fix: respect dateStart/dateEnd filters in Chroma search path (#1343)

When a search query includes dateStart/dateEnd parameters, the Chroma
semantic search path (PATH 2) ignored them entirely and only applied a
hardcoded 90-day recency window. This meant date-filtered searches
returned results from outside the requested range.

Now the Chroma path checks for a user-provided dateRange first. If
present, it filters results by the requested start/end bounds. The
90-day window is only used as the default when no date filter is
specified, preserving backward compatibility.

Fixes #1324

Signed-off-by: umut-polat <52835619+umut-polat@users.noreply.github.com>

src/services/worker/SearchManager.ts

@@ -180,15 +180,37 @@ export class SearchManager {
       logger.debug('SEARCH', 'ChromaDB returned semantic matches', { matchCount: chromaResults.ids.length });
 
       if (chromaResults.ids.length > 0) {
-        // Step 2: Filter by recency (90 days)
+        // Step 2: Filter by date range
-        const ninetyDaysAgo = Date.now() - SEARCH_CONSTANTS.RECENCY_WINDOW_MS;
+        // Use user-provided dateRange if available, otherwise fall back to 90-day recency window
+        const { dateRange } = options;
+        let startEpoch: number | undefined;
+        let endEpoch: number | undefined;
+
+        if (dateRange) {
+          if (dateRange.start) {
+            startEpoch = typeof dateRange.start === 'number'
+              ? dateRange.start
+              : new Date(dateRange.start).getTime();
+          }
+          if (dateRange.end) {
+            endEpoch = typeof dateRange.end === 'number'
+              ? dateRange.end
+              : new Date(dateRange.end).getTime();
+          }
+        } else {
+          // Default: 90-day recency window
+          startEpoch = Date.now() - SEARCH_CONSTANTS.RECENCY_WINDOW_MS;
+        }
+
         const recentMetadata = chromaResults.metadatas.map((meta, idx) => ({
           id: chromaResults.ids[idx],
           meta,
-          isRecent: meta && meta.created_at_epoch > ninetyDaysAgo
+          isRecent: meta && meta.created_at_epoch != null
+            && (!startEpoch || meta.created_at_epoch >= startEpoch)
+            && (!endEpoch || meta.created_at_epoch <= endEpoch)
         })).filter(item => item.isRecent);
 
-        logger.debug('SEARCH', 'Results within 90-day window', { count: recentMetadata.length });
+        logger.debug('SEARCH', dateRange ? 'Results within user date range' : 'Results within 90-day window', { count: recentMetadata.length });
 
         // Step 3: Categorize IDs by document type
         const obsIds: number[] = [];