Inconsistencies: altCongestionColorsAtom leaks its variable name into localStorage

[dcblundell]

• atomWithStorage key naming. Most persisted atoms use stable, short camelCase keys ('showHex', 'showMemoryRegions', 'renderMemoryLayout', 'showBufferSummary') decoupled from the atom variable name. altCongestionColorsAtom (src/store/app.ts:88) leaks its variable name into localStorage ('altCongestionColorsAtom'). Don't replicate — renaming an atom later would orphan persisted settings.