UI styling / code improvements (#307)

Clean up and improve UI styling

* fix: UI - dependency cleanup
* chore: UI - start script
* refactor: UI - Extract Header
* fix: UI - Header styling
* fix: UI - LogViewer styling
* fix: UI - Models styling
* fix: UI - Activity styling
* fix: UI - ConnectionStatus colors
* review: UI - table border colors

ui/src/components/ConnectionStatus.tsx

@@ -7,9 +7,9 @@ const ConnectionStatusIcon = () => {
   const eventStatusColor = useMemo(() => {
     switch (connectionStatus) {
       case "connected":
-        return "bg-green-500";
+        return "bg-emerald-500";
       case "connecting":
-        return "bg-yellow-500";
+        return "bg-amber-500";
       case "disconnected":
       default:
         return "bg-red-500";

ui/src/components/Header.tsx

@@ -0,0 +1,56 @@
+import { useCallback } from "react";
+import { RiMoonFill, RiSunFill } from "react-icons/ri";
+import { NavLink, type NavLinkRenderProps } from "react-router-dom";
+import { useTheme } from "../contexts/ThemeProvider";
+import ConnectionStatusIcon from "./ConnectionStatus";
+
+export function Header() {
+  const { screenWidth, toggleTheme, isDarkMode, appTitle, setAppTitle } = useTheme();
+  const handleTitleChange = useCallback(
+    (newTitle: string) => {
+      setAppTitle(newTitle.replace(/\n/g, "").trim().substring(0, 64) || "llama-swap");
+    },
+    [setAppTitle]
+  );
+
+  const navLinkClass = ({ isActive }: NavLinkRenderProps) =>
+    `text-gray-600 hover:text-black dark:text-gray-300 dark:hover:text-gray-100 p-1 ${isActive ? "font-semibold" : ""}`;
+
+  return (
+    <header className="flex items-center justify-between bg-surface border-b border-border p-2 px-4 h-[75px]">
+      {screenWidth !== "xs" && screenWidth !== "sm" && (
+        <h1
+          contentEditable
+          suppressContentEditableWarning
+          className="p-0 outline-none hover:bg-gray-100 dark:hover:bg-gray-700 rounded"
+          onBlur={(e) => handleTitleChange(e.currentTarget.textContent || "(set title)")}
+          onKeyDown={(e) => {
+            if (e.key === "Enter") {
+              e.preventDefault();
+              handleTitleChange(e.currentTarget.textContent || "(set title)");
+              e.currentTarget.blur();
+            }
+          }}
+        >
+          {appTitle}
+        </h1>
+      )}
+
+      <menu className="flex items-center gap-4">
+        <NavLink to="/" className={navLinkClass} type="button">
+          Logs
+        </NavLink>
+        <NavLink to="/models" className={navLinkClass} type="button">
+          Models
+        </NavLink>
+        <NavLink to="/activity" className={navLinkClass} type="button">
+          Activity
+        </NavLink>
+        <button className="" onClick={toggleTheme}>
+          {isDarkMode ? <RiMoonFill /> : <RiSunFill />}
+        </button>
+        <ConnectionStatusIcon />
+      </menu>
+    </header>
+  );
+}