Update react_on_rails_pro and shakapacker to stable releases, gitignore napkin.md

Switch from release candidates to stable versions:
- react_on_rails_pro: 16.6.0.rc.1 → 16.6.0
- shakapacker: 10.0.0.rc.1 → 10.0.0
Add napkin.md to .gitignore.

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

Author: justin808

.gitignore

@@ -72,3 +72,4 @@ client/app/bundles/comments/rescript/**/*.bs.js
 !.claude/commands/
 !.claude/commands/address-review.md
 .context/
+napkin.md

Gemfile

@@ -5,8 +5,8 @@ git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 
 ruby "3.4.6"
 
-gem "react_on_rails_pro", "16.6.0.rc.1"
-gem "shakapacker", "10.0.0.rc.1"
+gem "react_on_rails_pro", "16.6.0"
+gem "shakapacker", "10.0.0"
 
 # Bundle edge Rails instead: gem "rails", github: "rails/rails"
 gem "rails", "~> 8.1.2"

Gemfile.lock

@@ -317,14 +317,14 @@ GEM
       erb
       psych (>= 4.0.0)
       tsort
-    react_on_rails (16.6.0.rc.1)
+    react_on_rails (16.6.0)
       addressable
       connection_pool
       execjs (~> 2.5)
       rails (>= 5.2)
       rainbow (~> 3.0)
       shakapacker (>= 6.0)
-    react_on_rails_pro (16.6.0.rc.1)
+    react_on_rails_pro (16.6.0)
       addressable
       async (>= 2.29)
       connection_pool
@@ -333,7 +333,7 @@ GEM
       httpx (~> 1.5)
       jwt (~> 2.7)
       rainbow
-      react_on_rails (= 16.6.0.rc.1)
+      react_on_rails (= 16.6.0)
     redcarpet (3.6.0)
     redis (5.3.0)
       redis-client (>= 0.22.0)
@@ -418,7 +418,7 @@ GEM
       websocket (~> 1.0)
     semantic_range (3.1.1)
     sexp_processor (4.17.1)
-    shakapacker (10.0.0.rc.1)
+    shakapacker (10.0.0)
       activesupport (>= 5.2)
       package_json
       rack-proxy (>= 0.6.1)
@@ -518,7 +518,7 @@ DEPENDENCIES
   rails-html-sanitizer
   rails_best_practices
   rainbow
-  react_on_rails_pro (= 16.6.0.rc.1)
+  react_on_rails_pro (= 16.6.0)
   redcarpet
   redis (~> 5.0)
   rspec-rails (~> 6.0.0)
@@ -530,7 +530,7 @@ DEPENDENCIES
   scss_lint
   sdoc
   selenium-webdriver (~> 4)
-  shakapacker (= 10.0.0.rc.1)
+  shakapacker (= 10.0.0)
   spring
   spring-commands-rspec
   stimulus-rails (~> 1.3)