feat(cli): références d'attachments [file n]/[image n] dans le transcript + zone chat redimensionnable — #188 (QA verte)

- Attachments: projection canonique ChatPromptAttachmentDto (référence [file n]/[image n] par compteur de type, ordre d'import) insérée dans le prompt modèle et transportée par ReplyChunk::UserPrompt (attachmentRefs) ; rendu compact côté CustomAgentChatView.
- Resize: la zone chat (LeafView/LayoutGrid) est redimensionnable, taille actuelle conservée par défaut, préférence locale persistée.
- Tests: commands (projection des refs), dto_chat, chat_bridge, CustomAgentChatView, LayoutGrid.chat.

crates/app-tauri/tests/chat_bridge.rs

@@ -106,8 +106,22 @@ fn progress_chunk_with_id(
 
 fn chunk_bytes(chunk: &ReplyChunk) -> usize {
     match chunk {
-        ReplyChunk::UserPrompt { text, attachments } => {
-            text.len() + attachments.iter().map(String::len).sum::<usize>()
+        ReplyChunk::UserPrompt {
+            text,
+            attachments,
+            attachment_refs,
+        } => {
+            text.len()
+                + attachments.iter().map(String::len).sum::<usize>()
+                + attachment_refs
+                    .iter()
+                    .map(|attachment| {
+                        attachment.reference.len()
+                            + attachment.filename.len()
+                            + attachment.mime.len()
+                            + attachment.readable_path.len()
+                    })
+                    .sum::<usize>()
         }
         ReplyChunk::TextDelta { text } => text.len(),
         ReplyChunk::ToolActivity { label } => label.len(),

crates/app-tauri/tests/dto_chat.rs

@@ -8,9 +8,9 @@
 
 use app_tauri_lib::dto::{
     CellKind, ChatAttachmentDto, ChatAttachmentInputDto, ChatDraftScopeRequestDto,
-    ImportChatAttachmentsRequestDto, ImportChatAttachmentsResponseDto, ReadChatDraftResponseDto,
-    ReattachChatDto, ReplyChunk, ReplyProgressDto, ReplyProgressKindDto, ReplyProgressSourceDto,
-    ReplyProgressStageDto, SaveChatDraftRequestDto, TerminalSessionDto,
+    ChatPromptAttachmentDto, ImportChatAttachmentsRequestDto, ImportChatAttachmentsResponseDto,
+    ReadChatDraftResponseDto, ReattachChatDto, ReplyChunk, ReplyProgressDto, ReplyProgressKindDto,
+    ReplyProgressSourceDto, ReplyProgressStageDto, SaveChatDraftRequestDto, TerminalSessionDto,
 };
 use application::{LaunchAgentOutput, StructuredSessionDescriptor};
 use domain::project::ProjectPath;
@@ -28,6 +28,7 @@ fn reply_chunk_user_prompt_serialises_exact_camel_case() {
     let v = serde_json::to_value(ReplyChunk::UserPrompt {
         text: "run tests".into(),
         attachments: Vec::new(),
+        attachment_refs: Vec::new(),
     })
     .unwrap();
     assert_eq!(v, json!({ "kind": "userPrompt", "text": "run tests" }));
@@ -38,6 +39,13 @@ fn reply_chunk_user_prompt_serialises_attachment_labels() {
     let v = serde_json::to_value(ReplyChunk::UserPrompt {
         text: "describe this".into(),
         attachments: vec!["clipboard.png".into()],
+        attachment_refs: vec![ChatPromptAttachmentDto {
+            reference: "[image 1]".into(),
+            filename: "clipboard.png".into(),
+            mime: "image/png".into(),
+            size_bytes: 9,
+            readable_path: "/project/.ideai/attachments/agent-chat/s/attach-1-clipboard.png".into(),
+        }],
     })
     .unwrap();
     assert_eq!(
@@ -45,7 +53,14 @@ fn reply_chunk_user_prompt_serialises_attachment_labels() {
         json!({
             "kind": "userPrompt",
             "text": "describe this",
-            "attachments": ["clipboard.png"]
+            "attachments": ["clipboard.png"],
+            "attachmentRefs": [{
+                "reference": "[image 1]",
+                "filename": "clipboard.png",
+                "mime": "image/png",
+                "sizeBytes": 9,
+                "readablePath": "/project/.ideai/attachments/agent-chat/s/attach-1-clipboard.png"
+            }]
         })
     );
 }
@@ -128,6 +143,14 @@ fn reply_chunk_round_trips_through_json_for_every_variant() {
         ReplyChunk::UserPrompt {
             text: "u".into(),
             attachments: vec!["clipboard.png".into()],
+            attachment_refs: vec![ChatPromptAttachmentDto {
+                reference: "[image 1]".into(),
+                filename: "clipboard.png".into(),
+                mime: "image/png".into(),
+                size_bytes: 9,
+                readable_path: "/project/.ideai/attachments/agent-chat/s/attach-1-clipboard.png"
+                    .into(),
+            }],
         },
         ReplyChunk::TextDelta { text: "x".into() },
         ReplyChunk::ToolActivity {
@@ -168,7 +191,8 @@ fn reply_chunk_deserialises_from_camel_case_wire_payload() {
         back,
         ReplyChunk::UserPrompt {
             text: "hi".into(),
-            attachments: Vec::new()
+            attachments: Vec::new(),
+            attachment_refs: Vec::new()
         }
     );
 }
@@ -343,6 +367,7 @@ fn reattach_chat_dto_serialises_camel_case_with_typed_scrollback() {
             ReplyChunk::UserPrompt {
                 text: "Hi".into(),
                 attachments: Vec::new(),
+                attachment_refs: Vec::new(),
             },
             ReplyChunk::TextDelta { text: "Hi".into() },
             ReplyChunk::Final {