Support showing invalid entries in Freqman and allow minor edits (#1269)

* Support showing invalid entries in Freqman and allow minor edits
* Use light_grey instead of grey
* Fix comment
* Fix null in description bug
* Fix spacing in delete entry dialog
* trim in delete modal

firmware/test/application/test_string_format.cpp

@@ -47,3 +47,7 @@ TEST_CASE("trim removes whitespace.") {
 TEST_CASE("trim returns empty for only whitespace.") {
     CHECK(trim("  \n").empty());
 }
+
+TEST_CASE("trim empty returns empty.") {
+    CHECK(trim("").empty());
+}