feat(gui): Add Fired toggle and quick filters to EventFilter (#486)

[amiable-dev]

Summary

• Add independent "⚡ Fired" toggle button for mapping_fired event visibility in EventFilter
• Add quick filter buttons: All / Raw Only / Fired Only for common filter presets
• Add 'fired' type filter value in events store to support "Fired Only" mode (hides raw events)
• Fix state consistency: toggling off Fired while in "Fired Only" mode resets type filter to prevent empty event list

Closes #486

Test plan

• 15 EventFilter component tests (type chips, fired toggle, quick filters, state consistency)
• 1 new store-level test for 'fired' type filter value
• 53 total events store tests pass
• Council verified: accuracy 10/10, no blocking issues

🤖 Generated with Claude Code

[Copilot]

Pull request overview

Adds “Fired” visibility controls to the GUI EventFilter, including quick presets, by extending the events store to support a fired-only mode and updating component/store tests accordingly.

Changes:

• Add independent “⚡ Fired” toggle plus “All / Raw Only / Fired Only” quick-filter buttons in EventFilter.
• Extend filteredEvents to support eventTypeFilter === 'fired' (hide raw events, show only mapping_fired).
• Add/expand tests for the new filter behaviors (component + store).

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
conductor-gui/ui/src/lib/stores/events.js	Adds eventTypeFilter === 'fired' handling to hide raw events in “Fired Only” mode.
conductor-gui/ui/src/lib/stores/events.test.ts	Adds store-level test asserting raw events are hidden when type filter is fired.
conductor-gui/ui/src/lib/components/EventFilter.svelte	Adds Fired toggle UI, quick filters, and state-consistency behavior.
conductor-gui/ui/src/lib/components/EventFilter.test.ts	Adds comprehensive component tests for fired toggle, quick filters, and consistency rules.

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[Copilot]

Introducing eventTypeFilter === 'fired' adds a new valid filter value, but the eventTypeFilter store’s doc comment earlier in this file still lists only 'all' | 'cc' | 'note' | 'bend' | 'aftertouch'. Update that documentation to include 'fired' so the store’s public contract stays accurate.

[Copilot]

EventFilter now imports eventFiredFilter from $lib/stores/events.js. Several existing Vitest mocks of that module (e.g. EventStreamPanel.test.ts) don’t export eventFiredFilter, which will cause runtime import errors when those tests render components that include EventFilter. Update those mocks to include an eventFiredFilter writable store (and reset it in test cleanup as needed).

Suggested change

	import { eventTypeFilter, eventFiredFilter } from '$lib/stores/events.js';
	import * as events from '$lib/stores/events.js';
	import { writable } from 'svelte/store';
	const eventTypeFilter = events.eventTypeFilter;
	const eventFiredFilter = events.eventFiredFilter ?? writable(true);