feat(web): refine session defaults and chat affordances #6291

Job	Run time
Shell Deploy Scripts	15s
Build Impact	17s
CLI Tests (macos-15)	9m 6s
Frontend Build	9m 51s
Rust Build Check (windows-latest)	28m 12s
Rust Build Check (macos-15)	13m 7s
CLI Tests (windows-latest)	12m 16s
CLI Tests (ubuntu-latest)	10m 4s
Rust Build Check (ubuntu-latest)	15m 44s
Impact-selected Linux / Relay Contract	0s
DSH Profile Packaging (windows-latest)	0s
Rust / CLI Validation	4s
	1h 38m 56s

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