It sounds like you want to smarten up the lights but still keep the normal dumb switches, which makes sense. That is easily done, but it’ll be the most expensive option.
Like others have said, I would go with Hue throughout which gives you full control of the lights (depending of course on which bulb you go for). Other smart bulbs will work as well, but with the Hue hub you’ll keep the lights on their own Zigbee mesh, the Hue hub is well supported by HE and the Hue app is excellent.
To be able to use normal light switches with smart lights that are not supposed to have the power to them turned off, I would use in-wall Aeotec Nano switches. You will need one per light circuit/light switch or you get the Aeotec Dual Nano switch which can do 2 circuits/light switches. The Nanos will be installed in the flush box behind the light switch and will be connected to the light switch (but not the lighting circuit because you don’t want them to physically turn off the power to the lights). The light switches will only be connected to the Nanos (because again, you don’t want the power actually turned off) so the light switches will only act as a switch input to the Nanos and there will be no mains power required to be run to the light switches.
In HE you would set up your automation to wait for the Nanos to report that the switch has been pressed and then HE will tell Hue which lights to turn on.
Now, that’s the expensive way of making a traditional light switch smart, but it will work (there will be a slight delay before the lights turn on/off so it won’t be the normal instant action you’d see from a normal light switch). The other way is to replace the traditional light switch and Nano with a wireless Zigbee or Zwave wall switch instead. That will be the cheaper option but the you are also relying on battery powered wall switches (which can be a pain with their batteries needing replacement). On the other hand, if you go down the Nano path you will have a strong Zwave mesh in the house for other Zwave devices to use.
The world is you oyster! You can do anything you’d like. It just comes down to money