[chelproc]

Extract the parts shared by the five object-specific stores (components, nodes, component pins, node pins, and connections) into a new base class CCBaseStore in src/store/base.ts. This is a first step toward a GC-like mechanism that cleans up objects whose references are gone, which needs a single place that owns the objects of every store.

CCBaseStore holds:

• the reference to the root store (#store in each store becomes the protected store)
• the map of objects (#components, #nodes, #pins, #nodePins, and #connections become the protected objects)
• get and getMany, which were identical in every store
• the abstract mount
• CCBaseStoreEvents, the didRegister, willUnregister, and didUnregister events that each store's event type now extends

register, unregister, and import stay in each store, as they still differ: unregister takes a single id in some stores and an array in others, and import bypasses register in the component pin and connection stores. No behavior changes.

Validation:

• npm run type-check
• npm run check
• npm test -- --run
• npm run build

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