fix: RTL stepper connectors and duplicate clock icon in session wizard

SessionStepper copied MUI's LTR connector offsets (left: -50%), which in
the RTL admin drew each connector away from its previous step — a stray
line ran off the card edge past the last step and the first two steps
had no line between them. Swap the offsets so connectors extend toward
the previous step on the right, matching tauri's MUI-flipped rendering.

The acceptance-time field showed two clock icons (custom ClockP + the
browser's native picker indicator); hide the native one like the tauri
source, which has a single ClockField adornment.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

assets/admin/components/SessionStepper.tsx

@@ -41,12 +41,13 @@ export default function SessionStepper({ activeStep = 0, steps = [] }: { activeS
     <div style={{ display: 'flex', alignItems: 'flex-start', width: '100%', marginBottom: 24 }}>
       {steps.map((label, i) => (
         <div key={label} style={{ flex: 1, display: 'flex', flexDirection: 'column', alignItems: 'center', position: 'relative' }}>
-          {/* connector to previous step (tauri ColorlibConnector: top 22, h 3, marginX 40) */}
+          {/* connector to previous step (tauri ColorlibConnector: top 22, h 3, marginX 40).
+              صفحه RTL است و گامِ قبلی سمت راست می‌افتد؛ MUI در tauri این را خودش flip می‌کرد. */}
           {i > 0 && (
             <div
               data-testid={`step-connector-${i}`}
               style={{
-                position: 'absolute', top: 22, right: 'calc(50% + 40px)', left: 'calc(-50% + 40px)',
+                position: 'absolute', top: 22, left: 'calc(50% + 40px)', right: 'calc(-50% + 40px)',
                 height: 3, borderRadius: 1,
                 background: i <= activeStep ? 'linear-gradient(95deg, #5559ce 0%, #5559ce 100%)' : '#eaeaf0',
               }}