fix: Prioritize exact phrase matches and fix case-sensitive search

Co-authored-by: aider (gemini/gemini-2.5-pro) <aider@aider.chat>

src/search/search-engine.ts

@@ -481,6 +481,15 @@ export class SearchEngine {
         query
       )
 
+      let bestMatch: SearchMatch | undefined
+      if (
+        matches.length > 0 &&
+        query.getBestStringForExcerpt() &&
+        matches[0].match.toLowerCase() === query.getBestStringForExcerpt()
+      ) {
+        bestMatch = matches.shift()
+      }
+
       const lowerCaseBasename = note.basename.toLowerCase()
       const titleMatchWord = foundWords.find(word =>
         lowerCaseBasename.includes(word.toLowerCase())
@@ -514,6 +523,10 @@ export class SearchEngine {
         }
       }
 
+      if (bestMatch) {
+        matches.unshift(bestMatch)
+      }
+
       logVerbose(`Matches for note "${note.path}"`, matches)
       const resultNote: ResultNote = {
         score: result.score,