Fix PR #60 CI failures and address CodeRabbit feedback

- Restore raw tokensSeen for session summaries; keep filtered counts for aggregates/known-words
- Fix missing headword binding in insertFilteredWordOccurrence test fixture
- Page vocabulary stats until enough visible rows collected after post-query filtering
- Use lifetime totals for library/detail word counts instead of partial retained-session sums
- Prefer stored rollup totals over recomputed session counts when recomputation is partial
- Emit flat known-word timeline points for line indexes with no occurrences
- Roll back local excluded-word state and throw on failed persistence
- Reset initialized flag on load failure to allow retry on next call
- Restore globalThis.localStorage after each excluded-words test

src/core/services/stats-server.ts

@@ -452,7 +452,7 @@ export function createStatsApp(
       }
     }
 
-    const sortedLineIndices = [...totalLineGroups.keys()].sort((a, b) => a - b);
+    const maxLineIndex = Math.max(...totalLineGroups.keys(), ...knownLineGroups.keys(), -1);
     let knownWordsSeen = 0;
     let totalWordsSeen = 0;
     const knownByLinesSeen: Array<{
@@ -461,9 +461,9 @@ export function createStatsApp(
       totalWordsSeen: number;
     }> = [];
 
-    for (const lineIdx of sortedLineIndices) {
+    for (let lineIdx = 0; lineIdx <= maxLineIndex; lineIdx += 1) {
       knownWordsSeen += knownLineGroups.get(lineIdx) ?? 0;
-      totalWordsSeen += totalLineGroups.get(lineIdx)!;
+      totalWordsSeen += totalLineGroups.get(lineIdx) ?? 0;
       knownByLinesSeen.push({
         linesSeen: lineIdx,
         knownWordsSeen,