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).

backend/app/services/quote_service.py

@@ -346,7 +346,7 @@ async def _apply_status_transition(db: AsyncSession, quote: Quote, new_status: s
         li_ids = select(LineItem.id).where(LineItem.quote_id == quote.id)
         await db.execute(
             update(ItemDecision)
-            .where(ItemDecision.line_item_id.in_(li_ids), ItemDecision.status != "pending")
+            .where(ItemDecision.line_item_id.in_(li_ids))
             .values(
                 status="pending",
                 decided_at=None,
@@ -524,21 +524,7 @@ async def accept_quote(db: AsyncSession, quote_id: UUID, payload: AcceptQuoteIn,
                 decision.adjusted_notes = decision_in.adjusted_notes
                 decision.decided_at = utcnow()
 
-        # --- per-material project allocation (تخصیص پروژه به هر قلم) ---
-        for entry in payload.item_projects:
-            if entry.line_item_id not in li_ids:
-                raise NotFoundError(
-                    "خط آیتم یافت نشد یا متعلق به این پیشنهاد نیست", field="item_projects"
-                )
-            await db.execute(
-                delete(LineItemProjects)
-                .where(LineItemProjects.line_item_id == entry.line_item_id)
-                .execution_options(synchronize_session=False)
-            )
-            for pid in entry.project_ids:
-                if await db.get(Project, pid) is None:
-                    raise NotFoundError("پروژه یافت نشد", field="item_projects.project_ids")
-                db.add(LineItemProjects(line_item_id=entry.line_item_id, project_id=pid))
+        # LineItemProjects records in PostgreSQL remain 100% untouched. Only item_decisions.project_id is written.
 
         # termsheets referenced by at least one chosen item -> accepted
         if chosen_ts_ids: