fix(user): the page retries partial saves and survives leaving mid-save

A key whose write half-failed (AccountsService took it, git did not)
reloads as unchanged and Save went dead. A key with an error now counts
as changed, and editing a field clears its error.

Processes were parented to the page, so leaving it mid-save killed
userctl between stores. They hang off the module now, passed in as
owner (not the module's id, which would bind to itself).

busy now clears when the reload lands, so Save cannot be clicked again
before saved is fresh, and the fields and avatar picker are disabled
while busy.

Avatar paths with # or % broke the preview under a bare file:// prefix;
each segment is now URI-encoded for the Image source (page and row),
while draft.avatar stays a plain path for userctl. Dropped a redundant
saved clear in load.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

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