Add Coil image loading dependencies to firebase-ai

Introduces Coil 2 and Coil 3 dependencies for image loading. This
includes `coil-compose` for Coil 2, and `coil-compose`,
`coil-network-okhttp`, and `coil-svg` for Coil 3.

While these deps exist in the root `gradle/libs.versions.toml`, they
do not exist in the `firebase-ai/gradle/libs.versions.toml` file,
which is necessary to build the firebase-ai quickstart app.

Author: rlazo

firebase-ai/gradle/libs.versions.toml

@@ -1,6 +1,8 @@
 [versions]
 activityCompose = "1.12.1"
 agp = "9.0.0"
+coilCompose = "2.7.0"
+coil3Compose = "3.3.0"
 composeBom = "2025.10.00"
 composeNavigation = "2.9.6"
 coreKtx = "1.17.0"
@@ -36,6 +38,10 @@ androidx-ui-test-manifest = { group = "androidx.compose.ui", name = "ui-test-man
 androidx-ui-tooling = { group = "androidx.compose.ui", name = "ui-tooling" }
 androidx-ui-tooling-preview = { group = "androidx.compose.ui", name = "ui-tooling-preview" }
 androidx-webkit = { module = "androidx.webkit:webkit", version.ref = "webkit" }
+coil-compose = { module = "io.coil-kt:coil-compose", version.ref = "coilCompose" }
+coil-network-okhttp = { module = "io.coil-kt.coil3:coil-network-okhttp", version.ref = "coil3Compose" }
+coil-svg = { module = "io.coil-kt.coil3:coil-svg", version.ref = "coil3Compose" }
+coil3-coil-compose = { module = "io.coil-kt.coil3:coil-compose", version.ref = "coil3Compose" }
 compose-navigation = { group = "androidx.navigation", name = "navigation-compose", version.ref = "composeNavigation"}
 firebase-ai = { module = "com.google.firebase:firebase-ai" }
 firebase-bom = { module = "com.google.firebase:firebase-bom", version.ref = "firebaseBom" }