add VHS-generated GIFs for all examples

Created tape files and GIFs demonstrating each example:
- counter, timer, list, spinner, views, http
- Updated README with GIF showcase

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

assets/counter.tape

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+# Counter Example
+Output assets/counter.gif
+
+Set Shell "bash"
+Set FontSize 16
+Set Width 600
+Set Height 400
+Set Theme "Catppuccin Mocha"
+
+Type "bb counter"
+Enter
+Sleep 1s
+
+# Increment a few times
+Type "k"
+Sleep 400ms
+Type "k"
+Sleep 400ms
+Type "k"
+Sleep 400ms
+Type "k"
+Sleep 400ms
+Type "k"
+Sleep 600ms
+
+# Decrement
+Type "j"
+Sleep 400ms
+Type "j"
+Sleep 400ms
+Type "j"
+Sleep 600ms
+
+# Reset
+Type "r"
+Sleep 800ms
+
+# Go negative
+Type "j"
+Sleep 400ms
+Type "j"
+Sleep 400ms
+Type "j"
+Sleep 600ms
+
+# Quit
+Type "q"
+Sleep 500ms

assets/http.tape

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+# HTTP Example
+Output assets/http.gif
+
+Set Shell "bash"
+Set FontSize 16
+Set Width 650
+Set Height 400
+Set Theme "Catppuccin Mocha"
+
+Type "bb http"
+Enter
+Sleep 1s
+
+# Start fetch
+Enter
+Sleep 2s
+
+# Reset
+Type "r"
+Sleep 800ms
+
+# Fetch again
+Enter
+Sleep 2s
+
+# Quit
+Type "q"
+Sleep 500ms

assets/list.tape

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+# List Selection Example
+Output assets/list.gif
+
+Set Shell "bash"
+Set FontSize 16
+Set Width 700
+Set Height 500
+Set Theme "Catppuccin Mocha"
+
+Type "bb list"
+Enter
+Sleep 1s
+
+# Navigate down and select
+Type "j"
+Sleep 300ms
+Type " "
+Sleep 400ms
+
+Type "j"
+Sleep 300ms
+Type "j"
+Sleep 300ms
+Type " "
+Sleep 400ms
+
+Type "j"
+Sleep 300ms
+Type "j"
+Sleep 300ms
+Type " "
+Sleep 400ms
+
+# Navigate up
+Type "k"
+Sleep 300ms
+Type "k"
+Sleep 300ms
+
+# Deselect
+Type " "
+Sleep 400ms
+
+# Navigate and select more
+Type "j"
+Sleep 300ms
+Type "j"
+Sleep 300ms
+Type "j"
+Sleep 300ms
+Type " "
+Sleep 600ms
+
+# Submit
+Enter
+Sleep 1s

assets/spinner.tape

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+# Spinner Example
+Output assets/spinner.gif
+
+Set Shell "bash"
+Set FontSize 16
+Set Width 650
+Set Height 400
+Set Theme "Catppuccin Mocha"
+
+Type "bb spinner"
+Enter
+Sleep 1.5s
+
+# Watch spinner animate
+Sleep 1s
+
+# Change style
+Tab
+Sleep 1s
+Tab
+Sleep 1s
+Tab
+Sleep 1s
+Tab
+Sleep 1s
+
+# Complete
+Type " "
+Sleep 800ms
+
+# Restart
+Type "r"
+Sleep 1.5s
+
+# Change style again
+Tab
+Sleep 1s
+
+# Quit
+Type "q"
+Sleep 500ms

assets/timer.tape

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+# Timer Example
+Output assets/timer.gif
+
+Set Shell "bash"
+Set FontSize 16
+Set Width 600
+Set Height 400
+Set Theme "Catppuccin Mocha"
+
+Type "bb timer"
+Enter
+Sleep 1s
+
+# Watch countdown
+Sleep 2s
+
+# Pause
+Type " "
+Sleep 1s
+
+# Resume
+Type " "
+Sleep 2s
+
+# Reset
+Type "r"
+Sleep 3s
+
+# Quit
+Type "q"
+Sleep 500ms

assets/views.tape

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+# Views Example
+Output assets/views.gif
+
+Set Shell "bash"
+Set FontSize 16
+Set Width 700
+Set Height 450
+Set Theme "Catppuccin Mocha"
+
+Type "bb views"
+Enter
+Sleep 1s
+
+# Navigate menu
+Type "j"
+Sleep 400ms
+Type "j"
+Sleep 400ms
+
+# Enter detail view
+Enter
+Sleep 1s
+
+# Go back
+Type "b"
+Sleep 600ms
+
+# Navigate to another item
+Type "j"
+Sleep 400ms
+Enter
+Sleep 1s
+
+# Try to quit - shows confirm dialog
+Type "q"
+Sleep 800ms
+
+# Say no
+Type "n"
+Sleep 600ms
+
+# Go back to menu
+Escape
+Sleep 600ms
+
+# Actually quit
+Type "q"
+Sleep 500ms