fix(code search): various ui/ux improvements raised by user research (#4332)

various improvements from [user research](https://codeberg.org/forgejo/user-research/src/branch/main/interviews/2024-06/issues%28search%2Cfeatures%29%2Cselfhosting%2CCI%2Caccessibility%2Ccodesearch.md)

- filenames are links to the respective files
  fixes: `fold menu: user clicked and expected to view file, instead the file collapsed`

- refactor(searchfile.tmpl): ordered lists with lines grouped together instead of table
  fixes: `multiple matches per file are "merged", only visible in the code lines (no visual separation)`

- feat: display fuzzy as "Either" when using git-grep which is much more accurate than "fuzzy"
  git-grep does not support fuzzy searching, in this context selecting fuzzy searching worked similar to an OR of white space separated keywords
  fixes: `typo doesn't bring results in fuzzy search`

---

<details>
<summary>Before</summary>

![1](https://codeberg.org/attachments/5173357f-8dce-470c-9a9e-84a30517c216)
</details>

<details>
<summary>After</summary>

![after](https://codeberg.org/attachments/f8ec15dd-08ce-41f2-9326-d823de6f2395)
</details>

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/4332
Reviewed-by: 0ko <0ko@noreply.codeberg.org>
Co-authored-by: Shiny Nematoda <snematoda.751k2@aleeas.com>
Co-committed-by: Shiny Nematoda <snematoda.751k2@aleeas.com>

tests/integration/repo_search_test.go

@@ -20,11 +20,20 @@ import (
 )
 
 func resultFilenames(t testing.TB, doc *HTMLDoc) []string {
-	filenameSelections := doc.Find(".repository.search").Find("details.repo-search-result").Find(".header").Find("span.file")
-	result := make([]string, filenameSelections.Length())
-	filenameSelections.Each(func(i int, selection *goquery.Selection) {
-		result[i] = selection.Text()
+	resultSelections := doc.
+		Find(".repository.search").
+		Find("details.repo-search-result")
+
+	result := make([]string, resultSelections.Length())
+	resultSelections.Each(func(i int, selection *goquery.Selection) {
+		assert.True(t, resultSelections.Find("div ol li").Length() > 0)
+		result[i] = selection.
+			Find(".header").
+			Find("span.file a.file-link").
+			First().
+			Text()
 	})
+
 	return result
 }
 
@@ -77,7 +86,7 @@ func testSearchRepo(t *testing.T, indexer bool) {
 		testSearch(t, "/user2/glob/search?q=file4&page=1", []string{"x/b.txt", "a.txt"}, indexer)
 		testSearch(t, "/user2/glob/search?q=file5&page=1", []string{"x/b.txt", "a.txt"}, indexer)
 	} else {
-		// fuzzy search: OR of all the keywords
+		// fuzzy search: Union/OR of all the keywords
 		// when indexer is disabled
 		testSearch(t, "/user2/glob/search?q=file3+file1&page=1", []string{"a.txt", "x/b.txt"}, indexer)
 		testSearch(t, "/user2/glob/search?q=file4&page=1", []string{}, indexer)
@@ -102,6 +111,23 @@ func testSearch(t *testing.T, url string, expected []string, indexer bool) {
 	branchDropdown := container.Find(".js-branch-tag-selector")
 	assert.EqualValues(t, indexer, len(branchDropdown.Nodes) == 0)
 
+	// if indexer is disabled "fuzzy" should be displayed as "union"
+	expectedFuzzy := "Fuzzy"
+	if !indexer {
+		expectedFuzzy = "Union"
+	}
+
+	fuzzyDropdown := container.Find(".ui.dropdown[data-test-tag=fuzzy-dropdown]")
+	actualFuzzyText := fuzzyDropdown.Find(".menu .item[data-value=true]").First().Text()
+	assert.EqualValues(t, expectedFuzzy, actualFuzzyText)
+
+	if fuzzyDropdown.
+		Find("input[name=fuzzy][value=true]").
+		Length() != 0 {
+		actualFuzzyText = fuzzyDropdown.Find("div.text").First().Text()
+		assert.EqualValues(t, expectedFuzzy, actualFuzzyText)
+	}
+
 	filenames := resultFilenames(t, doc)
 	assert.EqualValues(t, expected, filenames)
 }