[beam] add emit on item count update

[Alchez]

No description provided.

[github-actions]

Coverage Report for ./beam

Status	Category	Percentage	Covered / Total
🔴	Lines	5.73% (🎯 70%)	7 / 122
🔴	Statements	6.1% (🎯 70%)	8 / 131
🔴	Functions	2.56% (🎯 70%)	1 / 39
🔴	Branches	0% (🎯 70%)	0 / 68

File Coverage

File	Stmts	Branches	Functions	Lines	Uncovered Lines
Changed Files
beam/src/components/ListItem.vue	0%	0%	0%	0%	27-15
beam/src/components/ListView.vue	0%	0%	0%	0%	23-2
Unchanged Files
beam/src/components/ActionFooter.vue	0%	100%	0%	0%	12-3
beam/src/components/BeamArrow.vue	0%	0%	100%	0%	2-4
beam/src/components/BeamFilter.vue	0%	0%	0%	0%	18-9
beam/src/components/BeamFilterOption.vue	0%	0%	0%	0%	41-21
beam/src/components/BeamMetadata.vue	0%	0%	0%	0%	2-1
beam/src/components/BeamModal.vue	0%	0%	0%	0%	3-5
beam/src/components/BeamModalOutlet.vue	0%	100%	100%	0%	2
beam/src/components/BeamProgress.vue	0%	0%	0%	0%	22-3
beam/src/components/Confirm.vue	0%	0%	0%	0%	4-5
beam/src/components/ItemCheck.vue	0%	0%	0%	0%	9-3
beam/src/components/ItemCount.vue	0%	0%	0%	0%	20-1
beam/src/components/ListAnchor.vue	0%	100%	100%	0%	1
beam/src/components/Navbar.vue	0%	0%	0%	0%	13-null
beam/src/components/ScanInput.vue	88.88%	100%	50%	87.5%	23
beam/src/components/SplitColumn.vue	0%	0%	100%	0%	5-8
beam/src/composables/mqtt.ts	0%	0%	0%	0%	8-40

Generated in workflow #429 for commit 7e45f30 by the Vitest Coverage Report Action