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/store/scriptGeneratorStore.ts

@@ -30,7 +30,7 @@ interface ScriptGeneratorState {
 
   // Actions
   loadCategories: () => Promise<void>
-  loadTemplates: () => Promise<void>
+  loadTemplates: (filters?: { mine?: boolean; shared?: boolean }) => Promise<void>
   selectTemplate: (id: string) => Promise<void>
   setCategory: (id: string | null) => void
   setSearch: (query: string) => void
@@ -67,14 +67,16 @@ export const useScriptGeneratorStore = create<ScriptGeneratorState>()((set, get)
     }
   },
 
-  loadTemplates: async () => {
+  loadTemplates: async (filters) => {
     set({ isLoadingTemplates: true })
     try {
       const { activeCategoryId, categories, searchQuery } = get()
       const category = categories.find(c => c.id === activeCategoryId)
-      const params: { category_slug?: string; search?: string } = {}
+      const params: { category_slug?: string; search?: string; mine?: boolean; shared?: boolean } = {}
       if (category) params.category_slug = category.slug
       if (searchQuery) params.search = searchQuery
+      if (filters?.mine) params.mine = true
+      if (filters?.shared) params.shared = true
       const templates = await scriptsApi.getTemplates(params)
       set({ templates, isLoadingTemplates: false })
     } catch {