refactor(web): redesign assistant management UI #3829

Job	Run time
CLI Tests (macos-15)	3m 49s
CLI Tests (ubuntu-latest)	5m 57s
Shell Deploy Scripts	9s
Frontend Build	3m 53s
Rust Build Check (ubuntu-latest)	10m 10s
Rust Build Check (macos-15)	12m 19s
Rust Build Check (windows-latest)	16m 15s
	52m 32s

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