fix(terminal): start precision (#3078)

* fix(executor): use performance.now() for precise block timing

Replace Date.now() with performance.now() for timing measurements in
the executor to provide sub-millisecond precision. This fixes timing
discrepancies with fast-executing blocks like the start block where
millisecond precision was insufficient.

Changes:
- block-executor.ts: Use performance.now() for block execution timing
- engine.ts: Use performance.now() for overall execution timing

Co-authored-by: emir <emir@simstudio.ai>

* format ms as whole nums,round secs to 2 decimal places and compute all started/ended times on server and passback to clinet

---------

Co-authored-by: Cursor Agent <cursoragent@cursor.com>
Co-authored-by: waleed <walif6@gmail.com>

apps/sim/app/api/workflows/[id]/execute/route.ts

@@ -616,6 +616,8 @@ export async function POST(req: NextRequest, { params }: { params: Promise<{ id:
                   input: callbackData.input,
                   error: callbackData.output.error,
                   durationMs: callbackData.executionTime || 0,
+                  startedAt: callbackData.startedAt,
+                  endedAt: callbackData.endedAt,
                   ...(iterationContext && {
                     iterationCurrent: iterationContext.iterationCurrent,
                     iterationTotal: iterationContext.iterationTotal,
@@ -641,6 +643,8 @@ export async function POST(req: NextRequest, { params }: { params: Promise<{ id:
                   input: callbackData.input,
                   output: callbackData.output,
                   durationMs: callbackData.executionTime || 0,
+                  startedAt: callbackData.startedAt,
+                  endedAt: callbackData.endedAt,
                   ...(iterationContext && {
                     iterationCurrent: iterationContext.iterationCurrent,
                     iterationTotal: iterationContext.iterationTotal,