[FEAT] expose fuzzy search for issues/repo (#4160)

Ports fuzzy search for `/issues` and `/pulls` from gitea.
Adds fuzzy search for `/user/repo/issues` and `/user/repo/pulls`.

---
## Notes
### Port: [`gitea#be5be0ac81`](be5be0ac81)

- CONFLICT (content): Merge conflict in routers/web/user/home.go

Conflict resolved by
  1. keeping both `PageIsOrgIssues` and the newly introduced `IsFuzzy`
  2. using `pager.AddParam(ctx, "fuzzy", "IsFuzzy")` rather than `pager.AddParamString("fuzzy", fmt.Sprintf("%v", isFuzzy))`

- CONFLICT (content): Merge conflict in templates/user/dashboard/issues.tmpl

Conflict resolved by keeping the changes from #4096, and picking the `&fuzzy=${{.IsFuzzy}}` inclusion to all urls and `{{if .PageIsPulls}}...`

### Port: [`gitea#fede3cbada`](fede3cbada)

- CONFLICT (content): Merge conflict in templates/user/dashboard/issues.tmpl

Conflict resolved by keeping previous changes and picking the replacement of `{{if .PageIsPulls}}...` with `{{template "shared/search/combo_fuzzy"...` which contains the replacement of `explorer.go` to `explorer.go_to`

### Fixup commit

replaces `Iif` with `if` which was introduced in gitea#fede3cbada

### Feature commit

adds in support for /user/repo/(issues|pulls) + test

Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: Kerwin Bryant <kerwin612@qq.com>
Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/4160
Reviewed-by: twenty-panda <twenty-panda@noreply.codeberg.org>
Reviewed-by: Earl Warren <earl-warren@noreply.codeberg.org>
Co-authored-by: Shiny Nematoda <snematoda.751k2@aleeas.com>
Co-committed-by: Shiny Nematoda <snematoda.751k2@aleeas.com>

web_src/css/form.css

@@ -40,7 +40,7 @@ textarea,
 
 /* fix fomantic small dropdown having inconsistent padding with input */
 .ui.small.selection.dropdown {
-  padding: .67857143em 3.2em .67857143em 1em;
+  padding: .67857143em 1.6em .67857143em 1em;
 }
 
 input:hover,