feat: Add temperature ranges for extruder and bed temps (#5)

Store extruder and bed temperatures as min/max ranges instead of
single values for more accurate filament specifications.

Backend changes:
- Add 4 new columns: settings_extruder_temp_min/max, settings_bed_temp_min/max
- Keep old columns for backward compatibility (marked deprecated)
- Alembic migration copies existing values to both min and max
- Update Pydantic models and API endpoints

Frontend changes:
- Filament model updated with new fields
- Create form uses min/max input pairs with Space.Compact
- Import from external DB populates both min and max with same value
- Label template updated to show ranges: "ET: 190-220 °C"
- Template help includes new tags

Labels now display temperature ranges like "190-220°C" which is more
useful for printing than a single recommended value.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

client/public/locales/en/common.json

@@ -236,6 +236,8 @@
             "comment": "Comment",
             "settings_extruder_temp": "Extruder Temp",
             "settings_bed_temp": "Bed Temp",
+            "temp_min": "Min",
+            "temp_max": "Max",
             "color_hex": "Color",
             "single_color": "Single",
             "multi_color": "Multi",

client/src/pages/filaments/create.tsx

@@ -1,6 +1,6 @@
 import { Create, useForm, useSelect } from "@refinedev/antd";
 import { HttpError, IResourceComponentsProps, useInvalidate, useTranslate } from "@refinedev/core";
-import { AutoComplete, Button, ColorPicker, Divider, Form, Input, InputNumber, Radio, Select, Typography } from "antd";
+import { AutoComplete, Button, ColorPicker, Divider, Form, Input, InputNumber, Radio, Select, Space, Typography } from "antd";
 import { PlusOutlined } from "@ant-design/icons";
 import TextArea from "antd/es/input/TextArea";
 import dayjs from "dayjs";
@@ -126,8 +126,10 @@ export const FilamentCreate: React.FC<IResourceComponentsProps & CreateOrClonePr
       color_hex: filament.color_hex,
       multi_color_hexes: filament.color_hexes?.join(",") || undefined,
       multi_color_direction: filament.multi_color_direction,
-      settings_extruder_temp: filament.extruder_temp || undefined,
-      settings_bed_temp: filament.bed_temp || undefined,
+      settings_extruder_temp_min: filament.extruder_temp || undefined,
+      settings_extruder_temp_max: filament.extruder_temp || undefined,
+      settings_bed_temp_min: filament.bed_temp || undefined,
+      settings_bed_temp_max: filament.bed_temp || undefined,
     });
   };
 
@@ -376,31 +378,43 @@ export const FilamentCreate: React.FC<IResourceComponentsProps & CreateOrClonePr
         >
           <InputNumber addonAfter="g" precision={1} />
         </Form.Item>
-        <Form.Item
-          label={t("filament.fields.settings_extruder_temp")}
-          name={["settings_extruder_temp"]}
-          rules={[
-            {
-              required: false,
-              type: "number",
-              min: 0,
-            },
-          ]}
-        >
-          <InputNumber addonAfter="°C" precision={0} />
+        <Form.Item label={t("filament.fields.settings_extruder_temp")}>
+          <Space.Compact>
+            <Form.Item
+              name={["settings_extruder_temp_min"]}
+              noStyle
+              rules={[{ type: "number", min: 0 }]}
+            >
+              <InputNumber placeholder={t("filament.fields.temp_min")} addonAfter="°C" precision={0} style={{ width: 140 }} />
+            </Form.Item>
+            <span style={{ padding: "4px 8px", background: "#fafafa", border: "1px solid #d9d9d9", borderLeft: 0, borderRight: 0 }}>-</span>
+            <Form.Item
+              name={["settings_extruder_temp_max"]}
+              noStyle
+              rules={[{ type: "number", min: 0 }]}
+            >
+              <InputNumber placeholder={t("filament.fields.temp_max")} addonAfter="°C" precision={0} style={{ width: 140 }} />
+            </Form.Item>
+          </Space.Compact>
         </Form.Item>
-        <Form.Item
-          label={t("filament.fields.settings_bed_temp")}
-          name={["settings_bed_temp"]}
-          rules={[
-            {
-              required: false,
-              type: "number",
-              min: 0,
-            },
-          ]}
-        >
-          <InputNumber addonAfter="°C" precision={0} />
+        <Form.Item label={t("filament.fields.settings_bed_temp")}>
+          <Space.Compact>
+            <Form.Item
+              name={["settings_bed_temp_min"]}
+              noStyle
+              rules={[{ type: "number", min: 0 }]}
+            >
+              <InputNumber placeholder={t("filament.fields.temp_min")} addonAfter="°C" precision={0} style={{ width: 140 }} />
+            </Form.Item>
+            <span style={{ padding: "4px 8px", background: "#fafafa", border: "1px solid #d9d9d9", borderLeft: 0, borderRight: 0 }}>-</span>
+            <Form.Item
+              name={["settings_bed_temp_max"]}
+              noStyle
+              rules={[{ type: "number", min: 0 }]}
+            >
+              <InputNumber placeholder={t("filament.fields.temp_max")} addonAfter="°C" precision={0} style={{ width: 140 }} />
+            </Form.Item>
+          </Space.Compact>
         </Form.Item>
         <Form.Item
           label={t("filament.fields.article_number")}

client/src/pages/filaments/model.tsx

@@ -15,6 +15,10 @@ export interface IFilament {
   comment?: string;
   settings_extruder_temp?: number;
   settings_bed_temp?: number;
+  settings_extruder_temp_min?: number;
+  settings_extruder_temp_max?: number;
+  settings_bed_temp_min?: number;
+  settings_bed_temp_max?: number;
   color_hex?: string;
   multi_color_hexes?: string;
   multi_color_direction?: string;

client/src/pages/printing/spoolQrCodePrintingDialog.tsx

@@ -157,8 +157,8 @@ const SpoolQRCodePrintingDialog: React.FC<SpoolQRCodePrintingDialog> = ({ spoolI
     `**{filament.vendor.name} - {filament.name}
 #{id} - {filament.material}**
 Spool Weight: {filament.spool_weight} g
-{ET: {filament.settings_extruder_temp} °C}
-{BT: {filament.settings_bed_temp} °C}
+{ET: {filament.settings_extruder_temp_min}-{filament.settings_extruder_temp_max} °C}
+{BT: {filament.settings_bed_temp_min}-{filament.settings_bed_temp_max} °C}
 {Lot Nr: {lot_nr}}
 {{comment}}
 {filament.comment}
@@ -201,6 +201,10 @@ Spool Weight: {filament.spool_weight} g
     { tag: "filament.comment" },
     { tag: "filament.settings_extruder_temp" },
     { tag: "filament.settings_bed_temp" },
+    { tag: "filament.settings_extruder_temp_min" },
+    { tag: "filament.settings_extruder_temp_max" },
+    { tag: "filament.settings_bed_temp_min" },
+    { tag: "filament.settings_bed_temp_max" },
     { tag: "filament.color_hex" },
     { tag: "filament.multi_color_hexes" },
     { tag: "filament.multi_color_direction" },