Open chat file links at the referenced line (#2309)

* fix(app): open chat file links at referenced lines

Pass chat file locations through the editable CodeMirror path so opening a reference selects and scrolls to its requested line. Cover the real assistant-link flow with a browser regression.

* fix(app): repeat chat file navigation

Track file navigation separately from stable tab identity so reopening the same path and line recenters both editable and read-only panes. Extend the browser regression to cover moving away and clicking the same link again.

* test(app): stabilize repeated file link navigation

packages/app/src/file-pane/editor/view.tsx

@@ -1,11 +1,14 @@
 import { Text, View } from "react-native";
 import { StyleSheet } from "react-native-unistyles";
 import type { HighlightStyle } from "@getpaseo/highlight";
+import type { WorkspaceFileLocation } from "@/workspace/file-open";
 import type { FileEditorModel } from "./model";
 
 export function FileEditorView(_props: {
   model: FileEditorModel;
   filename: string;
+  location: WorkspaceFileLocation;
+  navigationRevision: number;
   vimEnabled: boolean;
   theme: {
     background: string;

packages/app/src/file-pane/editor/view.web.tsx

@@ -3,12 +3,15 @@ import { Annotation, Compartment, EditorState, Transaction } from "@codemirror/s
 import { EditorView } from "@codemirror/view";
 import { getLanguageForFile } from "@getpaseo/highlight";
 import { getCM, vim } from "@replit/codemirror-vim";
+import type { WorkspaceFileLocation } from "@/workspace/file-open";
 import type { FileEditorModel } from "./model";
 import { editorBaseExtensions, editorTheme, type EditorVisualTheme } from "./extensions.web";
 
 interface FileEditorViewProps {
   model: FileEditorModel;
   filename: string;
+  location: WorkspaceFileLocation;
+  navigationRevision: number;
   vimEnabled: boolean;
   theme: EditorVisualTheme;
   onCursorChange(position: { line: number; column: number }): void;
@@ -22,6 +25,8 @@ const vimCompartment = new Compartment();
 export function FileEditorView({
   model,
   filename,
+  location,
+  navigationRevision,
   vimEnabled,
   theme,
   onCursorChange,
@@ -81,6 +86,19 @@ export function FileEditorView({
     });
   }, [snapshot.content]);
 
+  useEffect(() => {
+    const view = viewRef.current;
+    if (!view || !location.lineStart) return;
+    const lineStart = Math.min(location.lineStart, view.state.doc.lines);
+    const lineEnd = Math.min(location.lineEnd ?? lineStart, view.state.doc.lines);
+    const from = view.state.doc.line(lineStart).from;
+    const to = view.state.doc.line(Math.max(lineStart, lineEnd)).to;
+    view.dispatch({
+      selection: { anchor: from, head: lineEnd > lineStart ? to : from },
+      effects: EditorView.scrollIntoView(from, { y: "center" }),
+    });
+  }, [location.lineEnd, location.lineStart, navigationRevision]);
+
   useEffect(() => {
     viewRef.current?.dispatch({
       effects: languageCompartment.reconfigure(getLanguageForFile(filename)?.extension ?? []),