feat(sub12b): OWL Rack Parts sub-dialog (Task 12)

Mirrors screens 7-8. Searchable empty-rack picker with debounced
typeahead via /fp/tablet/rack/list_empty. QR Scan button prompts
operator for FP-RACK:<name> token, resolves via /fp/tablet/rack/
scan_qr.

Save commits the racking via /fp/tablet/rack_parts/commit. Save+Print
opens /web/report/pdf/fp.rack.travel/<id> in a new tab — that report
ships in Sub 12c, returns 404 until then. Plain Save works today.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

fusion_plating/fusion_plating_shopfloor/static/src/js/rack_parts_dialog.js

@@ -0,0 +1,90 @@
+/** @odoo-module */
+/*
+ * Sub 12b — Rack Parts sub-dialog (OWL).
+ *
+ * Mirrors Steelhead screens 7-8. Searchable empty-rack picker,
+ * QR-scan input, Unit + Amount fields. Save assigns the step → rack;
+ * Save + Print also opens the rack travel ticket PDF (Sub 12c).
+ */
+
+import { Component, onWillStart, useState } from "@odoo/owl";
+import { Dialog } from "@web/core/dialog/dialog";
+import { rpc } from "@web/core/network/rpc";
+import { useService } from "@web/core/utils/hooks";
+import { _t } from "@web/core/l10n/translation";
+
+
+export class FpRackPartsDialog extends Component {
+    static template = "fusion_plating_shopfloor.FpRackPartsDialog";
+    static components = { Dialog };
+    static props = ["fromStepId", "qty", "onRacked?", "close"];
+
+    setup() {
+        this.notification = useService("notification");
+        this.state = useState({
+            racks: [],
+            search: "",
+            selectedRackId: false,
+            unit: "Count",
+            amount: this.props.qty || 0,
+            saving: false,
+        });
+        onWillStart(async () => {
+            await this.refreshRacks("");
+        });
+    }
+
+    async refreshRacks(query) {
+        const data = await rpc("/fp/tablet/rack/list_empty", { query });
+        if (data.ok) {
+            this.state.racks = data.racks;
+        }
+    }
+
+    async onSearch(ev) {
+        this.state.search = ev.target.value;
+        await this.refreshRacks(this.state.search);
+    }
+
+    async onScan() {
+        const code = window.prompt(_t("Scan or type FP-RACK:<name>:"));
+        if (!code) return;
+        const data = await rpc("/fp/tablet/rack/scan_qr", { qr_code: code });
+        if (data.ok) {
+            this.state.selectedRackId = data.rack_id;
+            this.notification.add(
+                _t("Selected %s", data.rack_name), { type: "success" });
+        } else {
+            this.notification.add(data.error, { type: "danger" });
+        }
+    }
+
+    async onSave(printAfter) {
+        if (!this.state.selectedRackId) return;
+        this.state.saving = true;
+        const result = await rpc("/fp/tablet/rack_parts/commit", {
+            from_step_id: this.props.fromStepId,
+            rack_id: this.state.selectedRackId,
+            qty: this.state.amount,
+        });
+        if (result.ok) {
+            this.notification.add(
+                _t("Racked onto %s", result.rack_name),
+                { type: "success" });
+            if (this.props.onRacked) {
+                this.props.onRacked(result);
+            }
+            this.props.close();
+            if (printAfter) {
+                // Sub 12c report — until it ships, this returns 404.
+                window.open(
+                    `/web/report/pdf/fp.rack.travel/${this.state.selectedRackId}`,
+                    "_blank",
+                );
+            }
+        } else {
+            this.notification.add(result.error, { type: "danger" });
+            this.state.saving = false;
+        }
+    }
+}

fusion_plating/fusion_plating_shopfloor/static/src/xml/rack_parts_dialog.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<templates xml:space="preserve">
+
+<t t-name="fusion_plating_shopfloor.FpRackPartsDialog">
+    <Dialog title.translate="Rack Parts" size="'md'">
+        <div class="o_fp_rack_dialog">
+
+            <div class="o_fp_move_field">
+                <label>To Rack</label>
+                <input type="text" placeholder="Search racks…"
+                       t-on-input="onSearch" t-att-value="state.search"/>
+                <button class="btn btn-sm btn-secondary"
+                        t-on-click="onScan">
+                    QR Scan
+                </button>
+            </div>
+
+            <div class="o_fp_move_field">
+                <label/>
+                <select t-model.number="state.selectedRackId">
+                    <option value="">— Select empty rack —</option>
+                    <t t-foreach="state.racks" t-as="r" t-key="r.id">
+                        <option t-att-value="r.id">
+                            <t t-esc="r.name"/> (<t t-esc="r.rack_type"/>)
+                        </option>
+                    </t>
+                </select>
+                <span/>
+            </div>
+
+            <div class="o_fp_move_field">
+                <label>Unit</label>
+                <select t-model="state.unit">
+                    <option value="Count">Count</option>
+                    <option value="Pieces">Pieces</option>
+                    <option value="Lbs">Lbs</option>
+                    <option value="Kg">Kg</option>
+                </select>
+                <span/>
+            </div>
+
+            <div class="o_fp_move_field">
+                <label>Amount</label>
+                <input type="number" t-model.number="state.amount"/>
+                <span class="text-muted" t-esc="state.unit"/>
+            </div>
+        </div>
+
+        <t t-set-slot="footer">
+            <button class="btn btn-secondary" t-on-click="props.close">
+                Cancel
+            </button>
+            <button class="btn btn-primary"
+                    t-att-disabled="!state.selectedRackId or state.saving"
+                    t-on-click="() => this.onSave(false)">
+                Save
+            </button>
+            <button class="btn btn-warning"
+                    t-att-disabled="!state.selectedRackId or state.saving"
+                    t-on-click="() => this.onSave(true)">
+                Save + Print
+            </button>
+        </t>
+    </Dialog>
+</t>
+
+</templates>