defaultShapeTools

The tools that *place a shape*: one entry per built-in shape type that has a tool of its own.

Split out from defaultTools so an app can register the canvas tools and its own shape tools without inheriting ours:

``ts tools: [...defaultTools, ...defaultShapeTools, SectionTool] ``

defaultTools still contains these as well, so that spread names each tool twice. That is deliberate and safe — a tool is registered under its id, so a repeated constructor replaces its own earlier entry rather than adding a second one — and it keeps every existing tools: defaultTools working unchanged.