feat(ui): add read_command_output activity indicator

Show read progress in chat when read_command_output tool is used:
- Display 'Roo read command output (0 B - 100 KB of 263.3 KB)'
- Shows the specific byte range being read each call
- Uses same visual style as read_file tool
- Add 'tool' to ClineSay types
- Add readCommandOutput to ClineSayTool with readStart/readEnd/totalBytes

src/core/tools/ReadCommandOutputTool.ts

@@ -159,15 +159,34 @@ export class ReadCommandOutputTool extends BaseTool<"read_command_output"> {
 			}
 
 			let result: string
+			let readStart = 0
+			let readEnd = 0
 
 			if (search) {
 				// Search mode: filter lines matching the pattern
 				result = await this.searchInArtifact(artifactPath, search, totalSize, limit)
+				// For search, we're scanning the whole file
+				readStart = 0
+				readEnd = totalSize
 			} else {
 				// Normal read mode with offset/limit
 				result = await this.readArtifact(artifactPath, offset, limit, totalSize)
+				// Calculate actual read range
+				readStart = offset
+				readEnd = Math.min(offset + limit, totalSize)
 			}
 
+			// Report to UI that we read command output
+			await task.say(
+				"tool",
+				JSON.stringify({
+					tool: "readCommandOutput",
+					readStart,
+					readEnd,
+					totalBytes: totalSize,
+				}),
+			)
+
 			task.consecutiveMistakeCount = 0
 			pushToolResult(result)
 		} catch (error) {

webview-ui/src/components/chat/ChatRow.tsx

@@ -1470,7 +1470,6 @@ export const ChatRowContent = ({
 								if (bytes < 1024 * 1024) return `${(bytes / 1024).toFixed(1)} KB`
 								return `${(bytes / (1024 * 1024)).toFixed(1)} MB`
 							}
-
 							// Determine if this is a search operation
 							const isSearch = sayTool.searchPattern !== undefined