feat(portal-shell): clean widget design tokens and fix lint:tokens (P1-6)

516 mechanical replacements across 25 widget files:
- spacing xs/sm/md/lg/xl to numeric 1/2/3/4/6
- text-heading-3 to text-lg font-semibold
- bg-danger to bg-destructive
- border border dedup

Fix .eslintrc.tokens.js to use typescript-eslint parser (was importing
uninstalled @typescript-eslint/parser). lint:tokens now passes.

apps/portal-shell/src/widgets/sidebar/child-selector/index.tsx

@@ -1,4 +1,4 @@
-"use client";
+"use client";
 
 /**
  * child-selector（sidebar / side）
@@ -39,7 +39,7 @@ export default function ChildSelector(_props: PluginProps): React.ReactElement {
       <select
         value={currentChildId}
         onChange={(e) => handleSelect(e.target.value)}
-        className="mt-xs w-full rounded-md border border bg-card px-sm py-xs text-sm text-foreground"
+        className="mt-1 w-full rounded-md border bg-card px-2 py-1 text-sm text-foreground"
         aria-label="选择孩子"
       >
         <option value="">请选择孩子</option>
@@ -50,7 +50,7 @@ export default function ChildSelector(_props: PluginProps): React.ReactElement {
         ))}
       </select>
       {current ? (
-        <p className="mt-xs text-xs text-muted-foreground">
+        <p className="mt-1 text-xs text-muted-foreground">
           {current.grade} · {current.className}
         </p>
       ) : null}

apps/portal-shell/src/widgets/sidebar/class-selector/index.tsx

@@ -1,4 +1,4 @@
-"use client";
+"use client";
 
 /**
  * class-selector（sidebar / side）
@@ -38,7 +38,7 @@ export default function ClassSelector(_props: PluginProps): React.ReactElement {
       <select
         value={currentClassId}
         onChange={(e) => handleSelect(e.target.value)}
-        className="mt-xs w-full rounded-md border border bg-card px-sm py-xs text-sm text-foreground"
+        className="mt-1 w-full rounded-md border bg-card px-2 py-1 text-sm text-foreground"
         aria-label="选择班级"
       >
         <option value="">请选择班级</option>

apps/portal-shell/src/widgets/sidebar/quick-actions/index.tsx

@@ -1,4 +1,4 @@
-"use client";
+"use client";
 
 /**
  * quick-actions（sidebar / side）
@@ -45,13 +45,13 @@ export default function QuickActions(props: PluginProps): React.ReactElement {
   return (
     <div>
       <p className="text-sm text-muted-foreground">快捷操作</p>
-      <ul className="mt-xs space-y-sm">
+      <ul className="mt-1 space-y-2">
         {actions.map((item) => (
           <li key={item.path}>
             <button
               type="button"
               onClick={() => handleClick(item.path)}
-              className="w-full rounded-md border border bg-card px-sm py-xs text-left text-sm text-foreground"
+              className="w-full rounded-md border bg-card px-2 py-1 text-left text-sm text-foreground"
             >
               {item.label}
             </button>

apps/portal-shell/src/widgets/sidebar/term-switcher/index.tsx

@@ -1,4 +1,4 @@
-"use client";
+"use client";
 
 /**
  * term-switcher（sidebar / side）
@@ -42,7 +42,7 @@ export default function TermSwitcher(_props: PluginProps): React.ReactElement {
       <select
         value={selectedTermId}
         onChange={(e) => handleSelect(e.target.value)}
-        className="mt-xs w-full rounded-md border border bg-card px-sm py-xs text-sm text-foreground"
+        className="mt-1 w-full rounded-md border bg-card px-2 py-1 text-sm text-foreground"
         aria-label="选择学期"
       >
         <option value="">请选择学期</option>