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/components/interests/interest-list.tsx

@@ -71,7 +71,7 @@ export function InterestList() {
 
   const bulkArchiveMutation = useMutation({
     mutationFn: async (ids: string[]) => {
-      // Concurrent fan-out — small batches in practice (page size cap = 100).
+      // Concurrent fan-out - small batches in practice (page size cap = 100).
       // If a single delete fails the others still run; the rejected one
       // surfaces a toast via the standard apiFetch error path.
       await Promise.all(ids.map((id) => apiFetch(`/api/v1/interests/${id}`, { method: 'DELETE' })));
@@ -194,7 +194,7 @@ export function InterestList() {
         />
       )}
 
-      {/* Mobile FAB — primary "New interest" affordance for the bottom-tab UX.
+      {/* Mobile FAB - primary "New interest" affordance for the bottom-tab UX.
            Sits above the bottom nav (pb-safe-bottom + 70px tab height + 16px
            gap). Hidden on lg+ where the header button already does the job. */}
       <PermissionGate resource="interests" action="create">