fix(core,gui,cli): a blocked sign-in no longer asks to update the app (B209)

Proton answers a sign-in it blocks for abuse or rate limits with code
2028 and the text "This version of the app is no longer supported". The
SDK read 2028 as Unknown, so the app passed that text through and told
users to update a current release (issues #28, #39).

- deps: proton-sdk and proton-drive-rs 0.8.3, which name 2028 Blocked
- core: error::sign_in_blocked detects it
- gui: the login page says Proton is refusing sign-in for now and that
  waiting helps, translated in every catalog
- cli: pdfs login adds the same hint to the error
- cli: pdfs diagnose warns instead of failing when cache.db does not
  exist yet; the daemon creates it after the first sign-in
- docs: BUGS.md B209, changelog, troubleshooting entry

po/fr.po

@@ -5,7 +5,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: proton-drive-linux 2.1.0\n"
 "Report-Msgid-Bugs-To: https://github.com/narrrl/proton-drive-linux/issues\n"
-"POT-Creation-Date: 2026-10-11 23:47+0200\n"
+"POT-Creation-Date: 2026-10-13 18:38+0200\n"
 "PO-Revision-Date: 2026-09-23 12:00+0200\n"
 "Last-Translator: Proton Drive for Linux contributors\n"
 "Language-Team: French\n"
@@ -258,9 +258,9 @@ msgstr ""
 #: crates/pdfs-gui/src/app/pages/locations.rs:1054
 #: crates/pdfs-gui/src/app/pages/locations.rs:1529
 #: crates/pdfs-gui/src/app/pages/locations.rs:1579
-#: crates/pdfs-gui/src/app/pages/login.rs:389
-#: crates/pdfs-gui/src/app/pages/login.rs:503
-#: crates/pdfs-gui/src/app/pages/login.rs:549
+#: crates/pdfs-gui/src/app/pages/login.rs:394
+#: crates/pdfs-gui/src/app/pages/login.rs:508
+#: crates/pdfs-gui/src/app/pages/login.rs:554
 #: crates/pdfs-gui/src/app/pages/photos.rs:2058
 #: crates/pdfs-gui/src/app/pages/shared.rs:939
 #: crates/pdfs-gui/src/app/pages/shared.rs:1020
@@ -3268,12 +3268,19 @@ msgid "Too many sign-in attempts. Wait a few minutes and try again."
 msgstr ""
 "Trop de tentatives de connexion. Patientez quelques minutes et réessayez."
 
-#: crates/pdfs-gui/src/app/pages/login.rs:234
+#: crates/pdfs-gui/src/app/pages/login.rs:233
+msgid ""
+"Proton is temporarily refusing sign-in from this device. Your app version is "
+"not the problem. Wait several hours, up to a day, without trying again, then "
+"sign in."
+msgstr "Proton refuse temporairement la connexion depuis cet appareil. La version de l’application n’est pas en cause. Patientez plusieurs heures, jusqu’à un jour, sans réessayer, puis connectez-vous."
+
+#: crates/pdfs-gui/src/app/pages/login.rs:239
 msgid "Couldn't reach Proton. Check your internet connection and try again."
 msgstr ""
 "Impossible de joindre Proton. Vérifiez votre connexion Internet et réessayez."
 
-#: crates/pdfs-gui/src/app/pages/login.rs:237
+#: crates/pdfs-gui/src/app/pages/login.rs:242
 msgid ""
 "Signed in, but the session couldn't be saved to the system keyring. Make "
 "sure a keyring (GNOME Keyring or KWallet) is running and unlocked."
@@ -3282,21 +3289,21 @@ msgstr ""
 "système. Assurez-vous qu’un trousseau (GNOME Keyring ou KWallet) est en "
 "cours d’exécution et déverrouillé."
 
-#: crates/pdfs-gui/src/app/pages/login.rs:240
+#: crates/pdfs-gui/src/app/pages/login.rs:245
 msgid "Sign-in cancelled: no two-factor code was entered."
 msgstr "Connexion annulée : aucun code à deux facteurs n’a été saisi."
 
-#: crates/pdfs-gui/src/app/pages/login.rs:243
+#: crates/pdfs-gui/src/app/pages/login.rs:248
 msgid "Sign-in cancelled: no mailbox password was entered."
 msgstr ""
 "Connexion annulée : aucun mot de passe de boîte aux lettres n’a été saisi."
 
-#: crates/pdfs-gui/src/app/pages/login.rs:246
+#: crates/pdfs-gui/src/app/pages/login.rs:251
 msgid "That mailbox password didn't unlock your account."
 msgstr ""
 "Ce mot de passe de boîte aux lettres n’a pas déverrouillé votre compte."
 
-#: crates/pdfs-gui/src/app/pages/login.rs:249
+#: crates/pdfs-gui/src/app/pages/login.rs:254
 msgid ""
 "Sign-in cancelled: the verification wasn't completed. Sign in again to get a "
 "new one."
@@ -3305,37 +3312,37 @@ msgstr ""
 "pour en obtenir une nouvelle."
 
 #. Translators: {error} is an error message, usually in English.
-#: crates/pdfs-gui/src/app/pages/login.rs:254
+#: crates/pdfs-gui/src/app/pages/login.rs:259
 #, rust-format
 msgid "Sign-in failed: {error}"
 msgstr "Échec de la connexion : {error}"
 
-#: crates/pdfs-gui/src/app/pages/login.rs:365
+#: crates/pdfs-gui/src/app/pages/login.rs:370
 msgid "That mailbox password didn't unlock your account. Try again."
 msgstr ""
 "Ce mot de passe de boîte aux lettres n’a pas déverrouillé votre compte. "
 "Réessayez."
 
-#: crates/pdfs-gui/src/app/pages/login.rs:367
+#: crates/pdfs-gui/src/app/pages/login.rs:372
 msgid ""
 "This account has a separate mailbox password. Enter it to unlock your files."
 msgstr ""
 "Ce compte a un mot de passe de boîte aux lettres distinct. Saisissez-le pour "
 "déverrouiller vos fichiers."
 
-#: crates/pdfs-gui/src/app/pages/login.rs:370
+#: crates/pdfs-gui/src/app/pages/login.rs:375
 msgid "Mailbox Password"
 msgstr "Mot de passe de la boîte aux lettres"
 
-#: crates/pdfs-gui/src/app/pages/login.rs:376
+#: crates/pdfs-gui/src/app/pages/login.rs:381
 msgid "Mailbox password"
 msgstr "Mot de passe de la boîte aux lettres"
 
-#: crates/pdfs-gui/src/app/pages/login.rs:380
+#: crates/pdfs-gui/src/app/pages/login.rs:385
 msgid "Keep unlocked on this computer"
 msgstr "Garder déverrouillé sur cet ordinateur"
 
-#: crates/pdfs-gui/src/app/pages/login.rs:382
+#: crates/pdfs-gui/src/app/pages/login.rs:387
 msgid ""
 "Stores the unlock in the system keyring, so Proton Drive opens without "
 "asking after every login. Otherwise you enter the password once per session."
@@ -3344,50 +3351,50 @@ msgstr ""
 "Proton Drive s’ouvre sans demande après chaque connexion. Sinon, vous "
 "saisissez le mot de passe une fois par session."
 
-#: crates/pdfs-gui/src/app/pages/login.rs:390
-#: crates/pdfs-gui/src/app/pages/login.rs:443
+#: crates/pdfs-gui/src/app/pages/login.rs:395
+#: crates/pdfs-gui/src/app/pages/login.rs:448
 msgid "Unlock"
 msgstr "Déverrouiller"
 
-#: crates/pdfs-gui/src/app/pages/login.rs:442
+#: crates/pdfs-gui/src/app/pages/login.rs:447
 msgid "Proton Drive is locked. Enter your mailbox password to unlock it."
 msgstr ""
 "Proton Drive est verrouillé. Saisissez votre mot de passe de boîte aux "
 "lettres pour le déverrouiller."
 
-#: crates/pdfs-gui/src/app/pages/login.rs:471
+#: crates/pdfs-gui/src/app/pages/login.rs:476
 msgid "Unlocked."
 msgstr "Déverrouillé."
 
-#: crates/pdfs-gui/src/app/pages/login.rs:476
+#: crates/pdfs-gui/src/app/pages/login.rs:481
 msgid "Couldn't unlock"
 msgstr "Impossible de déverrouiller"
 
-#: crates/pdfs-gui/src/app/pages/login.rs:489
+#: crates/pdfs-gui/src/app/pages/login.rs:494
 msgid "Two-Factor Authentication"
 msgstr "Authentification à deux facteurs"
 
-#: crates/pdfs-gui/src/app/pages/login.rs:491
+#: crates/pdfs-gui/src/app/pages/login.rs:496
 msgid ""
 "Enter the code from your authenticator app, or one of your recovery codes."
 msgstr ""
 "Saisissez le code de votre application d’authentification ou l’un de vos "
 "codes de récupération."
 
-#: crates/pdfs-gui/src/app/pages/login.rs:497
+#: crates/pdfs-gui/src/app/pages/login.rs:502
 msgid "Authentication code"
 msgstr "Code d’authentification"
 
-#: crates/pdfs-gui/src/app/pages/login.rs:504
+#: crates/pdfs-gui/src/app/pages/login.rs:509
 msgid "Confirm"
 msgstr "Confirmer"
 
 #
-#: crates/pdfs-gui/src/app/pages/login.rs:535
+#: crates/pdfs-gui/src/app/pages/login.rs:540
 msgid "Verify in Your Browser"
 msgstr "Vérifier dans le navigateur"
 
-#: crates/pdfs-gui/src/app/pages/login.rs:537
+#: crates/pdfs-gui/src/app/pages/login.rs:542
 msgid ""
 "The verification page can't be shown in the app on this system. Open it in "
 "your browser, complete it there, then come back and choose Continue."
@@ -3397,20 +3404,20 @@ msgstr ""
 "choisissez « Continuer »."
 
 #
-#: crates/pdfs-gui/src/app/pages/login.rs:543
+#: crates/pdfs-gui/src/app/pages/login.rs:548
 msgid "Open Verification Page"
 msgstr "Ouvrir la page de vérification"
 
 #
-#: crates/pdfs-gui/src/app/pages/login.rs:550
+#: crates/pdfs-gui/src/app/pages/login.rs:555
 msgid "Continue"
 msgstr "Continuer"
 
-#: crates/pdfs-gui/src/app/pages/login.rs:589
+#: crates/pdfs-gui/src/app/pages/login.rs:594
 msgid "Sign Out?"
 msgstr "Se déconnecter ?"
 
-#: crates/pdfs-gui/src/app/pages/login.rs:591
+#: crates/pdfs-gui/src/app/pages/login.rs:596
 msgid ""
 "Proton Drive will disconnect and stop syncing until you sign in again. Files "
 "already on this computer stay where they are."
@@ -3419,7 +3426,7 @@ msgstr ""
 "vous vous reconnectiez. Les fichiers déjà présents sur cet ordinateur "
 "restent en place."
 
-#: crates/pdfs-gui/src/app/pages/login.rs:593
+#: crates/pdfs-gui/src/app/pages/login.rs:598
 msgid "Sign Out"
 msgstr "Se déconnecter"