P2 Stream F + Stream U fix: JoinResidenceScreen + Coil test compile fix

Stream F: Convert JoinResidenceDialog -> dedicated screen matching iOS
JoinResidenceView. Invite-code input + inline validation + API success
navigates to residence detail.

Stream U fix: coil3 3.0.4 doesn't ship ColorImage (added in 3.1.0). Use
a minimal FakeImage test-double so CoilAuthInterceptorTest compiles.

Also completes consolidation of wave-3 work: all 6 parallel streams
(D/E/F/H/O/S/U) now landed. Full unit suite green.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

composeApp/src/androidUnitTest/kotlin/com/tt/honeyDue/network/CoilAuthInterceptorTest.kt

@@ -1,7 +1,7 @@
 package com.tt.honeyDue.network
 
 import androidx.test.core.app.ApplicationProvider
-import coil3.ColorImage
+import coil3.Image
 import coil3.PlatformContext
 import coil3.decode.DataSource
 import coil3.intercept.Interceptor
@@ -48,11 +48,20 @@ class CoilAuthInterceptorTest {
 
     private fun makeSuccess(request: ImageRequest): SuccessResult =
         SuccessResult(
-            image = ColorImage(0xFF000000.toInt()),
+            image = FakeImage(),
             request = request,
             dataSource = DataSource.NETWORK
         )
 
+    /** Minimal coil3.Image test-double — coil3 3.0.4 doesn't yet ship ColorImage. */
+    private class FakeImage : Image {
+        override val size: Long = 0L
+        override val width: Int = 1
+        override val height: Int = 1
+        override val shareable: Boolean = true
+        override fun draw(canvas: coil3.Canvas) {}
+    }
+
     private fun make401Error(request: ImageRequest): ErrorResult {
         val response = NetworkResponse(code = 401, headers = NetworkHeaders.EMPTY)
         return ErrorResult(