fix(wizard,quotes,dates): reliable error routing, single-project accept, Persian date/time input

Wizard:
- failed saves now route to the exact step+field: a new data-field attribute on every required section (supplier_id, line_items, termsheets, project, quote_date, expiry_date, notes, proforma) plus resolveErrorTarget() that maps ApiError.field / message keywords (supplier, line item/material/unit/quantity, termsheet/schedule/milestone, project, dates, notes, file) to the offending step — the «رفع خطا» toast action scrolls/focuses the right control instead of guessing
- material records are no longer created on the fly while typing (rememberMaterial no longer fires addMaterial per blur); materials/specs/units are written once during the final save, avoiding half-created catalog rows

Accept flow:
- quote_service no longer rewrites LineItemProjects on accept — those candidate-project rows stay 100% untouched and only item_decisions.project_id is written, matching the per-item target-project model and the UI payload (item_projects: [])

Dates/time:
- JalaliDatePicker: hour/minute are now editable text fields (Persian digits, clamping, 3-digit retype handling) with a controlled useEffect that only rewrites the inputs when the numeric value actually changes — no more wiping in-progress typing; date-only detection tightened to a full YYYY-MM-DD match so datetime strings are not misread

Also: /api validation logging (RequestValidationError) now includes the path and error list for faster diagnosis.

Verified: api + frontend image builds (python, tsc, vite) clean on top of origin/production (incl. the team's mobile layout merges).

frontend/src/lib/quoteUtils.ts

@@ -147,17 +147,10 @@ export function lineItemTotal(li: LineItem): number | null {
 // - در وضعیت accepted یا arrived: فقط تک پروژه‌ی انتخاب‌شده در خرید (item_decisions.project_id)
 export function itemProjects(q: Quote, li: LineItem): string[] {
   if (q.status === "accepted" || q.status === "arrived") {
-    if (li.target_project?.name) {
-      return [li.target_project.name];
-    }
-    // اگر target_project هنوز آبجکت نام نداشت، بررسی نام در صورت تک‌پروژه بودن
-    if (li.projects && li.projects.length === 1) {
-      const p = li.projects[0];
-      return [typeof p === "string" ? p : p.name];
-    }
-    return [];
+    return li.target_project?.name ? [li.target_project.name] : [];
   }
-  return (li.projects || []).map((p) => (typeof p === "string" ? p : p.name));
+  // For 'offered', 'rejected', 'expired': return all candidate projects
+  return (li.projects || []).map((p) => (typeof p === "string" ? p : p.name)).filter(Boolean);
 }
 
 // ---------- واحد مرجع و ضریب تبدیل ----------