Move project remove confirmation from inline buttons to modal popup

Replaces the inline Yes/No confirmation with a proper ConfirmRemoveModal
dialog, consistent with other modal patterns in the app (EnvVarsModal, etc.).
Supports Escape key and overlay click to dismiss.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/src/components/projects/ConfirmRemoveModal.tsx

@@ -0,0 +1,55 @@
+import { useEffect, useRef, useCallback } from "react";
+
+interface Props {
+  projectName: string;
+  onConfirm: () => void;
+  onCancel: () => void;
+}
+
+export default function ConfirmRemoveModal({ projectName, onConfirm, onCancel }: Props) {
+  const overlayRef = useRef<HTMLDivElement>(null);
+
+  useEffect(() => {
+    const handleKeyDown = (e: KeyboardEvent) => {
+      if (e.key === "Escape") onCancel();
+    };
+    document.addEventListener("keydown", handleKeyDown);
+    return () => document.removeEventListener("keydown", handleKeyDown);
+  }, [onCancel]);
+
+  const handleOverlayClick = useCallback(
+    (e: React.MouseEvent<HTMLDivElement>) => {
+      if (e.target === overlayRef.current) onCancel();
+    },
+    [onCancel],
+  );
+
+  return (
+    <div
+      ref={overlayRef}
+      onClick={handleOverlayClick}
+      className="fixed inset-0 bg-black/50 flex items-center justify-center z-50"
+    >
+      <div className="bg-[var(--bg-secondary)] border border-[var(--border-color)] rounded-lg p-6 w-[24rem] shadow-xl">
+        <h2 className="text-lg font-semibold mb-3">Remove Project</h2>
+        <p className="text-sm text-[var(--text-secondary)] mb-5">
+          Are you sure you want to remove <strong className="text-[var(--text-primary)]">{projectName}</strong>? This will delete the container, config volume, and stored credentials.
+        </p>
+        <div className="flex justify-end gap-2">
+          <button
+            onClick={onCancel}
+            className="px-4 py-2 text-sm text-[var(--text-secondary)] hover:text-[var(--text-primary)] transition-colors"
+          >
+            Cancel
+          </button>
+          <button
+            onClick={onConfirm}
+            className="px-4 py-2 text-sm text-white bg-[var(--error)] hover:opacity-80 rounded transition-colors"
+          >
+            Remove
+          </button>
+        </div>
+      </div>
+    </div>
+  );
+}