feat(wallet): payment card timeline item and raw event handling (Tasks 7+8)

Task 7: Timeline Payment Card
- TimelineItemPaymentView integration with TimelineItemEventContentView
- Payment card rendering for both sender and recipient perspectives
- Unit tests for TimelineItemPaymentContent

Task 8: Raw Event Handling
- Modified TimelineItemContentMessageFactory to intercept payment events
- Added isSentByMe parameter propagation through content factories
- FakePaymentEventSender for testing
- Unit tests for TimelineItemContentPaymentFactory

SDK Limitation Workaround:
Since matrix-rust-sdk doesn't expose raw event sending or UnknownContent
raw JSON, payment events are encoded as text messages with a marker:
[cardano-payment:v1]{...json...}

This falls back gracefully for non-wallet clients while enabling
rich payment card rendering for wallet-enabled clients.

features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/timeline/components/event/TimelineItemEventContentView.kt

@@ -30,6 +30,8 @@ import io.element.android.features.messages.impl.timeline.model.event.TimelineIt
 import io.element.android.features.messages.impl.timeline.model.event.TimelineItemUnknownContent
 import io.element.android.features.messages.impl.timeline.model.event.TimelineItemVideoContent
 import io.element.android.features.messages.impl.timeline.model.event.TimelineItemVoiceContent
+import io.element.android.features.wallet.api.timeline.TimelineItemPaymentContent
+import io.element.android.features.wallet.impl.timeline.TimelineItemPaymentView
 import io.element.android.libraries.architecture.Presenter
 import io.element.android.libraries.voiceplayer.api.VoiceMessageState
 import io.element.android.wysiwyg.link.Link
@@ -134,6 +136,10 @@ fun TimelineItemEventContentView(
                 modifier = modifier
             )
         }
+        is TimelineItemPaymentContent -> TimelineItemPaymentView(
+            content = content,
+            modifier = modifier
+        )
         is TimelineItemRtcNotificationContent -> error("This shouldn't be rendered as the content of a bubble")
     }
 }

features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/timeline/factories/event/TimelineItemContentFactory.kt

@@ -78,6 +78,7 @@ class TimelineItemContentFactory(
                     senderProfile = senderProfile,
                     content = itemContent,
                     eventId = eventId,
+                    isSentByMe = isOutgoing,
                 )
             }
             is ProfileChangeContent -> {

features/messages/impl/src/main/kotlin/io/element/android/features/messages/impl/timeline/factories/event/TimelineItemContentMessageFactory.kt

@@ -73,6 +73,7 @@ class TimelineItemContentMessageFactory(
         senderId: UserId,
         senderProfile: ProfileDetails,
         eventId: EventId?,
+        isSentByMe: Boolean = false,
     ): TimelineItemEventContent {
         return when (val messageType = content.type) {
             is EmoteMessageType -> {
@@ -256,16 +257,13 @@ class TimelineItemContentMessageFactory(
             }
             is TextMessageType -> {
                 val body = messageType.body.trimEnd()
-                val dom = messageType.formatted?.toHtmlDocument(permalinkParser = permalinkParser)
-                val formattedBody = dom?.let(::parseHtml)
-                    ?: textPillificationHelper.pillify(body).safeLinkify()
-                val htmlDocument = messageType.formatted?.toHtmlDocument(permalinkParser = permalinkParser)
-                TimelineItemTextContent(
-                    body = body,
-                    htmlDocument = htmlDocument,
-                    formattedBody = formattedBody,
-                    isEdited = content.isEdited,
-                )
+                // Check for Cardano payment events embedded in text messages
+                if (paymentFactory.isPaymentEvent(body)) {
+                    paymentFactory.createFromBody(body, isSentByMe)
+                        ?: createTextContent(body, messageType, content.isEdited)
+                } else {
+                    createTextContent(body, messageType, content.isEdited)
+                }
             }
             is OtherMessageType -> {
                 val body = messageType.body.trimEnd()
@@ -279,6 +277,23 @@ class TimelineItemContentMessageFactory(
         }
     }
 
+    private fun createTextContent(
+        body: String,
+        messageType: TextMessageType,
+        isEdited: Boolean,
+    ): TimelineItemTextContent {
+        val dom = messageType.formatted?.toHtmlDocument(permalinkParser = permalinkParser)
+        val formattedBody = dom?.let(::parseHtml)
+            ?: textPillificationHelper.pillify(body).safeLinkify()
+        val htmlDocument = messageType.formatted?.toHtmlDocument(permalinkParser = permalinkParser)
+        return TimelineItemTextContent(
+            body = body,
+            htmlDocument = htmlDocument,
+            formattedBody = formattedBody,
+            isEdited = isEdited,
+        )
+    }
+
     private fun aspectRatioOf(width: Long?, height: Long?): Float? {
         val result = if (height != null && width != null) {
             width.toFloat() / height.toFloat()