Allow CSV file upload in import flow (#986)

* Add .tool-versions to gitignore

* Add dropzone js for drag and drop file uploads

* UI for csv file uploads for import

* dropzone controller and use lucide_icon instead of svg

* Preview for file chosen

* File upload

* Remove dropzone

* Normalize I18n keys and fix lint issues

* Add system tests

* Cleanup

* Remove unwanted

test/support/import_test_helper.rb

@@ -1,6 +1,6 @@
 module ImportTestHelper
   def valid_csv_str
-    <<-ROWS
+    <<~ROWS
       date,name,category,tags,amount
       2024-01-01,Starbucks drink,Food & Drink,Tag1|Tag2,-8.55
       2024-01-01,Etsy,Shopping,Tag1,-80.98
@@ -10,14 +10,14 @@ module ImportTestHelper
   end
 
   def valid_csv_with_invalid_values
-    <<-ROWS
+    <<~ROWS
       date,name,category,tags,amount
       invalid_date,Starbucks drink,Food,,invalid_amount
     ROWS
   end
 
   def valid_csv_with_missing_data
-    <<-ROWS
+    <<~ROWS
       date,name,category,"optional id",amount
       2024-01-01,Drink,Food,1234,-200
       2024-01-02,,,,-100
@@ -25,7 +25,7 @@ module ImportTestHelper
   end
 
   def malformed_csv_str
-    <<-ROWS
+    <<~ROWS
       name,age
       "John Doe,23
       "Jane Doe",25