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Fix short mobile conversations aligning to bottom #7013

Job	Run time
Build Impact	20s
Shell Deploy Scripts	19s
CLI Tests (macos-15)	10m 40s
Rust Build Check (macos-15)	23m 34s
Rust Build Check (ubuntu-latest)	17m 54s
Rust Build Check (windows-latest)	23m 15s
CLI Tests (ubuntu-latest)	9m 25s
Frontend Build	13m 32s
CLI Tests (windows-latest)	11m 13s
DSH Profile Packaging (windows-latest)	-1s
Impact-selected Linux / Relay Contract	-1s
Rust / CLI Validation	9s
	1h 50m 19s