refactor(electrobun): modularize stores + shared UI components
Stores:
- notifications-store.svelte.ts: owns notifications array (was inline in App)
- workspace-store.svelte.ts: extended with addProjectFromWizard, loadGroupsFromDb,
loadProjectsFromDb, derived getters (totalCost, totalTokens, mountedGroupIds)
Shared UI components (ui/):
- SegmentedControl.svelte: replaces repeated .seg button groups
- SliderInput.svelte: labeled range slider with value display
- StatusDot.svelte: colored dot with pulse support
- IconButton.svelte: icon-only button with tooltip, 3 sizes
- Section.svelte: settings section wrapper with heading
App.svelte: script 390→221 lines (removed all inline CRUD, delegates to stores)
ProjectCard: uses StatusDot shared component
AgentSettings + OrchestrationSettings: use SegmentedControl, SliderInput, Section
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