fix(pda): enforce sealed pallet contract and deduplicate activation refresh

tests/picking-refresh-route.test.mjs

@@ -4,6 +4,42 @@ import { readFile } from 'node:fs/promises'
 
 const read = (path) => readFile(new URL(path, import.meta.url), 'utf8')
 
+test('duplicate onShow shares one load chain while background return refreshes again', async () => {
+	const page = await read('../pages/picking/picking.vue')
+	const show = page.match(/async onShow\(\) \{[\s\S]*?\r?\n\t\t\},/)?.[0]
+	const hide = page.match(/onHide\(\) \{[\s\S]*?\r?\n\t\t\},/)?.[0]
+	assert.ok(show && hide)
+	const hooks = new Function('requireSession', 'session', `return ({${show}${hide}})`)(() => true, { currentUser: { id: '7' } })
+	const calls = []
+	let release
+	const pending = new Promise((resolve) => { release = resolve })
+	const context = { startHardwareScanner() {}, stopHardwareScanner() {}, async refreshAvailableBoxes() { calls.push('pending'); await pending }, async syncRemoteTask() { calls.push('detail+evidence') } }
+	const first = hooks.onShow.call(context)
+	const duplicate = hooks.onShow.call(context)
+	assert.deepEqual(calls, ['pending'])
+	release()
+	await Promise.all([first, duplicate])
+	assert.deepEqual(calls, ['pending', 'detail+evidence'])
+	await hooks.onShow.call(context)
+	assert.equal(calls.length, 2)
+	hooks.onHide.call(context)
+	await hooks.onShow.call(context)
+	assert.deepEqual(calls, ['pending', 'detail+evidence', 'pending', 'detail+evidence'])
+	const onLoad = page.match(/onLoad\(options = \{\}\) \{[\s\S]*?\r?\n\t\t\},/)?.[0]
+	assert.doesNotMatch(onLoad, /refreshAvailableBoxes|syncRemoteTask/)
+})
+
+test('camera and evidence preview resume still avoid unnecessary refreshes', async () => {
+	const page = await read('../pages/picking/picking.vue')
+	const show = page.match(/async onShow\(\) \{[\s\S]*?\r?\n\t\t\},/)?.[0]
+	const hooks = new Function('requireSession', 'session', `return ({${show}})`)(() => true, { currentUser: {} })
+	for (const flag of ['cameraPicking', 'evidencePreviewReturning']) {
+		const context = { [flag]: true, startHardwareScanner() {}, debugEvidence() {}, refreshAvailableBoxes() { throw new Error('unexpected refresh') } }
+		await hooks.onShow.call(context)
+		assert.equal(context._pageVisible, true)
+	}
+})
+
 test('direct H5 refresh restores the page user before rendering picking content', async () => {
 	const page = await read('../pages/picking/picking.vue')