feat(ui): enhance theme toggle styling and add Chinese localization

- Redesign theme toggle with improved visual effects including gradient overlays, enhanced shadows, and smoother cubic-bezier transitions
- Update toggle dimensions and icon positioning for better visual balance
- Add SVG filter effects for sun/moon icons in dark mode
- Replace English UI text with Chinese localization in MilkdownEditor
- Refactor copilotPlugin by removing unused decoration functions and improving ghost mark text node handling

src/App.vue

@@ -74,63 +74,93 @@ function onChange(markdownValue) {
 
 .theme-toggle__track {
   position: relative;
-  width: 78px;
+  width: 72px;
-  height: 40px;
+  height: 36px;
   display: block;
   border-radius: 999px;
-  border: 1px solid var(--panel-border);
+  border: 2px solid var(--panel-border);
   background: linear-gradient(135deg, var(--toggle-bg-start), var(--toggle-bg-end));
-  box-shadow: var(--panel-shadow);
+  box-shadow: var(--panel-shadow), inset 0 2px 4px rgba(255, 255, 255, 0.1), inset 0 -2px 4px rgba(0, 0, 0, 0.1);
+  overflow: hidden;
+  transition: background 400ms ease, border-color 400ms ease, box-shadow 400ms ease;
+}
+
+.theme-toggle__track::before {
+  content: '';
+  position: absolute;
+  inset: 0;
+  background: linear-gradient(180deg, rgba(255,255,255,0.15) 0%, transparent 50%, rgba(0,0,0,0.1) 100%);
+  border-radius: 999px;
+  pointer-events: none;
+  transition: opacity 400ms ease;
 }
 
 .theme-toggle__thumb {
   position: absolute;
-  top: 3px;
+  top: 2px;
-  left: 3px;
+  left: 2px;
-  width: 32px;
+  width: 28px;
-  height: 32px;
+  height: 28px;
   border-radius: 50%;
-  background: var(--toggle-thumb-bg);
+  background: linear-gradient(135deg, var(--toggle-thumb-bg) 0%, var(--toggle-thumb-bg) 100%);
-  box-shadow: 0 5px 14px rgba(0, 0, 0, 0.2);
+  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.25), 0 0 0 1px rgba(0, 0, 0, 0.05), inset 0 1px 0 rgba(255, 255, 255, 0.4);
-  transition: transform 220ms ease;
+  transition: transform 400ms cubic-bezier(0.34, 1.56, 0.64, 1);
+  z-index: 2;
 }
 
 .theme-toggle__sun,
 .theme-toggle__moon {
   position: absolute;
   top: 50%;
-  width: 16px;
+  width: 18px;
-  height: 16px;
+  height: 18px;
   transform: translateY(-50%);
-  transition: opacity 200ms ease, transform 220ms ease;
+  transition: opacity 300ms ease, transform 400ms cubic-bezier(0.34, 1.56, 0.64, 1);
 }
 
 .theme-toggle__sun {
-  left: 12px;
+  left: 10px;
   color: var(--toggle-sun);
   opacity: 1;
-  transform: translateY(-50%) rotate(0deg);
+  transform: translateY(-50%) scale(1);
+}
+
+.theme-toggle__sun svg {
+  width: 18px;
+  height: 18px;
+  filter: drop-shadow(0 0 3px var(--toggle-sun));
 }
 
 .theme-toggle__moon {
-  right: 12px;
+  right: 10px;
   color: var(--toggle-moon);
-  opacity: 0.55;
+  opacity: 0.5;
-  transform: translateY(-50%) rotate(-16deg);
+  transform: translateY(-50%) scale(0.85);
+}
+
+.theme-toggle__moon svg {
+  width: 18px;
+  height: 18px;
 }
 
 .theme-toggle.is-dark .theme-toggle__thumb {
-  transform: translateX(38px);
+  transform: translateX(36px);
+  background: linear-gradient(135deg, var(--toggle-thumb-bg) 0%, #c8d4ec 100%);
 }
 
 .theme-toggle.is-dark .theme-toggle__sun {
-  opacity: 0.55;
+  opacity: 0.5;
-  transform: translateY(-50%) rotate(16deg);
+  transform: translateY(-50%) scale(0.85);
 }
 
 .theme-toggle.is-dark .theme-toggle__moon {
   opacity: 1;
-  transform: translateY(-50%) rotate(0deg);
+  transform: translateY(-50%) scale(1);
+  color: #c8d4ec;
+}
+
+.theme-toggle.is-dark .theme-toggle__moon svg {
+  filter: drop-shadow(0 0 4px rgba(200, 212, 236, 0.6));
 }
 
 .theme-toggle:focus-visible {

src/components/MilkdownEditor.vue

@@ -38,8 +38,8 @@
         <button
           type="button"
           class="action-btn"
-          aria-label="Insert Image"
+          aria-label="上传图片"
-          title="Insert Image"
+          title="上传图片"
           @click="toggleImageDropdown"
         >
           <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
@@ -47,11 +47,11 @@
             <circle cx="8.5" cy="8.5" r="1.5"/>
             <polyline points="21 15 16 10 5 21"/>
           </svg>
-          <span class="btn-tooltip">Insert Image</span>
+          <span class="btn-tooltip">上传图片</span>
         </button>
         <div v-if="showImageDropdown" class="image-dropdown">
-          <button type="button" @click="triggerImageUpload">Upload Local Image</button>
+          <button type="button" @click="triggerImageUpload">上传本地图片</button>
-          <button type="button" @click="showUrlDialog = true; showImageDropdown = false">Insert from URL</button>
+          <button type="button" @click="showUrlDialog = true; showImageDropdown = false">通过 URL 插入</button>
         </div>
       </div>
       <input type="file" ref="imageInputRef" @change="handleImageUpload" accept="image/*" style="display:none">
@@ -65,9 +65,14 @@
         :aria-label="aiButtonLabel"
         :title="aiButtonLabel"
       >
-        <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+        <svg v-if="aiEnabled && !isOverLimit" width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
-          <path d="M12 2a10 10 0 1 0 10 10A10 10 0 0 0 12 2z"/>
+          <path d="M12 3l1.9 3.9L18 9l-4.1 2.1L12 15l-1.9-3.9L6 9l4.1-2.1L12 3z"/>
-          <path d="M12 6v6l4 2"/>
+          <path d="M5 14l.9 1.8L8 16.7l-2.1.9L5 20l-.9-2.4L2 16.7l2.1-.9L5 14z"/>
+          <path d="M19 14l.6 1.2 1.4.6-1.4.6L19 18l-.6-1.6-1.4-.6 1.4-.6L19 14z"/>
+        </svg>
+        <svg v-else width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+          <circle cx="12" cy="12" r="9"/>
+          <line x1="5" y1="5" x2="19" y2="19"/>
         </svg>
         <span class="btn-tooltip">{{ aiButtonLabel }}</span>
       </button>
@@ -79,16 +84,16 @@
     
     <div v-if="showUrlDialog" class="url-dialog-overlay" @click.self="showUrlDialog = false">
       <div class="url-dialog">
-        <h3>Insert Image from URL</h3>
+        <h3>通过 URL 插入图片</h3>
         <input 
           v-model="imageUrl" 
           type="url" 
-          placeholder="Enter image URL"
+          placeholder="请输入图片 URL"
           @keyup.enter="insertImageFromUrl"
         />
         <div class="url-dialog-buttons">
-          <button type="button" class="dialog-btn primary" @click="insertImageFromUrl">Insert</button>
+          <button type="button" class="dialog-btn primary" @click="insertImageFromUrl">插入</button>
-          <button type="button" class="dialog-btn" @click="showUrlDialog = false; imageUrl = ''">Cancel</button>
+          <button type="button" class="dialog-btn" @click="showUrlDialog = false; imageUrl = ''">取消</button>
         </div>
       </div>
     </div>

src/plugins/copilotPlugin.ts

@@ -3,7 +3,6 @@ import { $prose, $ctx, $markSchema } from '@milkdown/kit/utils'
 import { parserCtx, serializerCtx } from '@milkdown/kit/core'
 import { Node as ProseNode, DOMParser, DOMSerializer } from '@milkdown/prose/model'
 import type { Ctx } from '@milkdown/kit/core'
-import { Decoration, DecorationSet } from '@milkdown/prose/view'
 import type { EditorView } from '@milkdown/prose/view'
 import { getOcrCache, OCR_SIZE_LIMIT, extractTextFromOCR } from '../utils/ocrCache'
 
@@ -119,26 +118,6 @@ function clearGhostText(view: EditorView): boolean {
   return true
 }
 
-function buildGhostBlockDecorations(state: any): DecorationSet | null {
-  const pluginState = COPILOT_PLUGIN_KEY.getState(state) as CopilotState | undefined
-  if (!pluginState || !pluginState.suggestion || pluginState.from >= pluginState.to) {
-    return null
-  }
-
-  const from = Math.max(0, Math.min(pluginState.from, state.doc.content.size))
-  const to = Math.max(from, Math.min(pluginState.to, state.doc.content.size))
-  const decorations: Decoration[] = []
-
-  state.doc.nodesBetween(from, to, (node: any, pos: number) => {
-    if (!node.isBlock || node.nodeSize <= 0) return true
-    decorations.push(Decoration.node(pos, pos + node.nodeSize, { class: 'copilot-ghost-block' }))
-    return true
-  })
-
-  if (decorations.length === 0) return null
-  return DecorationSet.create(state.doc, decorations)
-}
-
 function getCursorBeforeGhostInsert(tr: any, from: number): number {
   const mapped = tr.mapping.map(from, -1)
   return Math.max(0, Math.min(mapped, tr.doc.content.size))
@@ -167,9 +146,13 @@ function addGhostMarksToTextNodes(tr: any, from: number, to: number, markType: a
   tr.doc.nodesBetween(from, to, (node: any, pos: number) => {
     if (!node.isText || node.nodeSize <= 0) return true
 
-    const $pos = tr.doc.resolve(pos)
+    const start = Math.max(pos, from)
+    const end = Math.min(pos + node.nodeSize, to)
+    if (end <= start) return true
+
+    const $pos = tr.doc.resolve(start)
     if ($pos.parent.type.allowsMarkType?.(markType)) {
-      tr.addMark(pos, pos + node.nodeSize, markType.create())
+      tr.addMark(start, end, markType.create())
     }
     return true
   })
@@ -454,7 +437,6 @@ export const copilotPlugin = $prose((ctx) => new Plugin<CopilotState>({
     }
   },
   props: {
-    decorations: (state) => buildGhostBlockDecorations(state),
     handleKeyDown: (view, event) => {
       const hasGhost = hasGhostText(view)