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>

templates/shared/search/code/results.tmpl

@@ -26,7 +26,10 @@
 							- {{.Filename}}
 						</span>
 					{{else}}
-						<span class="file tw-flex-1 tw-ml-2">{{.Filename}}</span>
+						<span class="file tw-flex-1 tw-ml-2">
+							<a rel="nofollow" class="muted file-link" href="{{$repo.Link}}/src/commit/{{$result.CommitID | PathEscape}}/{{.Filename | PathEscapeSegments}}">{{/*
+							*/}}{{.Filename}}</a>
+						</span>
 					{{end}}
 					<a role="button" class="ui basic tiny button" rel="nofollow" href="{{$repo.Link}}/src/commit/{{$result.CommitID | PathEscape}}/{{.Filename | PathEscapeSegments}}">{{ctx.Locale.Tr "repo.diff.view_file"}}</a>
 				</h4>

templates/shared/search/code/search.tmpl

@@ -1,5 +1,11 @@
 <form class="ui form ignore-dirty">
-	{{template "shared/search/combo_fuzzy" dict "Value" .Keyword "Disabled" .CodeIndexerUnavailable "IsFuzzy" .IsFuzzy "Placeholder" (ctx.Locale.Tr "search.code_kind")}}
+	{{template "shared/search/combo_fuzzy"
+		dict
+			"Value" .Keyword
+			"Disabled" .CodeIndexerUnavailable
+			"IsFuzzy" .IsFuzzy
+			"Placeholder" (ctx.Locale.Tr "search.code_kind")
+			"CodeIndexerDisabled" $.CodeIndexerDisabled}}
 </form>
 <div class="divider"></div>
 <div class="ui user list">