intake: guard hoisted step scripts against absent DOM

Astro hoists multiple step scripts from Wizard even when the step is not
rendered on the current order page. Several steps bound DOM elements at load
time with no presence check, causing null addEventListener errors on unrelated
order pages.

Add step-presence guards to the obvious offenders used by the shared wizard:
IccImportStep, Block6CertStep, WirelessStep, BundledServiceStep, CPNIStep,
and LNPARegionStep.

site/src/components/intake/steps/Block6CertStep.astro

@@ -110,6 +110,7 @@ import DeMinimisChoiceExplainer from "../DeMinimisChoiceExplainer.astro";
 <script>
   import { NONDISCLOSURE_CERT_TEXT } from "../../../lib/fcc_constants";
 
+  if (document.querySelector('[data-slug="block6_cert"], [data-step="block6_cert"]')) {
   const exUsf = document.getElementById("pw-ex-usf") as HTMLInputElement;
   const exTrs = document.getElementById("pw-ex-trs") as HTMLInputElement;
   const exNanpa = document.getElementById("pw-ex-nanpa") as HTMLInputElement;
@@ -239,4 +240,5 @@ import DeMinimisChoiceExplainer from "../DeMinimisChoiceExplainer.astro";
       waive_deminimis_reason: election === "regular" ? (waiveReason.value.trim() || null) : null,
     });
   });
+  }
 </script>

site/src/components/intake/steps/BundledServiceStep.astro

@@ -47,6 +47,7 @@
 </style>
 
 <script>
+  if (document.querySelector('[data-slug="bundled_service"], [data-step="bundled_service"]')) {
   const hasBundle = document.getElementById("pw-bs-has-bundle") as HTMLInputElement;
   const details = document.getElementById("pw-bs-details") as HTMLElement;
   const bundleRev = document.getElementById("pw-bs-bundle-rev") as HTMLInputElement;
@@ -95,4 +96,5 @@
       } : { has_bundle: false },
     });
   });
+  }
 </script>

site/src/components/intake/steps/CPNIStep.astro

@@ -96,6 +96,7 @@
 </style>
 
 <script>
+  if (document.querySelector('[data-slug="cpni_questions"], [data-step="cpni_questions"]')) {
   const yearEl = document.getElementById("pw-cpni-year")!;
   const reportingYear = new Date().getFullYear() - 1;
   yearEl.textContent = String(reportingYear);
@@ -165,4 +166,5 @@
       });
     }
   });
+  }
 </script>

site/src/components/intake/steps/IccImportStep.astro

@@ -72,6 +72,7 @@
 </style>
 
 <script>
+  if (document.querySelector('[data-slug="icc_import"], [data-step="icc_import"]')) {
   const drop = document.getElementById("pw-icc-drop") as HTMLElement;
   const fileInput = document.getElementById("pw-icc-file") as HTMLInputElement;
   const browse = document.getElementById("pw-icc-browse") as HTMLButtonElement;
@@ -194,4 +195,5 @@
       icc_revenue_source: confirmCb.checked ? "imported" : null,
     });
   });
+  }
 </script>

site/src/components/intake/steps/LNPARegionStep.astro

@@ -61,6 +61,7 @@ import { LNPA_REGIONS } from "../../../lib/lnpa_regions_catalog";
 <script>
   import { LNPA_REGIONS } from "../../../lib/lnpa_regions_catalog";
 
+  if (document.querySelector('[data-slug="lnpa_region"], [data-step="lnpa_region"]')) {
   const body = document.getElementById("pw-lnpa-body")!;
   const b3Sum = document.getElementById("pw-lnpa-b3-sum")!;
   const b4Sum = document.getElementById("pw-lnpa-b4-sum")!;
@@ -173,4 +174,5 @@ import { LNPA_REGIONS } from "../../../lib/lnpa_regions_catalog";
       }).catch(() => {});
     }
   });
+  }
 </script>

site/src/components/intake/steps/WirelessStep.astro

@@ -62,6 +62,7 @@
 </style>
 
 <script>
+  if (document.querySelector('[data-slug="wireless"], [data-step="wireless"]')) {
   const infra = document.getElementById("pw-wl-infra") as HTMLSelectElement;
   const mvnoWrap = document.getElementById("pw-wl-mvno-wrap") as HTMLElement;
   const facWrap = document.getElementById("pw-wl-fac-wrap") as HTMLElement;
@@ -109,4 +110,5 @@
     };
     PW.patchIntakeData({ wireless_meta: meta });
   });
+  }
 </script>