {
   flex-shrink: 0;
-  transform: rotate(0deg);
-  transition: transform 0.15s ease;
+  font-size: 11px;
+  color: #6b7280;
 }
 
-.collapsible[open] > .summary::before {
-  transform: rotate(90deg);
+.pending .status {
+  color: #2563eb;
 }
 
-.summaryText {
-  min-width: 0;
-  flex: 1;
-  overflow: hidden;
-  text-overflow: ellipsis;
-  white-space: nowrap;
+.success .status {
+  color: #15803d;
+}
+
+.error .status {
+  color: #b91c1c;
 }
 
 .detail {
   margin: 0;
-  padding: 6px 10px 8px;
-  border-top: 1px solid #eee;
+  padding: 8px 10px 10px;
+  border-top: 1px solid rgba(0, 0, 0, 0.06);
+}
+
+.args {
+  margin: 0 0 6px;
+  font-size: 0.85em;
+  color: #6b7280;
+  font-family: var(--font-mono, ui-monospace, monospace);
+  word-break: break-all;
 }
 
 .detailPre {
@@ -55,6 +81,7 @@
   word-break: break-word;
   font-size: inherit;
   line-height: inherit;
+  font-family: var(--font-mono, ui-monospace, monospace);
 }
 
 .detailPre :global(.diffAdd) {