Update the stat sheet parser to scan <tspan> elements within <text>
nodes. This allows for individual binding of template patterns to
specific tspans, preserving their position attributes.
Introduces the ability to discover and render `*.sheet.svg` files.
These files can contain `<text>` elements with `${key}` templates
that reactively update based on the current journal stats.
- Add `StatSheet` type and CLI scanning logic
- Implement `SheetView` for rendering SVGs with live bindings
- Add `parseSheet` utility to extract template patterns from SVG
- Update file indexer to include `.svg` files