feat: add My Scripts/Team Scripts tabs and Build button to Script Library

- Add language field to ScriptTemplateListItem frontend type
- Add mine/shared params to scriptsApi.getTemplates
- Update scriptGeneratorStore.loadTemplates to accept filter params
- Reorganize ScriptLibraryPage with tab bar (My Scripts / Team Scripts)
- Add "Build a New Script" button linking to /script-builder

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/pages/ScriptLibraryPage.tsx

@@ -1,6 +1,6 @@
 import { useState, useEffect } from 'react'
 import { Link } from 'react-router-dom'
-import { Terminal, Settings } from 'lucide-react'
+import { Terminal, Settings, Wand2 } from 'lucide-react'
 import { useScriptGeneratorStore } from '@/store/scriptGeneratorStore'
 import { usePermissions } from '@/hooks/usePermissions'
 import { ScriptFilterBar } from '@/components/scripts/ScriptFilterBar'
@@ -8,10 +8,13 @@ import { ScriptTemplateList } from '@/components/scripts/ScriptTemplateList'
 import { ScriptConfigurePane } from '@/components/scripts/ScriptConfigurePane'
 import { ScriptPreview } from '@/components/scripts/ScriptPreview'
 
+type LibraryTab = 'mine' | 'team'
+
 export default function ScriptLibraryPage() {
   const [paneMode, setPaneMode] = useState<'browse' | 'configure'>('browse')
   // inputValue owned here so it survives Configure ↔ Browse transitions
   const [inputValue, setInputValue] = useState('')
+  const [activeTab, setActiveTab] = useState<LibraryTab>('mine')
 
   const loadCategories = useScriptGeneratorStore(s => s.loadCategories)
   const loadTemplates = useScriptGeneratorStore(s => s.loadTemplates)
@@ -24,8 +27,18 @@ export default function ScriptLibraryPage() {
   const canGenerate = isEngineer
 
   useEffect(() => {
-    loadCategories().then(() => loadTemplates())
-  }, [loadCategories, loadTemplates])
+    loadCategories().then(() => {
+      const filters = activeTab === 'mine' ? { mine: true } : { shared: true }
+      loadTemplates(filters)
+    })
+  }, [loadCategories, loadTemplates, activeTab])
+
+  const onTabChange = (tab: LibraryTab) => {
+    setActiveTab(tab)
+    setInputValue('')
+    setSearch('')
+    setPaneMode('browse')
+  }
 
   const onClearSearch = () => {
     setInputValue('')
@@ -42,23 +55,55 @@ export default function ScriptLibraryPage() {
     setPaneMode('browse')
   }
 
+  const tabClass = (tab: LibraryTab) =>
+    tab === activeTab
+      ? 'border-b-2 border-primary text-foreground'
+      : 'text-muted-foreground hover:text-foreground'
+
   return (
     <div className="flex flex-col gap-4 p-6 h-full">
       {/* Page header */}
-      <div>
-        <h1 className="text-2xl font-heading font-bold text-foreground">Script Library</h1>
-        <p className="text-sm text-muted-foreground mt-1">
-          Browse PowerShell templates, fill in parameters, and generate ready-to-run scripts.
-        </p>
-        {isEngineer && (
-          <Link
-            to="/scripts/manage"
-            className="inline-flex items-center gap-1.5 text-xs text-primary bg-primary/10 hover:bg-primary/15 px-2.5 py-1 rounded-full transition-colors mt-2 group"
-          >
-            <Settings size={12} className="group-hover:rotate-90 transition-transform duration-300" />
-            Manage Templates
-          </Link>
-        )}
+      <div className="flex items-start justify-between">
+        <div>
+          <h1 className="text-2xl font-heading font-bold text-foreground">Script Library</h1>
+          <p className="text-sm text-muted-foreground mt-1">
+            Browse PowerShell templates, fill in parameters, and generate ready-to-run scripts.
+          </p>
+          {isEngineer && (
+            <Link
+              to="/scripts/manage"
+              className="inline-flex items-center gap-1.5 text-xs text-primary bg-primary/10 hover:bg-primary/15 px-2.5 py-1 rounded-full transition-colors mt-2 group"
+            >
+              <Settings size={12} className="group-hover:rotate-90 transition-transform duration-300" />
+              Manage Templates
+            </Link>
+          )}
+        </div>
+        <Link
+          to="/script-builder"
+          className="inline-flex items-center gap-2 bg-gradient-brand text-[#101114] font-semibold rounded-[10px] px-4 py-2 shadow-lg shadow-primary/20 hover:opacity-90 active:scale-[0.97] transition-all"
+        >
+          <Wand2 size={16} />
+          Build a New Script
+        </Link>
+      </div>
+
+      {/* Tab bar */}
+      <div className="flex gap-6 border-b border-border">
+        <button
+          type="button"
+          onClick={() => onTabChange('mine')}
+          className={`pb-2 text-sm font-medium transition-colors ${tabClass('mine')}`}
+        >
+          My Scripts
+        </button>
+        <button
+          type="button"
+          onClick={() => onTabChange('team')}
+          className={`pb-2 text-sm font-medium transition-colors ${tabClass('team')}`}
+        >
+          Team Scripts
+        </button>
       </div>
 
       {/* Two-column layout */}