code duplication: fetchAppAvatar implemented twice #4

problem#

the fetchAppAvatar() function is completely duplicated in two files:

• static/app.js:9-38 (for user's app circles)
• static/login.js:78-99 (for atmosphere orbs)

identical logic maintained in two places, violating DRY principle.

impact#

• harder to maintain
• bug fixes need to be applied twice
• inconsistencies can creep in
• increased bundle size

affected files#

• static/app.js
• static/login.js