Load complete chat history when reaching the top (#2481)

* fix(chat): load older timeline history consistently

Pagination depended on scroll events, so short or compacted initial pages could never request older history. Reevaluate edge visibility as layout and history change, and standardize loading indicators on the canonical app spinner.

* fix(chat): keep older history loading reliably

Use authoritative timeline cursor progress so merged rows cannot stall pagination. Wait for bottom anchoring before evaluating the history edge, and re-arm retries on a fresh upward gesture without automatic failure loops.

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

@@ -1,3 +1,4 @@
+import { LoadingSpinner } from "@/components/ui/loading-spinner";
 import React, {
   useCallback,
   useEffect,
@@ -8,14 +9,8 @@ import React, {
 } from "react";
 import type { DaemonClient, FileReadResult } from "@getpaseo/client/internal/daemon-client";
 import type { FileVersion } from "@getpaseo/protocol/messages";
-import {
-  ActivityIndicator,
-  Image as RNImage,
-  ScrollView as RNScrollView,
-  Text,
-  View,
-} from "react-native";
-import { StyleSheet, UnistylesRuntime } from "react-native-unistyles";
+import { Image as RNImage, ScrollView as RNScrollView, Text, View } from "react-native";
+import { StyleSheet, UnistylesRuntime, withUnistyles } from "react-native-unistyles";
 import { useTranslation } from "react-i18next";
 import { MarkdownRenderer } from "@/components/markdown/renderer";
 import { useIsCompactFormFactor } from "@/constants/layout";
@@ -44,6 +39,12 @@ import { FileEditorModel, type FileEditorFile } from "./editor/model";
 import { FileEditorView } from "./editor/view";
 import { confirmDialog } from "@/utils/confirm-dialog";
 import { usePublishPanelInstanceAttributes } from "@/panels/panel-instance-attributes";
+import type { Theme } from "@/styles/theme";
+
+const ThemedLoadingSpinner = withUnistyles(LoadingSpinner);
+const foregroundMutedColorMapping = (theme: Theme) => ({
+  color: theme.colors.foregroundMuted,
+});
 
 interface CodeLineProps {
   tokens: HighlightToken[];
@@ -264,7 +265,7 @@ function FilePreviewBody({
   if (isLoading && !preview) {
     return (
       <View style={styles.centerState}>
-        <ActivityIndicator size="small" />
+        <ThemedLoadingSpinner size="small" uniProps={foregroundMutedColorMapping} />
         <Text style={styles.loadingText}>{t("panels.file.loading")}</Text>
       </View>
     );
@@ -346,7 +347,7 @@ function FilePreviewBody({
     if (!imagePreviewUri) {
       return (
         <View style={styles.centerState}>
-          <ActivityIndicator size="small" />
+          <ThemedLoadingSpinner size="small" uniProps={foregroundMutedColorMapping} />
           <Text style={styles.loadingText}>{t("panels.file.loading")}</Text>
         </View>
       );