Polish UI: SearchBar sizing, SessionList layout, Tooltip offset, and progress CSS

SearchBar:
- Switch from fixed w-80/sm:w-96 to fluid min-w-80 max-w-md w-full
- Adjust left padding for better visual alignment with search icon

SessionList:
- Memoize project grouping computation with useMemo
- Move horizontal padding from per-item margin (mx-2 + width calc hack)
  to container padding (px-2) for cleaner layout and full-width buttons
- Remove inline width override that was compensating for the old margins

Tooltip:
- Increase offset from 8px to 12px for better visual separation

CSS:
- Add prose-message-progress variant with compact 11px mono typography
  for progress event content (code blocks, tables, links, blockquotes)
- Reduce search minimap marker height from 4px to 3px
- Normalize prose-message line-height: paragraphs 1.625→1.6, list
  items 1.5→1.6 for consistent rhythm
- Switch custom checkbox checkmark sizing from fixed px to percentages
  for better scaling across different zoom levels

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/client/components/SearchBar.tsx

@@ -107,7 +107,7 @@ export function SearchBar({
   const showControls = !!localQuery || !!query;
 
   return (
-    <div className="w-80 sm:w-96">
+    <div className="min-w-80 max-w-md w-full">
       {/* Unified search container */}
       <div
         className={`
@@ -137,7 +137,7 @@ export function SearchBar({
           onFocus={() => setIsFocused(true)}
           onBlur={() => setIsFocused(false)}
           placeholder="Search messages..."
-          className="flex-1 min-w-0 bg-transparent px-2.5 py-2 text-body text-foreground
+          className="flex-1 min-w-0 bg-transparent pl-3 pr-2.5 py-2 text-body text-foreground
                      placeholder:text-foreground-muted
                      focus:outline-none"
         />

src/client/components/SessionList.tsx

@@ -1,4 +1,4 @@
-import React, { useState, useEffect } from "react";
+import React, { useState, useEffect, useMemo } from "react";
 import type { SessionEntry } from "../lib/types";
 
 interface Props {
@@ -11,13 +11,16 @@ interface Props {
 export function SessionList({ sessions, loading, selectedId, onSelect }: Props) {
   const [selectedProject, setSelectedProject] = useState<string | null>(null);
 
-  // Group by project
+  // Group by project (memoized to avoid recomputing on unrelated rerenders)
-  const grouped = new Map<string, SessionEntry[]>();
+  const grouped = useMemo(() => {
-  for (const session of sessions) {
+    const map = new Map<string, SessionEntry[]>();
-    const group = grouped.get(session.project) || [];
+    for (const session of sessions) {
-    group.push(session);
+      const group = map.get(session.project) || [];
-    grouped.set(session.project, group);
+      group.push(session);
-  }
+      map.set(session.project, group);
+    }
+    return map;
+  }, [sessions]);
 
   // Auto-select project when selectedId changes
   useEffect(() => {
@@ -73,7 +76,7 @@ export function SessionList({ sessions, loading, selectedId, onSelect }: Props)
         <div className="px-4 py-2 text-caption font-semibold text-foreground-muted uppercase tracking-wider border-b border-border-muted" style={{ background: "var(--color-surface-inset)" }}>
           {formatProjectName(selectedProject)}
         </div>
-        <div className="py-1">
+        <div className="py-1 px-2">
           {projectSessions.map((session, idx) => {
             const isSelected = selectedId === session.id;
             return (
@@ -81,13 +84,13 @@ export function SessionList({ sessions, loading, selectedId, onSelect }: Props)
                 key={session.id}
                 onClick={() => onSelect(session.id)}
                 className={`
-                  w-full text-left mx-2 my-0.5 px-3 py-2.5 rounded-lg transition-all duration-200
+                  w-full text-left my-0.5 px-3 py-2.5 rounded-lg transition-all duration-200
                   ${isSelected
                     ? "bg-accent-light shadow-glow-accent ring-1 ring-accent/25"
                     : "hover:bg-surface-overlay"
                   }
                 `}
-                style={{ width: "calc(100% - 1rem)", animationDelay: `${idx * 30}ms` }}
+                style={{ animationDelay: `${idx * 30}ms` }}
               >
                 <div className={`text-body font-medium truncate ${isSelected ? "text-accent-dark" : "text-foreground"}`}>
                   {session.summary || session.firstPrompt || "Untitled Session"}
@@ -113,7 +116,7 @@ export function SessionList({ sessions, loading, selectedId, onSelect }: Props)
 
   // Project list
   return (
-    <div className="py-1 animate-fade-in">
+    <div className="py-1 px-2 animate-fade-in">
       {[...grouped.entries()].map(([project, projectSessions]) => {
         const latest = projectSessions.reduce((a, b) =>
           (a.modified || a.created) > (b.modified || b.created) ? a : b
@@ -123,8 +126,7 @@ export function SessionList({ sessions, loading, selectedId, onSelect }: Props)
           <button
             key={project}
             onClick={() => setSelectedProject(project)}
-            className="w-full text-left mx-2 my-0.5 px-3 py-2.5 rounded-lg hover:bg-surface-overlay transition-all duration-200 group"
+            className="w-full text-left my-0.5 px-3 py-2.5 rounded-lg hover:bg-surface-overlay transition-all duration-200 group"
-            style={{ width: "calc(100% - 1rem)" }}
           >
             <div className="flex items-center justify-between">
               <div className="text-body font-medium text-foreground truncate">

src/client/components/Tooltip.tsx

@@ -68,7 +68,7 @@ export function Tooltip({ content, children, delayMs = 150, side = "top" }: Prop
           style={{
             position: "fixed",
             left: position.x,
-            top: side === "top" ? position.y - 8 : position.y + 8,
+            top: side === "top" ? position.y - 12 : position.y + 12,
             zIndex: 9999,
           }}
           data-side={side}

src/client/styles/main.css

@@ -247,7 +247,7 @@ mark.search-highlight {
   position: absolute;
   right: 0;
   width: 8px;
-  height: 4px;
+  height: 3px;
   background: rgba(254, 240, 138, 0.7);
   border: none;
   padding: 0;
@@ -362,7 +362,7 @@ mark.search-highlight {
 .prose-message p {
   margin-top: 0.5rem;
   margin-bottom: 0.5rem;
-  line-height: 1.625;
+  line-height: 1.6;
 }
 
 .prose-message p:first-child {
@@ -383,7 +383,7 @@ mark.search-highlight {
 .prose-message li {
   margin-top: 0.25rem;
   margin-bottom: 0.25rem;
-  line-height: 1.5;
+  line-height: 1.6;
 }
 
 .prose-message code:not(pre code) {
@@ -445,6 +445,116 @@ mark.search-highlight {
   font-weight: 600;
 }
 
+/* ═══════════════════════════════════════════════
+   Progress markdown (compact variant)
+   ═══════════════════════════════════════════════ */
+
+.prose-message-progress {
+  font-family: "JetBrains Mono", "Fira Code", "SF Mono", ui-monospace, monospace;
+  font-size: 11px;
+  line-height: 1.5;
+  color: var(--color-foreground-secondary);
+  word-break: break-word;
+}
+
+.prose-message-progress h1,
+.prose-message-progress h2,
+.prose-message-progress h3,
+.prose-message-progress h4,
+.prose-message-progress h5,
+.prose-message-progress h6 {
+  font-size: 12px;
+  font-weight: 600;
+  color: var(--color-foreground);
+  margin-top: 0.25rem;
+  margin-bottom: 0.25rem;
+}
+
+.prose-message-progress p {
+  margin-top: 0.125rem;
+  margin-bottom: 0.125rem;
+}
+
+.prose-message-progress p:first-child {
+  margin-top: 0;
+}
+
+.prose-message-progress p:last-child {
+  margin-bottom: 0;
+}
+
+.prose-message-progress ul,
+.prose-message-progress ol {
+  margin-top: 0.25rem;
+  margin-bottom: 0.25rem;
+  padding-left: 1rem;
+}
+
+.prose-message-progress li {
+  margin-top: 0.125rem;
+  margin-bottom: 0.125rem;
+  line-height: 1.5;
+}
+
+.prose-message-progress code:not(pre code) {
+  font-family: inherit;
+  font-size: 0.9em;
+  padding: 0.0625rem 0.25rem;
+  border-radius: 0.1875rem;
+  background: var(--color-surface-inset);
+  border: 1px solid var(--color-border-muted);
+  color: #c4a1ff;
+  font-weight: 500;
+}
+
+.prose-message-progress pre {
+  margin-top: 0.5rem;
+  margin-bottom: 0.5rem;
+  max-width: 100%;
+  overflow-x: auto;
+}
+
+.prose-message-progress blockquote {
+  border-left: 2px solid var(--color-border);
+  padding-left: 0.5rem;
+  color: var(--color-foreground-secondary);
+  margin-top: 0.25rem;
+  margin-bottom: 0.25rem;
+}
+
+.prose-message-progress a {
+  color: var(--color-accent);
+  text-decoration: underline;
+  text-underline-offset: 2px;
+  text-decoration-color: rgba(91, 156, 245, 0.3);
+  transition: text-decoration-color 150ms;
+}
+
+.prose-message-progress a:hover {
+  color: var(--color-accent-dark);
+  text-decoration-color: rgba(125, 180, 255, 0.6);
+}
+
+.prose-message-progress table {
+  width: 100%;
+  border-collapse: collapse;
+  margin-top: 0.375rem;
+  margin-bottom: 0.375rem;
+  font-size: 11px;
+}
+
+.prose-message-progress th,
+.prose-message-progress td {
+  border: 1px solid var(--color-border-muted);
+  padding: 0.25rem 0.5rem;
+  text-align: left;
+}
+
+.prose-message-progress th {
+  background: var(--color-surface-inset);
+  font-weight: 600;
+}
+
 /* ═══════════════════════════════════════════════
    Focus ring system
    ═══════════════════════════════════════════════ */
@@ -481,10 +591,10 @@ mark.search-highlight {
 .custom-checkbox:checked::after {
   content: "";
   position: absolute;
-  top: 1px;
+  top: 6.25%;
-  left: 4px;
+  left: 25%;
-  width: 5px;
+  width: 31.25%;
-  height: 9px;
+  height: 56.25%;
   border: solid #0c1017;
   border-width: 0 2px 2px 0;
   transform: rotate(45deg);