fix(pda): make completed loading evidence read-only

tests/seal-save-idempotency.test.mjs

@@ -5,7 +5,7 @@ import { readFile } from 'node:fs/promises'
 const page = await readFile(new URL('../pages/picking/picking.vue', import.meta.url), 'utf8')
 
 test('saving a seal is single-flight and submits the pending photo through the atomic evidence command', () => {
-	assert.match(page, /:disabled="sealSaving \|\| !sealReadyToSave"/)
+	assert.match(page, /:disabled="evidenceReadOnly \|\| sealSaving \|\| !sealReadyToSave"/)
 	assert.match(page, /sealSaving \? '上传中…' : '保存并上传'/)
 	assert.match(page, /async saveSealNo\(\) \{[\s\S]*?if \(this\.sealSaving\) return/)
 	assert.match(page, /find\(\(item\) => item\.localPath && !item\.id\)/)