feat: service console auto-connect, settings panel, and batch of enhancements

- Auto-connect WebSocket on page load in service console
- Settings modal for editing sgclaw_config.json (API key, base URL, model, skills dir, etc.)
- UpdateConfig/ConfigUpdated protocol messages for remote config save
- save_to_path() for SgClawSettings serialization
- ConfigUpdated handler in sg_claw_client binary
- Protocol serialization tests for new message types
- HTML test assertions for auto-connect and settings UI
- Additional pending changes: deterministic submit, org units, lineloss xlsx export, browser script tool, and docs

🤖 Generated with [Qoder][https://qoder.com]

tests/lineloss_xlsx_export_test.rs

@@ -0,0 +1,105 @@
+use std::fs;
+use std::path::PathBuf;
+
+use serde_json::json;
+use sgclaw::compat::lineloss_xlsx_export::{export_lineloss_xlsx, LinelossExportRequest};
+
+fn temp_output_path(name: &str) -> PathBuf {
+    let dir = std::env::temp_dir().join("sgclaw-test-xlsx");
+    fs::create_dir_all(&dir).unwrap();
+    dir.join(name)
+}
+
+#[test]
+fn export_month_lineloss_produces_valid_xlsx() {
+    let output_path = temp_output_path("month-test.xlsx");
+    if output_path.exists() {
+        fs::remove_file(&output_path).unwrap();
+    }
+
+    let request = LinelossExportRequest {
+        sheet_name: "国网兰州供电公司月度线损分析报表(2026-03)".to_string(),
+        column_defs: vec![
+            ("ORG_NAME".to_string(), "供电单位".to_string()),
+            ("YGDL".to_string(), "累计供电量".to_string()),
+            ("YYDL".to_string(), "累计售电量".to_string()),
+            ("YXSL".to_string(), "线损完成率(%)".to_string()),
+            ("RAT_SCOPE".to_string(), "线损率累计目标值".to_string()),
+            ("BLANK3".to_string(), "目标完成率".to_string()),
+            ("BLANK2".to_string(), "排行".to_string()),
+        ],
+        rows: vec![
+            serde_json::from_value(json!({
+                "ORG_NAME": "城关供电",
+                "YGDL": "12345.67",
+                "YYDL": "11234.56",
+                "YXSL": "9.00",
+                "RAT_SCOPE": "9.50",
+                "BLANK3": "94.74",
+                "BLANK2": "1"
+            }))
+            .unwrap(),
+            serde_json::from_value(json!({
+                "ORG_NAME": "七里河供电",
+                "YGDL": "9876.54",
+                "YYDL": "8765.43",
+                "YXSL": "11.24",
+                "RAT_SCOPE": "10.00",
+                "BLANK3": "112.40",
+                "BLANK2": "2"
+            }))
+            .unwrap(),
+        ],
+        output_path: output_path.clone(),
+    };
+
+    let result_path = export_lineloss_xlsx(&request).unwrap();
+    assert_eq!(result_path, output_path);
+    assert!(output_path.exists());
+
+    // Verify it's a valid ZIP (xlsx is a zip archive)
+    let file = fs::File::open(&output_path).unwrap();
+    let mut archive = zip::ZipArchive::new(file).unwrap();
+
+    // Must contain the standard OpenXML entries
+    let entry_names: Vec<String> = (0..archive.len())
+        .map(|i| archive.by_index(i).unwrap().name().to_string())
+        .collect();
+
+    assert!(entry_names.contains(&"[Content_Types].xml".to_string()));
+    assert!(entry_names.contains(&"xl/worksheets/sheet1.xml".to_string()));
+    assert!(entry_names.contains(&"xl/workbook.xml".to_string()));
+
+    // Read sheet1.xml and verify it contains our data
+    let mut sheet = archive.by_name("xl/worksheets/sheet1.xml").unwrap();
+    let mut xml = String::new();
+    std::io::Read::read_to_string(&mut sheet, &mut xml).unwrap();
+
+    assert!(xml.contains("供电单位"), "header row should contain 供电单位");
+    assert!(xml.contains("累计供电量"), "header row should contain 累计供电量");
+    assert!(xml.contains("城关供电"), "data should contain 城关供电");
+    assert!(xml.contains("12345.67"), "data should contain 12345.67");
+    assert!(xml.contains("七里河供电"), "data should contain second row");
+
+    // Cleanup
+    fs::remove_file(&output_path).unwrap();
+}
+
+#[test]
+fn export_empty_rows_returns_error() {
+    let output_path = temp_output_path("empty-test.xlsx");
+
+    let request = LinelossExportRequest {
+        sheet_name: "test".to_string(),
+        column_defs: vec![("A".to_string(), "ColA".to_string())],
+        rows: vec![],
+        output_path: output_path.clone(),
+    };
+
+    let result = export_lineloss_xlsx(&request);
+    assert!(result.is_err());
+    assert!(
+        result.unwrap_err().to_string().contains("rows must not be empty"),
+        "should reject empty rows"
+    );
+}