fix(app): restore line numbers in diff gutter and add tap-to-comment

The gutter was showing the message-circle icon on every reviewable line on
native and on compact form factors, displacing the line number whenever
review draft mode was active. Restore the default by computing showAction
purely from interaction state (hover/press), comment presence, and editor
visibility — drop the showPersistentAction flag and the isNative bias.

Tap on the gutter directly opens the inline review editor on every
platform. On native, long-pressing a line of code (350ms) also opens the
editor via a new LongPressableLine wrapper, preserving web text selection.

packages/app/src/review/surface.tsx

@@ -12,7 +12,7 @@ import {
   type ViewStyle,
 } from "react-native";
 import { StyleSheet, useUnistyles } from "react-native-unistyles";
-import { isNative, isWeb } from "@/constants/platform";
+import { isWeb } from "@/constants/platform";
 import { useReviewDraftComments, useReviewDraftStore, type ReviewDraftComment } from "./store";
 import { buildReviewableDiffTargetKey, type ReviewableDiffTarget } from "@/utils/diff-layout";
 
@@ -44,7 +44,6 @@ export interface InlineReviewEditorState {
 export interface InlineReviewActions {
   commentsByTarget: ReadonlyMap<string, ReviewDraftComment[]>;
   editor: InlineReviewEditorState | null;
-  showPersistentAction: boolean;
   onStartComment: (target: ReviewableDiffTarget) => void;
   onEditComment: (target: ReviewableDiffTarget, comment: ReviewDraftComment) => void;
   onCancelEditor: () => void;
@@ -63,10 +62,7 @@ export function groupInlineReviewCommentsByTarget(
   return grouped;
 }
 
-export function useInlineReviewController(input: {
-  reviewDraftKey: string;
-  showPersistentAction: boolean;
-}): InlineReviewActions {
+export function useInlineReviewController(input: { reviewDraftKey: string }): InlineReviewActions {
   const reviewComments = useReviewDraftComments(input.reviewDraftKey);
   const commentsByTarget = useMemo(
     () => groupInlineReviewCommentsByTarget(reviewComments),
@@ -137,7 +133,6 @@ export function useInlineReviewController(input: {
     () => ({
       commentsByTarget,
       editor,
-      showPersistentAction: input.showPersistentAction,
       onStartComment: handleStartComment,
       onEditComment: handleEditComment,
       onCancelEditor: handleCancelEditor,
@@ -152,7 +147,6 @@ export function useInlineReviewController(input: {
       handleEditComment,
       handleSaveEditor,
       handleStartComment,
-      input.showPersistentAction,
     ],
   );
 }
@@ -235,7 +229,6 @@ export function InlineReviewGutterCell({
   reviewTarget,
   comments,
   isEditorOpen,
-  showPersistentAction,
   onStartComment,
   style,
 }: {
@@ -243,7 +236,6 @@ export function InlineReviewGutterCell({
   reviewTarget: ReviewableDiffTarget | null | undefined;
   comments: readonly ReviewDraftComment[];
   isEditorOpen: boolean;
-  showPersistentAction: boolean;
   onStartComment: (target: ReviewableDiffTarget) => void;
   style?: StyleProp<ViewStyle>;
 }) {
@@ -280,9 +272,7 @@ export function InlineReviewGutterCell({
       style={pressableStyle}
     >
       {({ hovered, pressed }) => {
-        const showAction =
-          canComment &&
-          (hovered || pressed || isNative || showPersistentAction || hasComments || isEditorOpen);
+        const showAction = canComment && (hovered || pressed || hasComments || isEditorOpen);
         return (
           <View style={styles.gutterInner}>
             <View style={labelStyle}>