feat(monaco,codemirror): add Storybook demos with sample prompts

[yesudeep]

Summary

This PR adds Storybook.js integration to both the Monaco Editor and CodeMirror editor packages, along with comprehensive sample prompts that exercise all Dotprompt features.

Changes

Storybook Integration

• Added Storybook v10 to both @dotprompt/monaco and @dotprompt/codemirror packages
• 17+ stories per package organized by features and display variants
• Editor modes: Standard, Vim, and Emacs (CodeMirror only) keybindings
• Dynamic sample selector dropdown in Controls panel

Sample Prompts (11 comprehensive examples)

Sample	Feature Demonstrated
01-basic.prompt	Minimal frontmatter with model and simple conditionals
02-schema-and-config.prompt	Config options, Picoschema with optional fields/enums, JSON output
03-multimodal-media.prompt	Media helper for images and audio with array iteration
04-tools.prompt	Tools array with detailed system instructions
05-handlebars-helpers.prompt	if/else/unless, each with @index/@first/@last, with, nested conditionals
06-partials.prompt	Partial inclusion, hash parameters, partial blocks
07-multi-turn-history.prompt	History helper for conversation memory
08-sections-thinking.prompt	Section helper for Chain-of-Thought reasoning
09-complex-schema.prompt	Deeply nested JSON Schema definitions
10-kitchen-sink.prompt	ALL features combined - comprehensive example
11-multilingual-unicode.prompt	CJK, Arabic, Cyrillic, Thai, emoji, and special characters

Editor Keybinding Modes

• Standard: Default editing mode
• Vim: Vi keybindings via monaco-vim / @replit/codemirror-vim
• Emacs: Emacs keybindings via @replit/codemirror-emacs (CodeMirror only)

GitHub-Ready Package Pattern

• @dotprompt/monaco and @dotprompt/codemirror now have dist/ checked in
• Enables direct GitHub installation without requiring a build step:

  pnpm add @dotprompt/monaco@github:google/dotprompt#path:/packages/monaco
  pnpm add @dotprompt/codemirror@github:google/dotprompt#path:/packages/codemirror

pnpm Workspace Configuration

• Added public-hoist-pattern for Storybook packages in root .npmrc
• Maintains hoist=false for Bazel compatibility while allowing Storybook to resolve correctly

Running Storybook

# Monaco editor stories (port 6006)
pnpm -C packages/monaco storybook

# CodeMirror editor stories
pnpm -C packages/codemirror storybook

Screenshots

The Storybook demos include:

• Syntax highlighting for YAML frontmatter and Handlebars templates
• Vim/Emacs mode status indicators
• Sample selector dropdown to switch between prompt examples
• Theme toggling (dark/light)
• Feature toggles (line numbers, word wrap, read-only, etc.)

Testing

• Verified both Monaco and CodeMirror Storybooks start and render correctly
• Confirmed sample loading and switching works via the Controls panel
• Confirmed Vim and Emacs mode keybindings work in CodeMirror
• Confirmed Vim mode works in Monaco