* fix(settings): allow clearing an encrypted provider API key
`update_encrypted_setting` skipped the write whenever the submitted value
was blank, so clearing the field (which auto-submits an empty value) never
removed the stored key — the masked "********" placeholder just reappeared
on re-render. This affected every encrypted provider key (Twelve Data,
Tiingo, EODHD, Alpha Vantage, Tinkoff).
Treat "********" as "leave unchanged" (the untouched masked placeholder)
but persist nil for an explicit blank submission, so a key can be removed
from the UI.
Closes#2465
* fix(settings): clear the remaining encrypted provider tokens on blank
Route openai_access_token, anthropic_access_token, and
external_assistant_token through update_encrypted_setting so blanking
any of them clears the stored value instead of silently retaining it —
same fix as the securities keys, completing the scope of #2465.
Add regression tests for clearing each token and for the OpenAI masked
placeholder, and reset the newly-touched keys in teardown.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
---------
Signed-off-by: Juan José Mata <juanjo.mata@gmail.com>
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Co-authored-by: Juan José Mata <juanjo.mata@gmail.com>
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