fix(settings): stop profile refreshes from wiping in-progress account edits

WHY THIS MATTERS
Replicated live during the PR #365 review: type a new Display Name,
tab into Organisation (blur fires the name autosave), and keep typing.
When the name PATCH resolves, the Organisation input snaps back to the
stored server value mid-keystroke and the typed text is gone - while
the field is still focused.

WHAT IS A HYDRATION-EFFECT CLOBBER
The page keeps local input state and "hydrates" it from the profile
context in an effect. The old effect wrote BOTH fields whenever EITHER
profile value changed. Saving one field on blur refreshes the whole
profile object, so the effect re-ran and overwrote the sibling input
with the (stale) server value. This was latent before this PR - with
click-to-save, a profile refresh never landed while the user was
typing in the other field; blur-autosave made the race the common
case, and this PR also removed the truthiness guard that used to
soften it.

HOW THE FIX WORKS
The single combined effect becomes two effects, each keyed only to its
own profile value, and each skips syncing while its input is the
active element - the profile can never overwrite what the user is
currently typing. When the field blurs, its own save handler reads the
input state directly, so nothing is lost by skipping the sync.

A regression test drives the real sequence (type name -> focus
organisation -> type -> name save resolves with a refreshed profile)
and asserts both inputs keep their typed values.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RuPCULDYgVsiCanRgbEy6W