feat: add Dev HUD & 15 Obsidian callouts; more collection filters

Dev tools
- Add HBX Dev HUD (floating button + panel) with live log viewer
- Add get-build-id helper to dedupe logs per build (during `hugo server` refreshes)

Callouts
- Implement Obsidian-compatible callouts (15+ types) with shared renderer
- Add i18n title translations (en, es, fr) for all callout types
- Deprecate `callout` shortcode with suppressible warning; keep working
- Migrate starters to Markdown callouts (>[!TYPE]) and update docs

Logging
- Centralize logging in partial `functions/logger` with info/warn/error levels
- Use fmt.Warnidf for suppressible warnings (consistent IDs)
- Only show info in Dev HUD/JSON (no longer use warnf for info logging); warn/error still printed in CLI
- Include source metadata and build ID on each entry

Blocks – Collection
- Add support for `content.filters.kinds`
- Add `content.filters.tags` (array) alongside existing `filters.tag` (string)

Build/Tailwind/JS
- Fix missing Tailwind v4 styles in Hugo render: include preact-built assets, extract classes from JSX/TSX to `@sources`
- Load Preact client per block, publish source maps in dev; on-demand Alpine

CI
- Re-implement fast fails with panicOnWarning now that info logging as warnf removed
- Fix package splitter change detection: strip trailing slashes; collapse paths to starter roots

Starters/Docs
- Restructure courses under `courses/hugo-blox/`
- Update menus and landing pages
- Replace deprecated callout usage in content and docs
- Replace missing hero icon `download` with `arrow-down-tray` in academic-cv guide

Icons
- Improve icon resolver: default pack inference, better fallback, and precise missing-icon warnings (with page ref)

.github/workflows/ci-build-starters-matrix.yml

@@ -100,4 +100,4 @@ jobs:
 
       - name: Build ${{ matrix.starter.name }}
         working-directory: ${{ matrix.starter.path }}
-        run: hugo --minify
+        run: hugo --minify --panicOnWarning

.github/workflows/ci-build-test-site.yml

@@ -98,5 +98,5 @@ jobs:
           extended: true
 
       - name: Build
-        run: hugo --minify --templateMetrics --templateMetricsHints
+        run: hugo --minify --panicOnWarning --templateMetrics --templateMetricsHints
         working-directory: test

.github/workflows/release-package-splitter.yml

@@ -83,14 +83,25 @@ jobs:
           FIRST=true
           # tj-actions outputs space-separated list
           for DIR in $CHANGED_DIRS; do
+            # Normalize potential trailing slash
+            DIR="${DIR%/}"
+
+            # Collapse to the starter root (first two path segments), e.g. starters/landing-page
+            IFS='/' read -r SEG1 SEG2 _ <<< "$DIR"
+            if [[ -n "$SEG1" && -n "$SEG2" ]]; then
+              ROOT="$SEG1/$SEG2"
+            else
+              ROOT="$DIR"
+            fi
+
             # Only process if it's a known starter
-            if [[ -n "${STARTER_MAP[$DIR]}" ]]; then
+            if [[ -n "${STARTER_MAP[$ROOT]}" ]]; then
               if [ "$FIRST" = true ]; then
                 FIRST=false
               else
-                JSON+=","
+                JSON+="," 
               fi
-              JSON+="{\"local_path\":\"$DIR\",\"split_repository\":\"${STARTER_MAP[$DIR]}\"}"
+              JSON+="{\"local_path\":\"$ROOT\",\"split_repository\":\"${STARTER_MAP[$ROOT]}\"}"
             fi
           done
           JSON+="]"