Add optimistic send UX — spinner while sending, red ! on failure with… #1669

Job	Run time
Unit Tests (macOS)	2m 26s
Embedding Integration Tests	40s
Secret Scan (gitleaks)	10s
Typecheck	53s
Lint	37s
Unit Tests (Node 24)	2m 26s
Unit Tests (Windows ConPTY)	1m 18s
Unit Tests (Windows)	1m 20s
Server Unit Tests	1m 6s
Web Tests (Unit)	57s
Web Tests (Components)	50s
Server DB Integration Tests	1m 5s
Unit Tests (Node 22)	2m 30s
Repo Provider Integration Tests	45s
E2E Tests	54s
Coverage Report	7m 47s
Docker Build & Push	1m 28s
Android Release Build	4m 6s
Publish to npm	3m 52s
	35m 10s

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