feat: finalise multi-profil Codex/Claude avec catalogue de modèles

- Backend : clone_profile_from_seed généralisé (non OpenCode)
- Backend : catalogue static Claude/Codex (3 modèles chacun, 1 recommandé)
- Backend : commandes Tauri list_claude_models/list_codex_models
- Frontend : ProfilesSettings refonte en onglets Codex/Claude + create/duplicate/edit/delete
- Frontend : ModelSelect searchable partagé + fallback saisie manuelle
- Frontend : assignation agent nom · modèle
- Tests QA : 4 profils modèles distincts (2 Claude, 2 Codex) assignés à agents

crates/application/src/agent/usecases.rs

@@ -146,6 +146,92 @@ pub struct SaveProfileOutput {
     pub profile: AgentProfile,
 }
 
+// ---------------------------------------------------------------------------
+// CloneProfileFromSeed
+// ---------------------------------------------------------------------------
+
+/// Input for [`CloneProfileFromSeed::execute`].
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct CloneProfileFromSeedInput {
+    /// Id of the persisted or reference profile to clone.
+    pub seed_profile_id: ProfileId,
+    /// Optional display name for the cloned profile. When absent, a copy label is
+    /// derived from the seed name.
+    pub name: Option<String>,
+    /// Optional model override. When absent, the seed model is copied as-is.
+    pub model: Option<String>,
+}
+
+/// Output of [`CloneProfileFromSeed::execute`].
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct CloneProfileFromSeedOutput {
+    /// The newly persisted profile.
+    pub profile: AgentProfile,
+}
+
+/// Creates a new profile instance from an existing persisted/reference seed.
+///
+/// Persisted profiles are preferred over reference seeds so user edits to the
+/// seed are preserved. The clone always receives a fresh [`ProfileId`] from the
+/// backend [`IdGenerator`]; callers can override the display name and model
+/// without minting ids client-side.
+pub struct CloneProfileFromSeed {
+    store: Arc<dyn ProfileStore>,
+    ids: Arc<dyn IdGenerator>,
+}
+
+impl CloneProfileFromSeed {
+    /// Builds the use case from the profile store and id generator ports.
+    #[must_use]
+    pub fn new(store: Arc<dyn ProfileStore>, ids: Arc<dyn IdGenerator>) -> Self {
+        Self { store, ids }
+    }
+
+    /// Clones the requested seed into a new persisted profile.
+    ///
+    /// # Errors
+    /// [`AppError::NotFound`] if no persisted/reference profile has the seed id,
+    /// [`AppError::Invalid`] if `name` or `model` is blank, [`AppError::Store`]
+    /// on persistence failure.
+    pub async fn execute(
+        &self,
+        input: CloneProfileFromSeedInput,
+    ) -> Result<CloneProfileFromSeedOutput, AppError> {
+        let existing = self.store.list().await?;
+        let seed = existing
+            .iter()
+            .find(|profile| profile.id == input.seed_profile_id)
+            .cloned()
+            .or_else(|| {
+                reference_profiles()
+                    .into_iter()
+                    .find(|profile| profile.id == input.seed_profile_id)
+            })
+            .ok_or(AppError::NotFound("profile seed not found".into()))?;
+
+        let mut profile = seed;
+        profile.id = fresh_profile_id(&*self.ids, &existing)?;
+        profile.name = match input.name {
+            Some(name) => {
+                if name.trim().is_empty() {
+                    return Err(AppError::Invalid("profile.name must not be empty".into()));
+                }
+                name
+            }
+            None => format!("{} copy", profile.name),
+        };
+        if let Some(model) = input.model {
+            if model.trim().is_empty() {
+                return Err(AppError::Invalid("profile.model must not be empty".into()));
+            }
+            profile.model = Some(model);
+        }
+
+        self.store.save(&profile).await?;
+        Ok(CloneProfileFromSeedOutput { profile })
+    }
+}
+
 // ---------------------------------------------------------------------------
 // CloneOpenCodeProfileFromSeed
 // ---------------------------------------------------------------------------