I'm sorry that you have been upset by what has happenend at your work. I try to use the mantra in life that "if you can't change something change your reaction to it." In your situation I would do whatever made it easier for me to cope with. Personally I wouldn't be taking photos or gathering any evidence as this is all very negative and I wouldn't want to end my working days on such a sour note. If you have such a wealth of knowledge and expertise much better to be remembered for having done a brilliant suporting role and handover- than for causing unpleasantness.
I feel terribly sorry for the young these days - its difficult for them to get experience in the 1st place, and with pension ages being raised promotions can be delayed because we have a bulge at the other end. Add to this that they have been locked down to protect the elderly and infirmed and I think we owe them a debt of gratitude.
When we went into the work place there were jobs available and if you wanted to work you could its not the same now and hasn't been for some years.
Be kind to yourself and don't turn this into a battle.
Accents - a privilege to hear them

