Implement styles

CLAUDE.md

@@ -25,18 +25,23 @@ Ezdoc is a Ruby gem for creating .docx files using a DSL. The gem generates vali
 
 - **Document** (`lib/ezdoc/document.rb`): Entry point via `Document.create`. Includes the Builder module and maintains a collection of nodes.
 
-- **Builder** (`lib/ezdoc/builder.rb`): DSL methods (`p`, `text`, `b`, `i`, `u`, `ul`, `ol`, `li`, `table`, `tr`, `td`). Uses a format stack for nested formatting and target tracking for content placement.
+- **Builder** (`lib/ezdoc/builder.rb`): DSL methods (`p`, `text`, `h1`-`h6`, `b`, `i`, `u`, `ul`, `ol`, `li`, `table`, `tr`, `td`, `image`). Uses a format stack for nested formatting and target tracking for content placement.
 
-- **Nodes** (`lib/ezdoc/nodes/`): Document element representations (Paragraph, Run, List, ListItem, Table, TableRow, TableCell). All inherit from `Nodes::Base`.
+- **Nodes** (`lib/ezdoc/nodes/`): Document element representations (Paragraph, Run, Image, List, ListItem, Table, TableRow, TableCell). All inherit from `Nodes::Base`.
+
+- **Style** (`lib/ezdoc/style.rb`): Style definitions with text properties (bold, italic, color, size, font) and paragraph properties (align, indent, spacing).
 
 - **Package** (`lib/ezdoc/package.rb`): Assembles the docx ZIP structure using rubyzip. Coordinates XML generation.
 
 - **XML generators** (`lib/ezdoc/xml/`): Generate OOXML-compliant XML:
-  - `DocumentXml`: Main content with paragraphs, lists, tables
+  - `DocumentXml`: Main content with paragraphs, lists, tables, images
+  - `StylesXml`: styles.xml with built-in and custom styles
   - `ContentTypes`: [Content_Types].xml
   - `Relationships`: .rels files
   - `Numbering`: numbering.xml for lists
 
+- **ImageDimensions** (`lib/ezdoc/image_dimensions.rb`): Uses fastimage gem to read image dimensions for EMU calculations.
+
 ### Data Flow
 
 1. User calls DSL methods on Document