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/executor/orchestrators/loop.ts

@@ -281,9 +281,12 @@ export class LoopOrchestrator {
 
     // Emit onBlockComplete for the loop container so the UI can track it
     if (this.contextExtensions?.onBlockComplete) {
+      const now = new Date().toISOString()
       this.contextExtensions.onBlockComplete(loopId, 'Loop', 'loop', {
         output,
         executionTime: DEFAULTS.EXECUTION_TIME,
+        startedAt: now,
+        endedAt: now,
       })
     }
 

apps/sim/executor/orchestrators/parallel.ts

@@ -265,9 +265,12 @@ export class ParallelOrchestrator {
 
     // Emit onBlockComplete for the parallel container so the UI can track it
     if (this.contextExtensions?.onBlockComplete) {
+      const now = new Date().toISOString()
       this.contextExtensions.onBlockComplete(parallelId, 'Parallel', 'parallel', {
         output,
         executionTime: 0,
+        startedAt: now,
+        endedAt: now,
       })
     }