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/ai-budget.service.ts

@@ -20,7 +20,7 @@ import { logger } from '@/lib/logger';
 export type BudgetPeriod = 'day' | 'week' | 'month';
 
 export interface AiBudget {
-  /** When false, the budget is disabled — no caps enforced. */
+  /** When false, the budget is disabled - no caps enforced. */
   enabled: boolean;
   softCapTokens: number;
   hardCapTokens: number;
@@ -137,7 +137,7 @@ export async function checkBudget(args: {
   const { portId, estimatedTokens } = args;
   const budget = await readBudget(portId);
   if (!budget.enabled) {
-    // Budget is off — usage still gets logged, but no caps enforced.
+    // Budget is off - usage still gets logged, but no caps enforced.
     return { ok: true, remaining: Number.POSITIVE_INFINITY, usedTokens: 0, softCap: false };
   }
   const used = await currentPeriodTokens(portId);
@@ -177,7 +177,7 @@ interface RecordUsageInput {
   requestId?: string | null;
 }
 
-/** Insert a ledger row. Never throws — logged failures degrade silently. */
+/** Insert a ledger row. Never throws - logged failures degrade silently. */
 export async function recordAiUsage(input: RecordUsageInput): Promise<void> {
   try {
     const total = (input.inputTokens || 0) + (input.outputTokens || 0);
@@ -193,13 +193,13 @@ export async function recordAiUsage(input: RecordUsageInput): Promise<void> {
       requestId: input.requestId ?? null,
     });
   } catch (err) {
-    // Don't fail the user-facing call because the ledger write hiccuped —
+    // Don't fail the user-facing call because the ledger write hiccuped -
     // we'd rather silently lose a row than blow up an OCR scan.
     logger.error({ err, feature: input.feature }, 'recordAiUsage failed');
   }
 }
 
-/** Per-feature breakdown for the current period — feeds the admin dashboard. */
+/** Per-feature breakdown for the current period - feeds the admin dashboard. */
 export async function periodBreakdown(
   portId: string,
 ): Promise<Array<{ feature: string; tokens: number; calls: number }>> {