feat(chat): add animated GIF rendering with tap-to-play animation (#721) (#731)

* feat(chat): add animated GIF rendering with tap-to-play animation

Closes #721

* fix(#721): add missing GifImageThumbnail component and format ktlint

* fix(analytics): resolve ktlint indentation error in itemsIndexed

* feat(chat): add interactive play/pause toggle for animated GIFs

* fix(chat): control GIF playback via Animatable start and stop

app/src/test/java/com/m57/hermescontrol/ui/chat/ChatViewModelTest.kt

@@ -2032,6 +2032,9 @@ class ChatViewModelTest {
             advanceUntilIdle()
 
             assertNotNull(vm.uiState.value.openError)
-            assertTrue(vm.uiState.value.openError!!.contains("missing.pdf"))
+            assertTrue(
+                vm.uiState.value.openError!!
+                    .contains("missing.pdf"),
+            )
         }
 }

app/src/test/java/com/m57/hermescontrol/ui/chat/MarkdownTextFeatureTest.kt

@@ -222,4 +222,26 @@ class MarkdownTextFeatureTest {
         val blocks = parseBlocks(md)
         assertTrue("should remain a paragraph", blocks.single() is MdBlock.Paragraph)
     }
+
+    // 13. Attachment isGif check (issue #721)
+    @Test
+    fun testAttachment_isGif() {
+        val gifAttachment =
+            com.m57.hermescontrol.data.model.Attachment(
+                uri = "content://media/1.gif",
+                name = "test.gif",
+                mimeType = "image/gif",
+            )
+        assertTrue(gifAttachment.isImage)
+        assertTrue(gifAttachment.isGif)
+
+        val nonGifAttachment =
+            com.m57.hermescontrol.data.model.Attachment(
+                uri = "content://media/1.jpg",
+                name = "test.jpg",
+                mimeType = "image/jpeg",
+            )
+        assertTrue(nonGifAttachment.isImage)
+        assertFalse(nonGifAttachment.isGif)
+    }
 }

app/src/test/java/com/m57/hermescontrol/ui/chat/SlashCommandDispatchRpcTest.kt

@@ -191,7 +191,9 @@ class SlashCommandDispatchRpcTest {
             vm.sendMessage("/help")
             advanceUntilIdle()
 
-            val last = vm.uiState.value.messages.lastOrNull()
+            val last =
+                vm.uiState.value.messages
+                    .lastOrNull()
             assertEquals("⚠️ /help: session busy — /interrupt first", last?.content)
         }
 
@@ -232,7 +234,9 @@ class SlashCommandDispatchRpcTest {
             assertEquals(sessionId, params["session_id"])
 
             // And the slash.exec output must be surfaced to the user.
-            val last = vm.uiState.value.messages.lastOrNull()
+            val last =
+                vm.uiState.value.messages
+                    .lastOrNull()
             assertEquals("STATUS: gateway reachable", last?.content)
         }
 
@@ -254,7 +258,9 @@ class SlashCommandDispatchRpcTest {
             vm.sendMessage("/redraw")
             advanceUntilIdle()
 
-            val last = vm.uiState.value.messages.lastOrNull()
+            val last =
+                vm.uiState.value.messages
+                    .lastOrNull()
             assertTrue(
                 "expected a 'not supported on mobile' message, got: ${last?.content}",
                 last?.content?.contains("not supported on mobile") == true,
@@ -292,7 +298,9 @@ class SlashCommandDispatchRpcTest {
             advanceUntilIdle()
 
             // Both RPCs fail -> the secondary slash.exec error must surface.
-            val last = vm.uiState.value.messages.lastOrNull()
+            val last =
+                vm.uiState.value.messages
+                    .lastOrNull()
             assertEquals("⚠️ /status: slash worker start failed: boom", last?.content)
         }
 
@@ -327,6 +335,11 @@ class SlashCommandDispatchRpcTest {
             // must NOT append an assistant bubble — so the last message is still
             // the user's own command, and only one message was added.
             assertEquals(before + 1, vm.uiState.value.messages.size)
-            assertEquals("/status", vm.uiState.value.messages.lastOrNull()?.content)
+            assertEquals(
+                "/status",
+                vm.uiState.value.messages
+                    .lastOrNull()
+                    ?.content,
+            )
         }
 }