Fix syntax error in renderLogContent and add null check in cleanup

[Copilot]

Code review identified two bugs: a critical syntax error preventing builds and a potential null pointer exception.

Changes

• renderer/src/App.js: Remove duplicated/malformed return statements in renderLogContent function that caused webpack build failures

• main/index.js: Add null check for store in cleanup function to prevent crash if app exits before store initialization

Before (App.js)

return filteredEntries.map((entry, index) => {

return filteredEntries.map(({ entry, originalIndex }, idx) => {
return filteredEntries.map((entry, idx) => {
  return <LogEntry key={idx} entry={entry} index={idx} />;
});
};

After

return filteredEntries.map((entry, idx) => {
  return <LogEntry key={idx} entry={entry} index={idx} />;
});

Original prompt

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This section details on the original issue you should resolve

<issue_title>Perform a code review for any existing bugs</issue_title>
<issue_description></issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Perform a code review for any existing bugs #22

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