SEV-362: format v0.2.0 — boundary spacing, acronyms, formatRange, numeric budget

- formatLabel: letter→digit boundary spacing ("level2" → "Level 2"),
  acronym casing (DCFC/EV/SUV/VIN/DC/A\C), bare numeric ranges pass
  through untouched
- new formatRange: "150-200" → "150–200 mi", "200-plus"/"200+" →
  "200+ mi"; empty → '' (callers render their own placeholder)
- formatBudget is now the numeric (min, max) dollar formatter matching
  the API payload; the wizard's slug map moves to formatBudgetBucket
- new vehicleName({year, make, model, commissioned})

Breaking rename of formatBudget is safe: no frontend consumes 0.1.0.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@switchev/web-shared",
-  "version": "0.1.0",
+  "version": "0.2.0",
   "description": "Shared browser helpers (formatters, markdown, image polling) for the SwitchEV frontends",
   "type": "module",
   "exports": {