feat(profile): selezione del profilo di cui vedere le sessioni (v0.5.0)

- Impostazioni > Sessions: selettore "Profile" (elenco da /api/profiles;
  "(server active)" come prima voce = nessun cookie di profilo)
- ApiClient: fetchProfiles() + switchProfile(); lo switch usa
  /api/profile/switch (process_wide=False lato server: il cookie firmato
  hermes_profile scopa le richieste dell'app per-client; il profilo attivo
  globale del server non viene toccato); refresh automatico delle sessioni
- CookieJar::removeCookiesByName per l'opzione "(server active)"
- Il profilo scelto viene riapplicato automaticamente dopo il login
- i18n: nuove stringhe tradotte it/fr/de

README.md

@@ -16,6 +16,8 @@ chat with your Hermes agent from the phone — and use it with your **voice**.
   read-aloud loop, auto-stopping on speech pauses (tunable)
 - **Localized UI**: English (source), Italian, French and German — follows
   the system language
+- **Profile selection**: pick which server profile's sessions to show
+  (Settings → Sessions; per-client via the WebUI signed cookie)
 - Cancel a running turn, resync from server state, cover page
 
 ## Requirements
@@ -35,6 +37,7 @@ requires a server address.
 | Setting | Meaning |
 |---|---|
 | Server | Hermes Web UI address, e.g. `https://hermes.example.com` (required) |
+| Profile | server profile whose sessions are shown (empty = server's active) |
 | Read-aloud voice / TTS engine | empty = server defaults |
 | Voice/engine presets | comma-separated lists used to fill the pickers |
 | Read replies aloud | auto-play every reply (off by default) |
@@ -73,6 +76,6 @@ speaks (validated live against a real instance).
 
 ## Status
 
-Version 0.4.0 — protocol and C++ core validated against a real `hermes-webui`
-(login, sessions, streaming chat, TTS, STT, voice dialog); UI in English,
-Italian, French and German; on-device testing still ongoing.
+Version 0.5.0 — protocol and C++ core validated against a real `hermes-webui`
+(login, sessions, streaming chat, TTS, STT, voice dialog, profile selection);
+UI in English, Italian, French and German; on-device testing still ongoing.