feat(webapp): completing spans server-side no longer write-after-read, improving efficiency and perf #3528

Job	Run time
typecheck / typecheck	5m 21s
e2e / 🧪 CLI v3 tests (windows-latest - pnpm)	4m 53s
e2e / 🧪 CLI v3 tests (ubuntu-latest - pnpm)	2m 20s
e2e / 🧪 CLI v3 tests (windows-latest - npm)	4m 57s
units / internal / 🧪 Unit Tests: Internal (1, 8)	5m 11s
units / internal / 🧪 Unit Tests: Internal (2, 8)	4m 40s
e2e / 🧪 CLI v3 tests (ubuntu-latest - npm)	2m 23s
units / internal / 🧪 Unit Tests: Internal (4, 8)	4m 25s
units / internal / 🧪 Unit Tests: Internal (7, 8)	3m 59s
units / internal / 🧪 Unit Tests: Internal (6, 8)	3m 14s
units / internal / 🧪 Unit Tests: Internal (8, 8)	1m 46s
units / packages / 🧪 Unit Tests: Packages (1, 1)	3m 26s
units / internal / 🧪 Unit Tests: Internal (3, 8)	3m 58s
units / webapp / 🧪 Unit Tests: Webapp (1, 8)	5m 20s
units / webapp / 🧪 Unit Tests: Webapp (6, 8)	7m 3s
units / webapp / 🧪 Unit Tests: Webapp (5, 8)	2m 42s
units / webapp / 🧪 Unit Tests: Webapp (2, 8)	3m 17s
units / webapp / 🧪 Unit Tests: Webapp (7, 8)	2m 1s
units / webapp / 🧪 Unit Tests: Webapp (3, 8)	2m 37s
units / webapp / 🧪 Unit Tests: Webapp (4, 8)	5m 15s
units / internal / 🧪 Unit Tests: Internal (5, 8)	4m 14s
units / webapp / 🧪 Unit Tests: Webapp (8, 8)	5m 33s
units / packages / 📊 Merge Reports	21s
units / internal / 📊 Merge Reports	26s
units / webapp / 📊 Merge Reports	41s
	1h 30m 3s

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