Fix first frame issue: Show activation output instead of empty prompt

Moved Show command to appear after source activate.sh completes,
so the first visible frame shows the activation finishing instead
of an empty prompt. This makes the recording flow more natural.

Changes:
- cd command stays hidden
- source activate.sh runs inside Hide block
- Show appears after activation completes
- First frame now shows activation output

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

docs/_static/demos/tapes/00-welcome.tape

@@ -25,15 +25,15 @@ Set TypingSpeed 100ms
 Set Shell bash
 Env PS1 "@profvjreddi 🔥 › "
 
-# Change to TinyTorch directory and activate (hidden from recording)
+# Change to TinyTorch directory and activate (cd hidden, activation shown)
 Hide
 Type "cd /Users/VJ/GitHub/TinyTorch"
 Enter
 Sleep 500ms
 Type "source activate.sh"
 Enter
-Sleep 2s
 Show
+Sleep 2s
 
 # Show the beautiful welcome screen
 Type "tito"

docs/_static/demos/tapes/02-build-test-ship.tape

@@ -25,15 +25,15 @@ Set Shell bash
 Env PS1 "@profvjreddi 🔥 › "
 Set TypingSpeed 100ms
 
-# Activate TinyTorch environment
+# Activate TinyTorch environment (cd hidden, activation shown)
 Hide
 Type "cd /Users/VJ/GitHub/TinyTorch"
 Enter
 Sleep 500ms
-Show
 Type "source activate.sh"
 Sleep 400ms
 Enter
+Show
 Sleep 2s
 
 # Start module 02

docs/_static/demos/tapes/03-milestone-unlocked.tape

@@ -25,15 +25,17 @@ Set Shell bash
 Env PS1 "@profvjreddi 🔥 › "
 Set TypingSpeed 100ms
 
-# Setup: cd, activate, and complete modules 01-06 (all hidden)
+# Setup: cd and activate (shown), then complete modules 01-06 (hidden)
 Hide
 Type "cd /Users/VJ/GitHub/TinyTorch"
 Enter
 Sleep 500ms
 Type "source activate.sh"
 Enter
+Show
 Sleep 2s
-# Complete modules 01-06 to unlock module 07 and milestone 03
+# Complete modules 01-06 to unlock module 07 and milestone 03 (hidden)
+Hide
 Type "tito module complete 01"
 Enter
 Sleep 5s

docs/_static/demos/tapes/04-share-journey.tape

@@ -25,15 +25,15 @@ Set Shell bash
 Env PS1 "@profvjreddi 🔥 › "
 Set TypingSpeed 100ms
 
-# Activate TinyTorch environment
+# Activate TinyTorch environment (cd hidden, activation shown)
 Hide
 Type "cd /Users/VJ/GitHub/TinyTorch"
 Enter
 Sleep 500ms
-Show
 Type "source activate.sh"
 Sleep 400ms
 Enter
+Show
 Sleep 2s
 
 # Check progress