everyday my macbook air m2 drop 1 percent battery capacity 91 cycle count maximum capacity is 95 what is issue or this is a normal

A battery dropping 1% in one day under no load conditions is normal. Self discharge rates for modern batteries is 0.5% to 3% per day.

Whether 95% is good or not depends on the age of your Mac. If it's 2 days old, that's not so good; if's 2 years old that's very good. You didn't say what year your Mac is.

Battery degradation is neither predictable nor linear.