fix: improve deployment progress UI and prevent duplicate deployment rows

- Redesign DeploymentProgress component: track-based layout with amber
  brand color, checkmarks for completed steps, user-friendly labels
  (Prepare, Image, Network, Launch, Verify, Activate, Live)
- Delete terminal (STOPPED/FAILED) deployments before creating new ones
  for the same app+environment, preventing duplicate rows in the UI
- Update CLAUDE.md with comprehensive key class locations, correct deploy
  stages, database migration reference, and REST endpoint summary

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ui/src/components/DeploymentProgress.tsx

@@ -1,13 +1,13 @@
 import styles from './DeploymentProgress.module.css';
 
 const STAGES = [
-  { key: 'PRE_FLIGHT', label: 'Pre-flight' },
-  { key: 'PULL_IMAGE', label: 'Pull' },
+  { key: 'PRE_FLIGHT', label: 'Prepare' },
+  { key: 'PULL_IMAGE', label: 'Image' },
   { key: 'CREATE_NETWORK', label: 'Network' },
-  { key: 'START_REPLICAS', label: 'Start' },
-  { key: 'HEALTH_CHECK', label: 'Health' },
-  { key: 'SWAP_TRAFFIC', label: 'Swap' },
-  { key: 'COMPLETE', label: 'Done' },
+  { key: 'START_REPLICAS', label: 'Launch' },
+  { key: 'HEALTH_CHECK', label: 'Verify' },
+  { key: 'SWAP_TRAFFIC', label: 'Activate' },
+  { key: 'COMPLETE', label: 'Live' },
 ];
 
 interface DeploymentProgressProps {
@@ -22,25 +22,48 @@ export function DeploymentProgress({ currentStage, failed }: DeploymentProgressP
 
   return (
     <div className={styles.container}>
-      {STAGES.map((stage, i) => {
-        const isCompleted = i < currentIndex;
-        const isActive = i === currentIndex && !failed;
-        const isFailed = i === currentIndex && failed;
+      <div className={styles.track}>
+        <div
+          className={`${styles.trackFill} ${failed ? styles.trackFailed : ''}`}
+          style={{ width: `${(currentIndex / (STAGES.length - 1)) * 100}%` }}
+        />
+      </div>
+      <div className={styles.steps}>
+        {STAGES.map((stage, i) => {
+          const isCompleted = i < currentIndex;
+          const isActive = i === currentIndex && !failed;
+          const isFailed = i === currentIndex && failed;
 
-        return (
-          <div key={stage.key} className={styles.step}>
-            {i > 0 && (
-              <div className={`${styles.line} ${isCompleted || isActive || isFailed ? styles.lineCompleted : ''}`} />
-            )}
-            <div className={styles.stepColumn}>
-              <div className={`${styles.dot} ${isCompleted ? styles.dotCompleted : ''} ${isActive ? styles.dotActive : ''} ${isFailed ? styles.dotFailed : ''}`} />
-              <span className={`${styles.label} ${isActive ? styles.labelActive : ''} ${isFailed ? styles.labelFailed : ''}`}>
+          return (
+            <div key={stage.key} className={styles.step}>
+              <div
+                className={[
+                  styles.dot,
+                  isCompleted ? styles.completed : '',
+                  isActive ? styles.active : '',
+                  isFailed ? styles.failed : '',
+                ].join(' ')}
+              >
+                {isCompleted && (
+                  <svg width="8" height="8" viewBox="0 0 12 12" fill="none">
+                    <path d="M2 6l3 3 5-5" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round" />
+                  </svg>
+                )}
+              </div>
+              <span
+                className={[
+                  styles.label,
+                  isCompleted ? styles.labelDone : '',
+                  isActive ? styles.labelActive : '',
+                  isFailed ? styles.labelFailed : '',
+                ].join(' ')}
+              >
                 {stage.label}
               </span>
             </div>
-          </div>
-        );
-      })}
+          );
+        })}
+      </div>
     </div>
   );
 }