feat(#365): add pin support for models with pinned section at top (#414)

* feat(#365): add pin support for models with pinned section at top

* fix(#365): stub Pinned Models methods in E2eIntegrationTest

* fix(#365): use state flow for pin/unpin, add max cap, add ViewModel tests

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

app/src/test/java/com/m57/hermescontrol/E2eIntegrationTest.kt

@@ -88,6 +88,8 @@ class E2eIntegrationTest {
         every { AuthManager.getProfileToken(any()) } returns null
         every { AuthManager.setProfileToken(any(), any()) } returns Unit
         every { AuthManager.saveConnectionProfiles(any()) } returns Unit
+        every { AuthManager.getPinnedModels() } returns emptyList()
+        every { AuthManager.savePinnedModels(any()) } returns Unit
 
         // Application stubs
         every { mockApp.getString(R.string.connect_error_401) } returns "Invalid token (401 Unauthorized)"