fix(harmonyos): preserve repeated chat messages #5218

Job	Run time
DSH Profile Packaging (windows-latest)	48s
Shell Deploy Scripts	12s
Frontend Build	6m 47s
Rust Build Check (windows-latest)	22m 7s
CLI Tests (macos-15)	9m 44s
Rust Build Check (macos-15)	16m 23s
CLI Tests (ubuntu-latest)	10m 26s
Rust Build Check (ubuntu-latest)	11m 13s
	1h 17m 40s

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