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/pages/Wizard/Step5Review.tsx

@@ -57,20 +57,20 @@ export function Step5Review({
 
       <div className="grid max-w-2xl grid-cols-12 gap-3">
         {/* تاریخ پیشنهاد: فضای بزرگتر (۷ ستون از ۱۲) به همراه ساعت */}
-        <div className="field col-span-7 [&>div]:w-full [&_input]:w-full">
+        <div className="field col-span-7 [&>div]:w-full [&_input]:w-full" data-field="quote_date">
           <label>تاریخ پیشنهاد</label>
           <JalaliDatePicker value={quoteDate} onChange={onQuoteDate} placeholder="۱۴۰۳/۰۵/۱۲" withTime />
           <div className="hint">پیش‌فرض امروز</div>
         </div>
 
         {/* تاریخ انقضای پیشنهاد: فضای کوچکتر (۵ ستون از ۱۲) */}
-        <div className="field col-span-5 [&>div]:w-full [&_input]:w-full">
+        <div className="field col-span-5 [&>div]:w-full [&_input]:w-full" data-field="expiry_date">
           <label>تاریخ انقضای پیشنهاد</label>
           <JalaliDatePicker value={expiryDate} onChange={onExpiryDate} placeholder="۱۴۰۳/۰۶/۱۲" />
           <div className="hint">تا چه زمانی این قیمت معتبر است؟</div>
         </div>
 
-        <div className="field col-span-12">
+        <div className="field col-span-12" data-field="notes">
           <label>یادداشت (اختیاری)</label>
           <textarea
             rows={2}
@@ -81,7 +81,7 @@ export function Step5Review({
           />
         </div>
 
-        <div className="field col-span-12">
+        <div className="field col-span-12" data-field="proforma">
           <label>پیش‌فاکتور (اختیاری)</label>
           {proforma ? (
             /* وضعیت فایل انتخاب‌شده با دکمه حذف تمیز */