refactor: remove verified dead code across data, UI, and resources (#680)

* refactor: remove unused dead code across data, UI, and resources

* fix: resolve dangling references left by dead-code removal

Restore empty object Motion (braces required) and remove the 12 stale
test usages that still called the now-deleted production symbols:
- ServerStoreTest: removeServer/switchToServer tests
- ServerEndpointTest: isCleartext assertions
- ConnectViewModelTest: onHostChange/onPortChange tests + 3 dropped R.string refs
- SettingsViewModelTest: renameProfile tests + clearNavigateToLogin
- E2eIntegrationTest: previewSkill tests + onHostChange/onPortChange calls

Verified locally: compileDebugUnitTestKotlin + 48 tests pass.

* fix: remove unused imports flagged by ktlint

Drops 4 no-longer-referenced imports left by the dead-code removal:
- HermesApiService: SkillScanResponse (scanHubSkill removed)
- ServerEndpointTest: assertFalse, assertTrue (isCleartext assertions dropped)
- SettingsViewModelTest: assertFalse (rename tests removed)

---------

Co-authored-by: M57 <hy4ri@users.noreply.github.com>

app/src/test/java/com/m57/hermescontrol/data/remote/ServerEndpointTest.kt

@@ -1,9 +1,7 @@
 package com.m57.hermescontrol.data.remote
 
 import org.junit.Assert.assertEquals
-import org.junit.Assert.assertFalse
 import org.junit.Assert.assertNull
-import org.junit.Assert.assertTrue
 import org.junit.Assert.fail
 import org.junit.Test
 
@@ -13,7 +11,6 @@ class ServerEndpointTest {
         val ep = ServerEndpoint.parse("https://example.com/hermes", CleartextPolicy.ALLOW_WITH_WARNING)
         assertEquals("https://example.com/hermes/", ep.baseUrl.toString())
         assertNull(ep.securityWarning)
-        assertFalse(ep.isCleartext)
     }
 
     @Test
@@ -21,7 +18,6 @@ class ServerEndpointTest {
         val ep = ServerEndpoint.parse("http://127.0.0.1:9119/", CleartextPolicy.ALLOW_WITH_WARNING)
         assertEquals("http://127.0.0.1:9119/", ep.baseUrl.toString())
         assertEquals(ServerEndpoint.CLEARTEXT_WARNING, ep.securityWarning)
-        assertTrue(ep.isCleartext)
     }
 
     @Test
@@ -130,7 +126,6 @@ class ServerEndpointTest {
     fun `fromLegacy preserves http host and port`() {
         val ep = ServerEndpoint.fromLegacy("10.0.0.1", 8080)
         assertEquals("http://10.0.0.1:8080/", ep.baseUrl.toString())
-        assertTrue(ep.isCleartext)
     }
 
     @Test