feat(ui): quick status-action chip menus on offers/orders/projects; ProjectDetail transition buttons

- NEW shared StatusChipMenu: clickable status chip opens a dense menu of valid
  next states; picks confirm via the shared ConfirmDialog (danger variant,
  loading, stays open on failure); plain chip without edit permission;
  row-click-safe (stopPropagation both directions).
- Offers list: draft -> Aktivovat (number assignment noted, PDF archived after
  finalize like the detail); active -> 'Vytvořit objednávku…' (opens the
  existing create-order modal — 'ordered' stays owned by that flow) +
  Zneplatnit; ordered -> Zneplatnit.
- ReceivedOrders list: Zahájit realizaci / Dokončit / Stornovat / Obnovit with
  cascade notes; Czech quote pairs fixed („…“); OrderDetail transition button
  says 'Obnovit' when reopening.
- Projects list + ProjectDetail: status combobox replaced by transition
  buttons (Dokončit/Zrušit/Obnovit projekt) rendered from valid_transitions;
  cascade notes only when a linked order will actually change; save no longer
  carries status; busy states symmetric.

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

src/admin/components/StatusChipMenu.tsx

@@ -0,0 +1,148 @@
+import { useState, type ComponentProps } from "react";
+import Menu from "@mui/material/Menu";
+import MenuItem from "@mui/material/MenuItem";
+import { StatusChip, ConfirmDialog } from "../ui";
+
+/** One entry in a {@link StatusChipMenu}. */
+export interface StatusChipAction {
+  /** Stable identifier, e.g. the target status. */
+  key: string;
+  /** Menu item text, e.g. "Dokončit". */
+  label: string;
+  /** Red menu-item text + danger ConfirmDialog variant. */
+  danger?: boolean;
+  /**
+   * Confirmation dialog content. When omitted the action fires directly from
+   * the menu without confirmation (used by "Vytvořit objednávku…", which
+   * opens its own modal).
+   */
+  confirm?: { title: string; message: string; confirmText: string };
+  /**
+   * Executed on pick (after confirmation when `confirm` is set). Awaited:
+   * while pending the ConfirmDialog shows its loading state and cannot be
+   * closed; on resolve the dialog closes; on rejection it stays open (the
+   * caller is responsible for toasting the error).
+   */
+  onAction: () => void | Promise<void>;
+}
+
+interface StatusChipMenuProps {
+  /** Chip text (current status label). */
+  label: string;
+  /** Chip color, same palette as {@link StatusChip}. */
+  color: ComponentProps<typeof StatusChip>["color"];
+  /** Quick actions. Empty/undefined renders a plain non-clickable chip. */
+  actions?: StatusChipAction[];
+  /** Force a plain chip (e.g. the user lacks the edit permission). */
+  disabled?: boolean;
+  /** Tooltip on the clickable chip. */
+  title?: string;
+}
+
+/**
+ * Status chip with a quick-action menu, shared by the list pages
+ * (offers / received orders / projects).
+ *
+ * Clicking the chip (stopPropagation, so row navigation never fires) opens a
+ * dense MUI Menu of the valid next actions. Picking one closes the menu and
+ * either fires `onAction` directly (no `confirm` given) or opens the single
+ * shared ConfirmDialog instance — danger variant for destructive actions,
+ * `loading` while the awaited `onAction` is pending, staying open when it
+ * rejects per app convention (the caller toasts errors).
+ *
+ * With no actions — or with `disabled` — it renders a plain non-clickable
+ * StatusChip without a tooltip.
+ */
+export default function StatusChipMenu({
+  label,
+  color,
+  actions,
+  disabled = false,
+  title = "Změnit stav",
+}: StatusChipMenuProps) {
+  const [anchorEl, setAnchorEl] = useState<HTMLElement | null>(null);
+  const [pending, setPending] = useState<StatusChipAction | null>(null);
+  const [loading, setLoading] = useState(false);
+
+  if (disabled || !actions || actions.length === 0) {
+    return <StatusChip label={label} color={color} />;
+  }
+
+  const handlePick = (action: StatusChipAction) => {
+    setAnchorEl(null);
+    if (action.confirm) {
+      setPending(action);
+    } else {
+      void (async () => {
+        try {
+          await action.onAction();
+        } catch {
+          // Expected: the caller toasts its own errors; nothing to close here.
+        }
+      })();
+    }
+  };
+
+  const handleConfirm = async () => {
+    if (!pending) return;
+    setLoading(true);
+    try {
+      await pending.onAction();
+      // Success → close; ConfirmDialog freezes its content through the fade.
+      setPending(null);
+    } catch {
+      // Expected: rejection keeps the dialog open; the caller toasts the error.
+    } finally {
+      setLoading(false);
+    }
+  };
+
+  return (
+    <>
+      <StatusChip
+        label={label}
+        color={color}
+        title={title}
+        aria-haspopup="menu"
+        aria-expanded={Boolean(anchorEl)}
+        onClick={(e) => {
+          e.stopPropagation();
+          setAnchorEl(e.currentTarget);
+        }}
+      />
+      <Menu
+        anchorEl={anchorEl}
+        open={Boolean(anchorEl)}
+        onClose={() => setAnchorEl(null)}
+        anchorOrigin={{ vertical: "bottom", horizontal: "left" }}
+        transformOrigin={{ vertical: "top", horizontal: "left" }}
+        slotProps={{ list: { dense: true } }}
+      >
+        {actions.map((action) => (
+          <MenuItem
+            key={action.key}
+            // stopPropagation: MUI portals re-bubble synthetic events to
+            // React-tree ancestors — a future onRowClick row must not fire.
+            onClick={(e) => {
+              e.stopPropagation();
+              handlePick(action);
+            }}
+            sx={action.danger ? { color: "error.main" } : undefined}
+          >
+            {action.label}
+          </MenuItem>
+        ))}
+      </Menu>
+      <ConfirmDialog
+        isOpen={pending !== null}
+        onClose={() => setPending(null)}
+        onConfirm={() => void handleConfirm()}
+        title={pending?.confirm?.title ?? ""}
+        message={pending?.confirm?.message ?? ""}
+        confirmText={pending?.confirm?.confirmText}
+        confirmVariant={pending?.danger ? "danger" : "primary"}
+        loading={loading}
+      />
+    </>
+  );
+}