StatusBar: fix zero-severity noise, filter consistency, and avoid extra array allocation

[Copilot]

Three issues in the status bar's severity/position display, flagged in review:

• Zero-count severities shown – formatSeverityCounts unconditionally appended "0 info". All three severity parts now only emit when > 0.
• Severity totals from unfiltered data – severityCounts was computed from the raw entries array while entry count and position used the filtered set, creating an inconsistency (e.g. "0 entries | 3 errors"). Totals now reflect the active filter.
• Unnecessary array allocation – displayEntries materialized a full filtered copy of entries on every update just to get a count and an index. Replaced with a single-pass loop that computes filteredCount, severityCounts, and selectedPosition together, removing both the intermediate array and the now-redundant computeSeverityCounts helper.

// Before: three separate memos, one allocating a full filtered array
const severityCounts = useMemo(() => computeSeverityCounts(entries), [entries]);
const displayEntries = useMemo(() => filteredIds ? entries.filter(e => filteredIds.has(e.id)) : entries, [...]);
const selectedPosition = useMemo(() => displayEntries.findIndex(...), [displayEntries, selectedId]);

// After: one pass, severity from filtered set
const { filteredCount, severityCounts, selectedPosition } = useMemo(() => {
  let counter = 0, position = null, errors = 0, warnings = 0, info = 0;
  for (const entry of entries) {
    if (filteredIds && !filteredIds.has(entry.id)) continue;
    counter++;
    // accumulate severity + position
  }
  return { filteredCount: counter, severityCounts: { errors, warnings, info }, selectedPosition: position };
}, [entries, filteredIds, selectedId]);

---

📱 Kick off Copilot coding agent tasks wherever you are with GitHub Mobile, available on iOS and Android.

[Copilot]

Pull request overview

This PR refines the log view status bar to make its “entries / position / severities” display consistent with the active filter while reducing work done per update.

Changes:

• Suppresses zero-count severities in formatSeverityCounts (no more "0 info" noise).
• Computes severity totals from the filtered set (matching the filtered entry count/position).
• Replaces the filtered-array materialization with a single-pass aggregation over entries to derive filteredCount, severityCounts, and selectedPosition.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

Pull request overview

Updates the log status bar to present cleaner severity information and keep counts consistent with the active filter, while reducing unnecessary allocations during rendering.

Changes:

• Hide zero-count severities in formatSeverityCounts (no more “0 info” noise).
• Compute severity totals from the filtered entry set to match the displayed entry count/position.
• Remove the intermediate filtered array allocation by computing filteredCount and severity totals via iteration.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.