appview/repo: allow compare URLs to not be path escaped

this changes the routing logic slightly to allow non-path escaped refs
in compare urls that use the `...` syntax:

previously only this worked:

/compare/master/sl%2Fuvpzuszrulvq
/compare/master...sl%2Fuvpzuszrulvq

with this patch:

/compare/master/sl%2Fuvpzuszrulvq
/compare/master...sl%2Fuvpzuszrulvq
/compare/master...sl/uvpzuszrulvq (new)

Signed-off-by: oppiliappan <[e-mail]>

appview/pages/templates/repo/compare/compare.html

···
 {{ end }}
 
 {{ define "mainLayout" }}
-  <div class="px-1 col-span-full flex flex-col gap-4">
+  <div class="px-1 flex-grow col-span-full flex flex-col gap-4">
     {{ block "contentLayout" . }}
       {{ block "content" . }}{{ end }}
     {{ end }}

appview/repo/compare.go

···
 	}
 
 	// if user is navigating to one of
-	//   /compare/{base}/{head}
 	//   /compare/{base}...{head}
-	base := chi.URLParam(r, "base")
-	head := chi.URLParam(r, "head")
-	if base == "" && head == "" {
-		rest := chi.URLParam(r, "*") // master...feature/xyz
-		parts := strings.SplitN(rest, "...", 2)
-		if len(parts) == 2 {
-			base = parts[0]
-			head = parts[1]
-		}
+	//   /compare/{base}/{head}
+	var base, head string
+	rest := chi.URLParam(r, "*")
+
+	var parts []string
+	if strings.Contains(rest, "...") {
+		parts = strings.SplitN(rest, "...", 2)
+	} else if strings.Contains(rest, "/") {
+		parts = strings.SplitN(rest, "/", 2)
+	}
+
+	if len(parts) == 2 {
+		base = parts[0]
+		head = parts[1]
 	}
 
 	base, _ = url.PathUnescape(base)

appview/repo/router.go

···
 		// for example:
 		//   /compare/master...some/feature
 		//   /compare/master...example.com:another/feature <- this is a fork
-		r.Get("/{base}/{head}", rp.Compare)
 		r.Get("/*", rp.Compare)
 	})