refactor(mcp): extract AddServerRequestBuilder and McpImportSummary

Extract request building and import summary formatting helpers.
Wire into McpServersViewModel with unit test coverage.

app/src/test/java/com/m57/hermescontrol/ui/mcp/AddServerRequestBuilderTest.kt

@@ -0,0 +1,95 @@
+package com.m57.hermescontrol.ui.mcp
+
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertNull
+import org.junit.Test
+
+class AddServerRequestBuilderTest {
+    @Test
+    fun `build HTTP mode creates request with url and auth`() {
+        val request =
+            AddServerRequestBuilder.build(
+                name = "  weather-server  ",
+                mode = AddServerMode.HTTP,
+                url = "  https://api.weather.com/mcp  ",
+                command = "ignored-cmd",
+                args = "ignored-arg",
+                auth = "header",
+                bearerToken = "  secret-token  ",
+            )
+        assertEquals("weather-server", request.name)
+        assertEquals("https://api.weather.com/mcp", request.url)
+        assertNull(request.command)
+        assertNull(request.args)
+        assertEquals("header", request.auth)
+        assertEquals("secret-token", request.bearerToken)
+    }
+
+    @Test
+    fun `build HTTP mode with none auth nulls auth and bearerToken`() {
+        val request =
+            AddServerRequestBuilder.build(
+                name = "public-server",
+                mode = AddServerMode.HTTP,
+                url = "https://example.com/mcp",
+                command = "",
+                args = "",
+                auth = "none",
+                bearerToken = "should-be-ignored",
+            )
+        assertEquals("public-server", request.name)
+        assertEquals("https://example.com/mcp", request.url)
+        assertNull(request.auth)
+        assertNull(request.bearerToken)
+    }
+
+    @Test
+    fun `build Stdio mode creates request with command and parsed args`() {
+        val request =
+            AddServerRequestBuilder.build(
+                name = "local-tools",
+                mode = AddServerMode.Stdio,
+                url = "https://ignored.com",
+                command = "  python3  ",
+                args = "  -m   mcp_server   --debug  ",
+                auth = "header",
+                bearerToken = "token",
+            )
+        assertEquals("local-tools", request.name)
+        assertNull(request.url)
+        assertEquals("python3", request.command)
+        assertEquals(listOf("-m", "mcp_server", "--debug"), request.args)
+        assertNull(request.auth)
+        assertNull(request.bearerToken)
+    }
+
+    @Test
+    fun `build Stdio mode with empty args nulls args`() {
+        val request =
+            AddServerRequestBuilder.build(
+                name = "npx-server",
+                mode = AddServerMode.Stdio,
+                url = "",
+                command = "npx server",
+                args = "    ",
+                auth = "none",
+                bearerToken = "",
+            )
+        assertEquals("npx server", request.command)
+        assertNull(request.args)
+    }
+
+    @Test
+    fun `build from McpServersUiState populates fields correctly`() {
+        val state =
+            McpServersUiState(
+                addServerName = "state-server",
+                addMode = AddServerMode.HTTP,
+                addServerUrl = "https://state.com",
+                addServerAuth = "none",
+            )
+        val request = AddServerRequestBuilder.build(state)
+        assertEquals("state-server", request.name)
+        assertEquals("https://state.com", request.url)
+    }
+}

app/src/test/java/com/m57/hermescontrol/ui/mcp/McpImportSummaryTest.kt

@@ -0,0 +1,24 @@
+package com.m57.hermescontrol.ui.mcp
+
+import org.junit.Assert.assertEquals
+import org.junit.Test
+
+class McpImportSummaryTest {
+    @Test
+    fun `formatSummary returns success message when zero errors`() {
+        val result = McpImportSummary.formatSummary(3, emptyList())
+        assertEquals("Successfully imported 3 server(s)", result)
+    }
+
+    @Test
+    fun `formatSummary returns partial success message when some failed`() {
+        val result = McpImportSummary.formatSummary(2, listOf("serverA: timeout", "serverB: 404"))
+        assertEquals("Imported 2 server(s), 2 failed: serverA: timeout; serverB: 404", result)
+    }
+
+    @Test
+    fun `formatSummary returns failure message when all failed`() {
+        val result = McpImportSummary.formatSummary(0, listOf("serverA: connection refused"))
+        assertEquals("Failed to import: serverA: connection refused", result)
+    }
+}