Four defects, all from one design mistake: a profile's display name and its
filename were the same string.
- Saving the logged-in account made a SECOND profile of an account another
profile already held. Both then reported themselves active, so there was
nothing to switch between. `POST /profiles` now refuses `EDUPLICATE` and
names the profile that already holds the account. Re-saving into the
account's own profile stays allowed - that is the token-refresh path.
- Worse, an accidental duplicate could not be cleaned up: two profiles of one
account are both active, and the delete guard refused any active profile, so
neither was ever deletable. The guard now blocks only the LAST saved copy of
the live account, which is the actual credential-loss condition it exists
for. The trash button had to follow, or the server would allow what the UI
hid.
- A name could not contain spaces or diacritics, because it had to be
filename-safe. A profile now carries `name` (internal identifier, still the
filename, still what every route takes) and `label` (what the user reads and
edits: 1-60 free-form characters, control characters rejected, stored
trimmed, unique case-insensitively). A label never touches a path, which is
what makes "Tài khoản chính" a legal name.
- Naming happened up front in a "save current account as" field. That field is
gone. The server derives the identifier, the save button lives on the live
account's card and appears only while it is unsaved, and the label is edited
by clicking it (Enter saves, Escape cancels).
Renaming rewrites the label in place and deliberately does NOT move `name`, so
it cannot half-fail and leave a profile unreachable. Profiles written before
labels existed report `label` equal to their `name`, so nothing needs migrating.
Adds `PATCH /api/cc-config/profiles`; `POST` now takes an optional `name`.
Verified: server 1431/1431 (11 new), client 459/459, tsc clean. Also exercised
end to end against a COPY of the real profile store on this machine: the
duplicate deleted, the last copy still refused, a Vietnamese label accepted,
and the stored access/refresh tokens and 0600 mode intact after a rename.
nntrivi2001
11dcc04ac4