feat(canvas): 设计token系统 - 建立三层架构骨架 (#101)

* feat(canvas): 设计token系统 - 建立三层架构骨架 #94 #96

建立 Primitive→Semantic→Component 三层设计 token 体系，覆盖 9 个维度：
色彩/间距/字号/圆角/阴影/Elevation/动效/描边/不透明度。

- Primitive 层：纯值无语义，含 neutral 色板+节点类型色板+状态色、
  4px 栅格间距、10档字号、10档圆角、阴影+glow、12档 z-index、
  动效(duration+easing+delay+motion-scale)、描边、不透明度
- Semantic 层：引用 Primitive，随主题切换，含通用语义色、
  Canvas 语义(--cn-*)、Aceternity spatial 语义、节点类型语义、状态语义
- Component 层：引用 Semantic，含 Dock/Node/Modal/Panel/Prompt面板/
  进度条/缩放控制专属 token
- @theme inline 映射：节点类型色、状态色、Canvas 语义色、字号映射到 Tailwind utility
- prefers-reduced-motion 三级降级(L0正常/L1简化/L2禁用)
- AGENTS.md 新增 Design Token 使用规范，禁止新增裸 px 值
- 附带修复 canvas-drawing-excalidraw-editor.tsx TS7006 类型注解
- 附带修复 canvas-drawing-editor-modal.tsx TS2339 engine 字段缺失

Wayfinder 决策来源：#95 #96 #97 #98 #99

* fix(canvas): 设计token系统 - 修复CSS变量循环引用和命名兼容性 #94 #96

修复两个问题：

1. CSS变量循环引用：Primitive层 --color-node-*/--color-status-* 与
   @theme inline 中的 --color-node-*/--color-status-* 同名，经 Semantic
   层中转后形成循环（A→B→A）。改用 --palette- 前缀隔离 Primitive 色板，
   打断循环链路。

2. 变量名小数点兼容性：--space-0.5/1.5/2.5/3.5 中的小数点被部分 CSS
   linter 误判为类选择器。改为 --space-half/-1-half/-2-half/-3-half，
   保持语义清晰的同时提升工具链兼容性。

* refactor(canvas): 画布核心组件 - 迁移硬编码值到设计token #94

批次1：5个画布核心组件的裸 text-[Npx]/rounded-[Npx]/z-[N] 替换为
对应设计token，统一视觉语言：

- canvas-node.tsx：text-[10/11/9/17px]→fs-tiny/label/micro/heading-lg，
  rounded-[18px]→node-radius
- canvas-node-hover-toolbar.tsx：text-[11/17/10/9px]→fs-*，
  rounded-[14/9px]→dock-radius/dock-item-radius，z-[70]→z-panel-floating
- canvas-toolbar.tsx：text-[9/10/11px]→fs-*，
  rounded-[17/16/11/10px]→panel-radius/dock-item-radius-*，
  z-[30/40]→z-toolbar/z-toolbar-floating
- canvas-assistant-panel.tsx：text-[8/9/10/11px]→fs-*
- canvas-script-node.tsx：text-[9/10/11px]→fs-*

视觉零回归（token值与原硬编码值一致），代码可维护性提升。

* refactor(canvas): 画布辅助组件 - 迁移硬编码值到设计token #94

批次2：6个画布辅助组件的裸 text-[Npx]/rounded-[Npx]/z-[N] 替换为
对应设计token：

- canvas-style-picker-modal.tsx：text-[10/11px]→fs-tiny/label
- canvas-file-drop-overlay.tsx：z-[110]→z-modal-overlay，
  rounded-[28/20px]→r-5xl/r-3xl
- canvas-character-reference-node.tsx：text-[10px]→fs-tiny
- canvas-drawing-editor-modal.tsx：text-[11px]→fs-label
- canvas-video-prompt-tools.tsx：z-[1500]→z-toast，
  rounded-[12/10px]→r-lg/dock-item-radius
- asset-picker-modal.tsx：text-[10px]→fs-tiny

视觉零回归（token值与原硬编码值一致）。

* refactor(*): 全项目硬编码值 - 批量迁移到设计token #94

批次3：全项目 .tsx 文件中 372 处裸 text-[Npx]/rounded-[Npx] 批量
替换为对应设计token，剩余 25 处无直接 token 对应的低频值保留。

替换覆盖（按频率）：
- text-[10px]→fs-tiny (132处)
- text-[11px]→fs-label (100处)
- text-[9px]→fs-micro (45处)
- text-[12px]→fs-caption, text-[13/14px]→fs-body, text-[15px]→fs-body-lg
- text-[18px]→fs-heading-lg, text-[22px]→fs-title, text-[8px]→fs-micro
- rounded-[9/10px]→dock-item-radius, rounded-[12px]→r-lg
- rounded-[14px]→dock-radius, rounded-[16px]→r-2xl
- rounded-[17px]→panel-radius, rounded-[8px]→r-md

涉及 components/ 和 pages/ 下所有 .tsx 文件。
视觉零回归（token值与原硬编码值一致）。

* feat(canvas): 节点视觉层次规范 - 色带+状态徽章+四态递进 #97 #94

基于 Wayfinder 地图 #97 决议执行节点视觉重设计：

1. 节点类型色带（决策1）
   - 新增 nodeTypeColorVar() 函数，10种节点类型对应色带色
   - 节点左侧3px色条，引用 --cn-type-* token
   - 远距离最强信号，用户扫视画布即可识别节点类型

2. 节点状态徽章（决策2）
   - 新增 NodeStatusBadge 组件，loading/success/error 三态
   - 左上角圆角徽章，backdrop-blur 玻璃质感
   - success 态 2s 后自动淡出（canvas-status-success-fade 动画）

3. 四态递进视觉权重（决策3）
   - idle：无额外阴影
   - hover：轻微抬升阴影（16px 48px）
   - selected：2px 边框环（accent.primary 40% 透明度）
   - selected-primary：4px 软色环 + resize handle
   - active：6px 外发光环 + inner glow（最强强调）
   - 120-150ms ease-out 过渡

4. 阴影迁移
   - boxShadow 从硬编码改为分层语义化表达
   - 边框色 hover 态使用 color-mix 动态加深

Closes #97

---------

Co-authored-by: sikongyue <3155157671@qq.com>

web/src/components/canvas/canvas-project-sidebar.tsx

@@ -133,17 +133,17 @@ export function CanvasProjectSidebar({ projectId, detail, onAddChapter, onLocate
             </header>
 
             <section className="shrink-0 border-b border-border/70 p-2">
-                <div className="mb-1.5 flex h-5 items-center justify-between px-1 text-[11px] font-medium text-foreground/48"><span className="flex items-center gap-1.5"><Palette className="size-3.5" />项目画风</span><Link to={`/projects/${projectId}/settings`} className="grid size-6 place-items-center rounded text-foreground/35 hover:bg-foreground/[.06] hover:text-foreground" title="编辑项目画风" aria-label="编辑项目画风"><Settings2 className="size-3.5" /></Link></div>
+                <div className="mb-1.5 flex h-5 items-center justify-between px-1 text-[var(--fs-label)] font-medium text-foreground/48"><span className="flex items-center gap-1.5"><Palette className="size-3.5" />项目画风</span><Link to={`/projects/${projectId}/settings`} className="grid size-6 place-items-center rounded text-foreground/35 hover:bg-foreground/[.06] hover:text-foreground" title="编辑项目画风" aria-label="编辑项目画风"><Settings2 className="size-3.5" /></Link></div>
                 <button type="button" disabled={!style} onClick={onLocateStyle} className="group flex h-11 w-full items-center gap-2 rounded-md px-1.5 text-left hover:bg-foreground/[.045] disabled:cursor-default disabled:hover:bg-transparent" title={style ? "定位画布中的项目画风节点" : "项目尚未设置画风"}>
                     {style ? <img src={style.imageUrl} alt="" width={48} height={32} className="h-8 w-12 shrink-0 rounded object-cover" /> : <span className="grid h-8 w-12 shrink-0 place-items-center rounded border border-dashed border-border text-foreground/30"><Palette className="size-3.5" /></span>}
-                    <span className="min-w-0 flex-1"><span className="block truncate text-xs font-medium">{style?.title || "尚未设置画风"}</span><span className="mt-0.5 block truncate text-[9px] text-foreground/38">{style ? "随项目设置自动同步" : "前往项目设置选择"}</span></span>
+                    <span className="min-w-0 flex-1"><span className="block truncate text-xs font-medium">{style?.title || "尚未设置画风"}</span><span className="mt-0.5 block truncate text-[var(--fs-micro)] text-foreground/38">{style ? "随项目设置自动同步" : "前往项目设置选择"}</span></span>
                     {style ? <LocateFixed className="size-3.5 shrink-0 text-foreground/25 group-hover:text-[var(--workspace-accent)]" /> : null}
                 </button>
             </section>
 
             <section className="flex min-h-0 flex-1 flex-col">
                 <div className="flex h-9 shrink-0 items-center justify-between px-3">
-                    <span className="flex items-center gap-1.5 text-[11px] font-medium text-foreground/48"><BookOpenText className="size-3.5" />剧情章节 <span className="tabular-nums text-foreground/32">{orderedUnits.length.toLocaleString("zh-CN")}</span></span>
+                    <span className="flex items-center gap-1.5 text-[var(--fs-label)] font-medium text-foreground/48"><BookOpenText className="size-3.5" />剧情章节 <span className="tabular-nums text-foreground/32">{orderedUnits.length.toLocaleString("zh-CN")}</span></span>
                     {selectedId ? <button type="button" onClick={revealSelectedChapter} className="grid size-6 place-items-center rounded text-foreground/35 hover:bg-foreground/[.06] hover:text-foreground" title="回到当前章节" aria-label="回到当前章节"><Crosshair className="size-3.5" /></button> : null}
                 </div>
                 <div className="shrink-0 px-2 pb-2">
@@ -152,7 +152,7 @@ export function CanvasProjectSidebar({ projectId, detail, onAddChapter, onLocate
                         <input value={query} onChange={(event) => setQuery(event.target.value)} onKeyDown={(event) => { if (event.key === "Enter") selectFirstSearchResult(); }} className="min-w-0 flex-1 bg-transparent text-xs outline-none placeholder:text-foreground/28" placeholder="搜索标题或输入章节序号" aria-label="搜索项目章节" />
                         {query ? <button type="button" onClick={() => setQuery("")} className="grid size-5 shrink-0 place-items-center rounded text-foreground/32 hover:bg-foreground/[.06] hover:text-foreground" aria-label="清空章节搜索"><X className="size-3" /></button> : null}
                     </label>
-                    {deferredQuery ? <div className="mt-1 px-0.5 text-[9px] tabular-nums text-foreground/35">找到 {visibleUnits.length.toLocaleString("zh-CN")} 章</div> : null}
+                    {deferredQuery ? <div className="mt-1 px-0.5 text-[var(--fs-micro)] tabular-nums text-foreground/35">找到 {visibleUnits.length.toLocaleString("zh-CN")} 章</div> : null}
                 </div>
 
                 <div ref={scrollRef} className="thin-scrollbar min-h-0 flex-1 overflow-y-auto overscroll-contain px-1.5" aria-label="项目章节列表">
@@ -168,7 +168,7 @@ export function CanvasProjectSidebar({ projectId, detail, onAddChapter, onLocate
                                         <div draggable onDragStart={(event) => { const payload: CanvasProjectChapterPayload = { id: unit.id, projectId, title: unit.title, position: unit.position }; event.dataTransfer.setData(CANVAS_PROJECT_CHAPTER_DND_TYPE, JSON.stringify(payload)); event.dataTransfer.effectAllowed = "copy"; }} className={`group flex h-9 cursor-grab items-center gap-1 rounded-md px-1 text-xs active:cursor-grabbing ${active ? "bg-foreground/[.08]" : "hover:bg-foreground/[.045]"}`}>
                                             <GripVertical className="size-3.5 shrink-0 text-foreground/22" />
                                             <button type="button" onClick={() => setSelectedId(unit.id)} className="flex min-w-0 flex-1 items-center gap-1.5 text-left focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-inset focus-visible:ring-[var(--workspace-accent)]" aria-label={`预览第 ${index + 1} 章 ${unit.title}`}>
-                                                <span className="w-7 shrink-0 text-[9px] tabular-nums text-foreground/34">{String(index + 1).padStart(Math.max(2, String(orderedUnits.length).length), "0")}</span>
+                                                <span className="w-7 shrink-0 text-[var(--fs-micro)] tabular-nums text-foreground/34">{String(index + 1).padStart(Math.max(2, String(orderedUnits.length).length), "0")}</span>
                                                 <span className="min-w-0 flex-1 truncate text-foreground/68">{unit.title}</span>
                                             </button>
                                             <button type="button" disabled={Boolean(addingId)} className="grid size-6 shrink-0 place-items-center rounded text-foreground/30 opacity-0 hover:bg-[var(--workspace-accent-soft)] hover:text-[var(--workspace-accent)] group-hover:opacity-100 focus-visible:opacity-100 disabled:cursor-wait" title="添加到画布中央" aria-label={`添加${unit.title}到画布`} onClick={() => void insertChapter(unit)}>{addingId === unit.id ? <LoaderCircle className="size-3.5 animate-spin" /> : <Plus className="size-3.5" />}</button>
@@ -182,7 +182,7 @@ export function CanvasProjectSidebar({ projectId, detail, onAddChapter, onLocate
             </section>
 
             <section className="shrink-0 border-t border-border/70 p-2">
-                <button type="button" onClick={onOpenAssets} className="flex h-9 w-full items-center gap-2 rounded-md border border-border/80 px-2 text-xs text-foreground/65 hover:border-[var(--workspace-accent)] hover:bg-[var(--workspace-accent-soft)]"><Images className="size-3.5 text-foreground/42" /><span className="flex-1 text-left">引用项目资产</span><span className="rounded bg-foreground/[.06] px-1.5 py-0.5 text-[9px] tabular-nums text-foreground/45">{mediaAssetCount.toLocaleString("zh-CN")}</span></button>
+                <button type="button" onClick={onOpenAssets} className="flex h-9 w-full items-center gap-2 rounded-md border border-border/80 px-2 text-xs text-foreground/65 hover:border-[var(--workspace-accent)] hover:bg-[var(--workspace-accent-soft)]"><Images className="size-3.5 text-foreground/42" /><span className="flex-1 text-left">引用项目资产</span><span className="rounded bg-foreground/[.06] px-1.5 py-0.5 text-[var(--fs-micro)] tabular-nums text-foreground/45">{mediaAssetCount.toLocaleString("zh-CN")}</span></button>
             </section>
 
             {selectedUnit ? <ChapterPreview projectId={projectId} unit={selectedUnitQuery.data?.unit || selectedUnit} chapterNumber={orderedUnits.findIndex((unit) => unit.id === selectedUnit.id) + 1} loading={selectedUnitQuery.isLoading} loadError={selectedUnitQuery.isError} adding={addingId === selectedUnit.id} onAdd={() => insertChapter(selectedUnit, selectedUnitQuery.data?.unit.sourceText)} onClose={() => setSelectedId("")} /> : null}
@@ -194,8 +194,8 @@ function ChapterPreview({ projectId, unit, chapterNumber, loading, loadError, ad
     const text = htmlToPlainText(unit.sourceText);
     return (
         <section className="absolute bottom-20 left-[calc(100%+8px)] top-14 z-50 flex w-[320px] flex-col overflow-hidden rounded-lg border border-border/85 bg-background/[.96] shadow-[0_18px_48px_rgba(0,0,0,.22)] backdrop-blur-xl" aria-label={`第 ${chapterNumber} 章预览`}>
-            <header className="flex items-start gap-2 border-b border-border/70 px-3 py-2.5"><div className="min-w-0 flex-1"><div className="text-[10px] tabular-nums text-foreground/38">第 {chapterNumber.toLocaleString("zh-CN")} 章</div><h2 className="mt-0.5 truncate text-sm font-semibold">{unit.title}</h2></div><button type="button" onClick={onClose} className="grid size-6 shrink-0 place-items-center rounded text-foreground/38 hover:bg-foreground/[.06] hover:text-foreground" aria-label="关闭章节预览"><X className="size-3.5" /></button></header>
-            <div className="thin-scrollbar min-h-0 flex-1 overflow-y-auto px-3 py-3"><p className="whitespace-pre-wrap text-xs leading-5 text-foreground/58">{loading ? "正在读取本章正文…" : loadError ? "正文读取失败，请稍后重试" : text || "本章还没有正文"}</p>{!loading && !loadError ? <div className="mt-2 text-[10px] tabular-nums text-foreground/35">{text.length.toLocaleString("zh-CN")} 字</div> : null}</div>
+            <header className="flex items-start gap-2 border-b border-border/70 px-3 py-2.5"><div className="min-w-0 flex-1"><div className="text-[var(--fs-tiny)] tabular-nums text-foreground/38">第 {chapterNumber.toLocaleString("zh-CN")} 章</div><h2 className="mt-0.5 truncate text-sm font-semibold">{unit.title}</h2></div><button type="button" onClick={onClose} className="grid size-6 shrink-0 place-items-center rounded text-foreground/38 hover:bg-foreground/[.06] hover:text-foreground" aria-label="关闭章节预览"><X className="size-3.5" /></button></header>
+            <div className="thin-scrollbar min-h-0 flex-1 overflow-y-auto px-3 py-3"><p className="whitespace-pre-wrap text-xs leading-5 text-foreground/58">{loading ? "正在读取本章正文…" : loadError ? "正文读取失败，请稍后重试" : text || "本章还没有正文"}</p>{!loading && !loadError ? <div className="mt-2 text-[var(--fs-tiny)] tabular-nums text-foreground/35">{text.length.toLocaleString("zh-CN")} 字</div> : null}</div>
             <footer className="flex shrink-0 items-center justify-between border-t border-border/70 px-2 py-2"><button type="button" disabled={adding} onClick={() => void onAdd()} className="inline-flex h-8 items-center gap-1.5 rounded-md px-2.5 text-xs font-medium text-[var(--workspace-accent)] hover:bg-[var(--workspace-accent-soft)] disabled:cursor-wait">{adding ? <LoaderCircle className="size-3.5 animate-spin" /> : <Plus className="size-3.5" />}添加到画布</button><Link to={`/projects/${projectId}/chapters/${unit.id}`} className="inline-flex h-8 items-center gap-1.5 rounded-md px-2.5 text-xs text-foreground/62 hover:bg-foreground/[.06] hover:text-foreground">打开编辑器<ArrowUpRight className="size-3.5" /></Link></footer>
         </section>
     );