feat(app): apps tab, archy mock data, prompt palette, code browser, detail keys, guide routing

- Add [[app_ext:...]] tag format and rewrite extractApps() for reliable app extraction
- Wire AppsGrid and RecipeGrid into ContentGridView (was missing on wide desktop)
- Add mock Archy node data for standalone dev testing (VITE_MOCK_ARCHY=true)
- Fix PromptPalette: z-50 + opaque bg so slash menu renders above chat content
- Fix detail banner not updating: add :key to all detail components in ContentPanel
- Guide page moved to /guide, chat is now root route, guide auto-selected on first load
- Code browser: click opens file in viewer, separate checkbox for chat context selection
- Restore folder context selector (round checkbox on hover) in FileTreeNode
- Demo projects for prod deployment instead of hardcoded personal paths
- Improve Archy context injection with media breakdown and better error logging
- Add 11 Claude Code skills for efficient development workflows

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/app/src/components/content/ContentPanel.vue

@@ -58,53 +58,63 @@
           <component
             :is="filmRenderer?.panelPlay"
             v-if="selectedFilm && filmRenderer?.panelPlay"
+            :key="selectedFilm.id"
             :film="selectedFilm"
             @back="closeFilmDetail"
           />
           <BookDetail
             v-else-if="selectedBook"
+            :key="selectedBook.id"
             :book="selectedBook"
             @back="closeBookDetail"
           />
           <TVSeriesDetail
             v-else-if="selectedTVSeries"
+            :key="selectedTVSeries.id"
             :series="selectedTVSeries"
             @back="closeTVSeriesDetail"
           />
           <component
             :is="songRenderer?.panelPlay"
             v-else-if="selectedSong && songRenderer?.panelPlay"
+            :key="selectedSong.id"
             :song="selectedSong"
             @back="closeSongDetail"
           />
           <PodcastDetail
             v-else-if="selectedPodcast"
+            :key="selectedPodcast.id"
             :podcast="selectedPodcast"
             @back="closePodcastDetail"
           />
           <ImageDetail
             v-else-if="selectedImage"
+            :key="selectedImage.url"
             :image="selectedImage"
             @back="closeImageDetail"
           />
           <PlaceDetail
             v-else-if="selectedPlace"
+            :key="selectedPlace.id"
             :place="selectedPlace"
             @back="closePlaceDetail"
           />
           <RecipeDetail
             v-else-if="selectedRecipe"
+            :key="selectedRecipe.title"
             :recipe="selectedRecipe"
             @back="closeRecipeDetail"
           />
           <AppDetail
             v-else-if="selectedApp"
+            :key="selectedApp.id"
             :app="selectedApp"
             @back="closeAppDetail"
             @select-app="openAppDetail"
           />
           <ArticleDetail
             v-else-if="selectedArticle"
+            :key="selectedArticle.url"
             :article="selectedArticle"
             @back="closeArticleDetail"
           />