chore(style): codebase em-dash sweep + minor layout polish

Replaces every em-dash and en-dash with regular ASCII hyphens
across comments, JSX strings, and dev-facing logs. Mostly cosmetic
but stops the inconsistent mix that crept in over the last few
months (some files used em-dashes in comments, others didn't,
some used both).

Bundles two small dashboard-layout tweaks that touch a couple of
already-modified files:
- (dashboard)/layout.tsx main padding goes from p-6 to pt-3 px-6
  pb-6 so page content sits closer to the topbar.
- Sidebar now receives the ports list it needs for the footer
  port switcher.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/lib/services/custom-fields.service.ts

@@ -89,7 +89,7 @@ export async function createDefinition(
     .returning();
 
   const created = rows[0];
-  if (!created) throw new Error('Insert failed — no row returned');
+  if (!created) throw new Error('Insert failed - no row returned');
 
   void createAuditLog({
     userId,
@@ -117,7 +117,7 @@ export async function updateDefinition(
   data: UpdateFieldInput & { fieldType?: unknown },
   meta: AuditMeta,
 ) {
-  // Immutability guard — fieldType must never change
+  // Immutability guard - fieldType must never change
   if ('fieldType' in data && data.fieldType !== undefined) {
     throw new ValidationError('Field type cannot be changed after creation');
   }
@@ -141,7 +141,7 @@ export async function updateDefinition(
     .returning();
 
   const updated = updateRows[0];
-  if (!updated) throw new Error('Update failed — no row returned');
+  if (!updated) throw new Error('Update failed - no row returned');
 
   void createAuditLog({
     userId,
@@ -188,7 +188,7 @@ export async function deleteDefinition(
     .where(eq(customFieldValues.fieldId, fieldId));
   const valueCount = countResult[0]?.count ?? 0;
 
-  // Delete definition — CASCADE handles values
+  // Delete definition - CASCADE handles values
   await db.delete(customFieldDefinitions).where(eq(customFieldDefinitions.id, fieldId));
 
   void createAuditLog({
@@ -269,7 +269,7 @@ export async function setValues(
   // Tenant scope: verify entityId actually points at a port-scoped row of
   // the entity type the field definitions target. Without this gate, any
   // authenticated user could write custom-field rows pointing at arbitrary
-  // entityIds (or none at all) — polluting customFieldValues and creating
+  // entityIds (or none at all) - polluting customFieldValues and creating
   // a join surface that could later leak data.
   const entityTypes = new Set(
     values