diff --git a/src/css/channel/animations.css b/src/css/channel/animations.css
index a0ba1a3..aaedf46 100644
--- a/src/css/channel/animations.css
+++ b/src/css/channel/animations.css
@@ -36,3 +36,254 @@
   align-self: center;
   flex-shrink: 0;
 }
+
+.thread-panel,
+.pin-panel {
+  width: min(380px, 42vw);
+  min-width: 320px;
+  height: 100%;
+  display: flex;
+  flex-direction: column;
+  flex-shrink: 0;
+  background:
+    linear-gradient(180deg, color-mix(in oklch, var(--surface-elevated) 92%, var(--accent-bg)), var(--surface-ground) 180px),
+    var(--surface-ground);
+  border-left: 1px solid var(--border-subtle);
+  box-shadow: -12px 0 24px oklch(0 0 0 / 6%);
+}
+
+.thread-panel-header,
+.pin-panel-header {
+  min-height: 52px;
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 12px;
+  padding: 0 14px 0 16px;
+  border-bottom: 1px solid var(--border-subtle);
+  background: color-mix(in oklch, var(--surface-elevated) 88%, transparent);
+  backdrop-filter: blur(10px);
+}
+
+.thread-panel-title,
+.pin-panel-title {
+  min-width: 0;
+  display: flex;
+  align-items: center;
+  gap: 8px;
+}
+
+.thread-preview-text {
+  max-width: 180px;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.thread-close-btn {
+  width: 30px;
+  height: 30px;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  border: 1px solid transparent;
+  border-radius: 8px;
+  background: transparent;
+  color: var(--text-muted);
+  cursor: pointer;
+  transition: background 120ms ease, border-color 120ms ease, color 120ms ease;
+}
+
+.thread-close-btn:hover {
+  background: var(--hover-bg);
+  border-color: var(--border-subtle);
+  color: var(--text-primary);
+}
+
+.thread-messages,
+.pin-list {
+  flex: 1;
+  min-height: 0;
+  overflow-y: auto;
+  padding: 12px;
+}
+
+.thread-message {
+  display: flex;
+  gap: 10px;
+  padding: 10px;
+  border: 1px solid transparent;
+  border-radius: 12px;
+  transition: background 120ms ease, border-color 120ms ease;
+}
+
+.thread-message:hover {
+  background: var(--hover-bg);
+  border-color: var(--border-subtle);
+}
+
+.thread-list-item {
+  display: flex;
+  width: 100%;
+  flex-direction: column;
+  gap: 5px;
+  padding: 12px;
+  border: 1px solid var(--border-subtle);
+  border-radius: 14px;
+  background: color-mix(in oklch, var(--surface-elevated) 94%, var(--accent-bg));
+  color: var(--text-primary);
+  text-align: left;
+  cursor: pointer;
+  transition: transform 120ms ease, border-color 120ms ease, background 120ms ease;
+}
+
+.thread-list-item:hover:not(:disabled) {
+  transform: translateY(-1px);
+  border-color: var(--border-default);
+  background: var(--surface-elevated);
+}
+
+.thread-list-item:disabled {
+  cursor: default;
+  opacity: 0.75;
+}
+
+.thread-message-content {
+  min-width: 0;
+  flex: 1;
+}
+
+.thread-message-header {
+  display: flex;
+  align-items: baseline;
+  gap: 8px;
+  margin-bottom: 2px;
+}
+
+.thread-typing {
+  padding: 0 14px 8px;
+}
+
+.thread-input-area {
+  position: relative;
+  display: flex;
+  align-items: flex-end;
+  gap: 8px;
+  padding: 12px;
+  border-top: 1px solid var(--border-subtle);
+  background: color-mix(in oklch, var(--surface-elevated) 86%, transparent);
+}
+
+.thread-input {
+  min-height: 38px;
+  max-height: 120px;
+  flex: 1;
+  resize: none;
+  outline: none;
+  border: 1px solid var(--border-default);
+  border-radius: 12px;
+  padding: 9px 11px;
+  background: var(--input-bg);
+  color: var(--text-primary);
+  font-size: 13px;
+  line-height: 1.45;
+}
+
+.thread-input:focus {
+  border-color: var(--input-ring);
+  box-shadow: 0 0 0 3px color-mix(in oklch, var(--input-ring) 18%, transparent);
+}
+
+.thread-reaction-btn,
+.thread-send-btn {
+  width: 38px;
+  height: 38px;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  border: 1px solid var(--border-default);
+  border-radius: 12px;
+  background: var(--surface-ground);
+  color: var(--text-secondary);
+  cursor: pointer;
+}
+
+.thread-send-btn {
+  background: var(--accent);
+  border-color: var(--accent);
+  color: var(--accent-fg);
+}
+
+.thread-send-btn:disabled {
+  opacity: 0.45;
+  cursor: not-allowed;
+}
+
+.thread-emoji-row {
+  position: absolute;
+  left: 12px;
+  bottom: 58px;
+  display: flex;
+  gap: 4px;
+  padding: 6px;
+  border: 1px solid var(--border-subtle);
+  border-radius: 12px;
+  background: var(--surface-overlay);
+  box-shadow: 0 10px 30px oklch(0 0 0 / 12%);
+}
+
+.emoji-quick-btn {
+  border: 0;
+  border-radius: 8px;
+  padding: 4px 6px;
+  background: transparent;
+  cursor: pointer;
+  font-size: 16px;
+}
+
+.emoji-quick-btn:hover {
+  background: var(--hover-bg);
+}
+
+.pin-list {
+  display: flex;
+  flex-direction: column;
+  gap: 10px;
+}
+
+.pin-item {
+  display: flex;
+  width: 100%;
+  padding: 12px;
+  border: 1px solid var(--border-subtle);
+  border-radius: 14px;
+  background: color-mix(in oklch, var(--surface-elevated) 94%, var(--accent-bg));
+  box-shadow: 0 1px 0 oklch(1 0 0 / 35%) inset;
+  transition: transform 120ms ease, border-color 120ms ease, background 120ms ease;
+}
+
+.pin-item:hover {
+  transform: translateY(-1px);
+  border-color: var(--border-default);
+  background: var(--surface-elevated);
+}
+
+.pin-empty {
+  min-height: 160px;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  text-align: center;
+}
+
+@media (max-width: 860px) {
+  .thread-panel,
+  .pin-panel {
+    position: absolute;
+    inset: 0 0 0 auto;
+    z-index: 30;
+    width: min(100%, 420px);
+    min-width: 0;
+    box-shadow: -18px 0 40px oklch(0 0 0 / 18%);
+  }
+}
diff --git a/vite.config.ts b/vite.config.ts
index dccd397..2a9d670 100644
--- a/vite.config.ts
+++ b/vite.config.ts
@@ -20,43 +20,6 @@ export default defineConfig({
     optimizeDeps: {
         entries: ["src/**/*.{ts,tsx}"],
     },
-    build: {
-        rollupOptions: {
-            output: {
-                manualChunks(id: string) {
-                    if (id.includes("node_modules")) {
-                        // React + deps that import React — keep together to avoid circular deps
-                        if (id.includes("react-dom") || id.includes("react-router-dom") || id.includes("scheduler") || id.includes("@tanstack/react-query")) {
-                            return "vendor-react";
-                        }
-                        if (id.includes("react-markdown") || id.includes("remark-gfm") || id.includes("rehype-raw") || id.includes("rehype-sanitize")) {
-                            return "vendor-markdown";
-                        }
-                        if (id.includes("lucide-react")) {
-                            return "vendor-lucide";
-                        }
-                        if (id.includes("motion")) {
-                            return "vendor-motion";
-                        }
-                        if (id.includes("recharts")) {
-                            return "vendor-recharts";
-                        }
-                        // Streamdown + diagram deps — keep together to avoid circular deps
-                        if (id.includes("streamdown") || id.includes("@streamdown") || id.includes("cytoscape") || id.includes("d3-") || id.includes("dagre")) {
-                            return "vendor-streamdown";
-                        }
-                        if (id.includes("@tanstack/react-table")) {
-                            return "vendor-table";
-                        }
-                        if (id.includes("radix-ui")) {
-                            return "vendor-radix";
-                        }
-                    }
-                },
-            },
-        },
-        chunkSizeWarningLimit: 400,
-    },
     resolve: {
         alias: {
             "@": path.resolve(__dirname, "./src"),