web_theme_classic: as user setting, instead of global on/off? #3234
Description
Is your feature request related to a problem?
Some people prefer the new Odoo style, others the old, especially those with restrictions in their eyesight.
Describe the solution you'd like
How about making the "classic theme" a setting on the user preference page, just like web_chatter_position
Describe alternatives you've considered
Using an accessiblity module like https://apps.odoo.com/apps/modules/18.0/odoo-allinoneaccessibility,
but no OCA solution exists currently on this?
Additional context
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