Toenail reconstruction for a permanently damaged toenail

Q: I am a Muslim woman and have a permanently damaged toenail due to trauma. Although it is not causing physical problems, the appearance of the nail causes me significant embarrassment and distress and affects my confidence. 

I am getting married soon and would like to know whether it is permissible to use a cosmetic toenail reconstruction or similar treatment to restore the appearance of the damaged nail. My intention is not simply beautification, but to conceal and correct a defect that resulted from injury and that causes me considerable emotional distress. 

If such a treatment forms a layer over the nail, how would this affect the validity of wudu? Is there any allowance in this situation, or would it need to be removed for wudu?

Calling interest "service charge"

Q: There is a government youth development department here. There is a loan project and it was declared on the terms 9% service charge for women with no Riba. 

9% at gradually low rate. 

Is working as a youth development officer halaal there or taking the loan? 

It’s a charitable government department but yet there is that 10% service charge for men, 9% service charge for women, etc. rate for other gender.

Having love for Hazrat Muaawiyah (radhiyallahu ‘anhu) and all the Sahaabah (radhiyallahu ‘anhum)

Q: A few days ago, Salmaan Nadwi of India passed away. Some people were praising him, whereas he was a person who spoke ill of the Sahaabah (radhiyallahu ‘anhum) – especially Hazrat Muaawiyah (radhiyallahu ‘anhu). He made many derogatory statements about Hazrat Muaawiyah (radhiyallahu ‘anhu) and disgraced him. Is it permissible to praise this man seeing that he reviled the Sahaabah (radhiyallahu ‘anhum) and Hazrat Muaawiyah (radhiyallahu ‘anhu), and he showed them great disrespect until the end of his life?

Reading four rakaats nafl salaah after the fardh of Esha

Q: I heard that 4 rakaats after Esha is equal to Tahajjud Salaah on Laylatul-Qadr. I wanted to know what's the tarteeb of reading these 4 Rakaats, is it 2 Sunnah and 2 Nafl before Witr or is it 2 Sunnah then 2 Nafl and another 2 nafl then Witr or is it 2 Sunnah and 4 Nafl with one Salaam and then Witr? 

Also, what will be the count of the Esha Rakaats taking into consideration either 4 or 2 Rakaats before, these 4 mentioned in the Hadith and also the 2 Rakaats sitting after Witr?

Buying a bag of goods without knowing its contents

Q: There is a app called Refreshi, this is how it works, you pay a certain amount and get a bag of food/dessert etc... but you don't know exactly what. This is how it is written. 

"Enjoy a tasty mix of baked goods. R68 You could receive, donuts, croissants, danishes, and/or pastries. Every bag is a surprise and delight to your tastebuds." 

Is this permissible?