refactor(workflows): rename Publish (Dev) to Preview (Dev)

Clearer naming convention:
- Preview (Dev) = deploy to dev preview site (temporary/staging)
- Publish (Live) = deploy to production (permanent/public)

Renamed files:
- tinytorch-publish-dev.yml → tinytorch-preview-dev.yml
- kits-publish-dev.yml → kits-preview-dev.yml
- labs-publish-dev.yml → labs-preview-dev.yml
- book-deploy-preview.yml → book-preview-dev.yml

Updated workflow names to use 👁️ Preview (Dev) icon/naming.

.github/workflows/book-preview-dev.yml

@@ -1,4 +1,4 @@
-name: '📚 Book · 💯 Publish (Dev)'
+name: '📚 Book · 👁️ Preview (Dev)'
 
 env:
   ARTIFACT_NAME: dev-html-linux # The name of the artifact produced by the 'validate-dev' workflow

.github/workflows/kits-build-pdfs.yml

@@ -98,4 +98,4 @@ jobs:
           echo "" >> $GITHUB_STEP_SUMMARY
           echo "To deploy with this PDF, run the appropriate publish workflow:" >> $GITHUB_STEP_SUMMARY
           echo "- **Live**: Kits Publish (Live)" >> $GITHUB_STEP_SUMMARY
-          echo "- **Dev**: Kits Publish (Dev)" >> $GITHUB_STEP_SUMMARY
+          echo "- **Dev**: Kits Preview (Dev)" >> $GITHUB_STEP_SUMMARY

.github/workflows/kits-preview-dev.yml

@@ -1,4 +1,4 @@
-name: '📦 Kits · 💯 Publish (Dev)'
+name: '📦 Kits · 👁️ Preview (Dev)'
 
 # Builds and deploys Hardware Kits site (with PDF) to dev preview
 

.github/workflows/labs-preview-dev.yml

@@ -1,4 +1,4 @@
-name: '🔮 Labs · 💯 Publish (Dev)'
+name: '🔮 Labs · 👁️ Preview (Dev)'
 
 # Builds and deploys Labs site to dev preview
 

.github/workflows/tinytorch-build-pdfs.yml

@@ -131,4 +131,4 @@ jobs:
           echo "" >> $GITHUB_STEP_SUMMARY
           echo "To deploy with these PDFs, run the appropriate publish workflow:" >> $GITHUB_STEP_SUMMARY
           echo "- **Live**: TinyTorch Publish (Live)" >> $GITHUB_STEP_SUMMARY
-          echo "- **Dev**: TinyTorch Publish (Dev)" >> $GITHUB_STEP_SUMMARY
+          echo "- **Dev**: TinyTorch Preview (Dev)" >> $GITHUB_STEP_SUMMARY

.github/workflows/tinytorch-preview-dev.yml

@@ -1,4 +1,4 @@
-name: '🔥 TinyTorch · 💯 Publish (Dev)'
+name: '🔥 TinyTorch · 👁️ Preview (Dev)'
 
 # Builds and deploys TinyTorch site to dev preview
 # Triggers after Validate (Dev) passes, builds PDFs, then deploys