test: tighten shared message and ipv4 coverage

src/shared/chat-message-content.test.ts

@@ -10,10 +10,19 @@ describe("shared/chat-message-content", () => {
     ).toBe("hello");
   });
 
+  it("preserves empty-string text in the first block", () => {
+    expect(
+      extractFirstTextBlock({
+        content: [{ text: "" }, { text: "later" }],
+      }),
+    ).toBe("");
+  });
+
   it("returns undefined for missing, empty, or non-text content", () => {
     expect(extractFirstTextBlock(null)).toBeUndefined();
     expect(extractFirstTextBlock({ content: [] })).toBeUndefined();
     expect(extractFirstTextBlock({ content: [{ type: "image" }] })).toBeUndefined();
     expect(extractFirstTextBlock({ content: ["hello"] })).toBeUndefined();
+    expect(extractFirstTextBlock({ content: [{ text: 1 }, { text: "later" }] })).toBeUndefined();
   });
 });

src/shared/net/ipv4.test.ts

@@ -7,13 +7,18 @@ describe("shared/net/ipv4", () => {
       "IP address is required for custom bind mode",
     );
     expect(validateDottedDecimalIPv4Input("")).toBe("IP address is required for custom bind mode");
+    expect(validateDottedDecimalIPv4Input("   ")).toBe(
+      "Invalid IPv4 address (e.g., 192.168.1.100)",
+    );
   });
 
   it("accepts canonical dotted-decimal ipv4 only", () => {
     expect(validateDottedDecimalIPv4Input("192.168.1.100")).toBeUndefined();
+    expect(validateDottedDecimalIPv4Input(" 192.168.1.100 ")).toBeUndefined();
     expect(validateDottedDecimalIPv4Input("0177.0.0.1")).toBe(
       "Invalid IPv4 address (e.g., 192.168.1.100)",
     );
+    expect(validateDottedDecimalIPv4Input("[192.168.1.100]")).toBeUndefined();
     expect(validateDottedDecimalIPv4Input("example.com")).toBe(
       "Invalid IPv4 address (e.g., 192.168.1.100)",
     );