feat: standardize LoRA Manager frontend with CSS classes and improved styles

- Replace inline styles with CSS classes for better maintainability
- Update class names to use consistent 'lm-' prefix across components
- Add comprehensive CSS stylesheet with tooltip system and responsive layouts
- Improve accessibility with proper focus states and keyboard navigation
- Implement hover and active state transitions for enhanced UX
- Refactor expand button to use CSS classes instead of inline styles
- Update test files to reflect new class naming convention

web/comfyui/lm_styles_loader.js

@@ -0,0 +1,37 @@
+const STYLE_ID = "lm-lora-shared-styles";
+let stylePromise = null;
+
+function injectStyles(cssText) {
+  let styleEl = document.getElementById(STYLE_ID);
+  if (!styleEl) {
+    styleEl = document.createElement("style");
+    styleEl.id = STYLE_ID;
+    document.head.appendChild(styleEl);
+  }
+  styleEl.textContent = cssText;
+}
+
+async function loadCssText() {
+  const cssUrl = new URL("./lm_styles.css", import.meta.url);
+  const response = await fetch(cssUrl);
+  if (!response.ok) {
+    throw new Error(`Failed to load ${cssUrl}`);
+  }
+  return await response.text();
+}
+
+export function ensureLmStyles() {
+  if (!stylePromise) {
+    stylePromise = loadCssText()
+      .then((cssText) => {
+        injectStyles(cssText);
+        return true;
+      })
+      .catch((error) => {
+        console.warn("Failed to load LoRA Manager styles", error);
+        stylePromise = null;
+        return false;
+      });
+  }
+  return stylePromise;
+}