Update starter pack message to clarify users joined Bluesky

Change "used this starter pack" to "joined Bluesky via this starter
pack" for clearer messaging. Also add notes to CLAUDE.md that intl
extract/compile commands should not be run manually.

https://claude.ai/code/session_01UW2STvfNShaXXhu47c2tWg

CLAUDE.md

@@ -29,8 +29,9 @@ yarn lint               # Run ESLint
 yarn typecheck          # Run TypeScript type checking
 
 # Internationalization
-yarn intl:extract       # Extract translation strings (you don't typically need to run this manually, we have CI for it)
-yarn intl:compile       # Compile translations for runtime
+# DO NOT run these commands - extraction and compilation are handled by CI
+yarn intl:extract       # Extract translation strings (nightly CI job)
+yarn intl:compile       # Compile translations for runtime (nightly CI job)
 
 # Build
 yarn build-web          # Build web version
@@ -299,8 +300,9 @@ function MyComponent() {
 
 **Commands:**
 ```bash
+# DO NOT run these commands - extraction and compilation are handled by a nightly CI job
 yarn intl:extract    # Extract new strings to locale files
-yarn intl:compile    # Compile for runtime (required after changes)
+yarn intl:compile    # Compile translations for runtime
 ```
 
 ## State Management

src/screens/StarterPack/StarterPackScreen.tsx

@@ -501,7 +501,7 @@ function Header({
                     value={starterPack.joinedAllTimeCount || 0}
                     other="# people have"
                   />{' '}
-                  used this starter pack!
+                  joined Bluesky via this starter pack!
                 </Trans>
               </Text>
             </View>