Merge branch 'main' into feature/chat-api

.github/workflows/consolidated-tests-ci.yml

@@ -121,6 +121,8 @@ jobs:
       UNSLOTH_IS_PRESENT: '1'
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
 
       - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
         with:
@@ -2013,6 +2015,8 @@ jobs:
       UNSLOTH_IS_PRESENT: '1'
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
 
       - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
         with:

.github/workflows/lint-ci.yml

@@ -44,6 +44,8 @@ jobs:
     timeout-minutes: 5
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
 
       - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
         with:

.github/workflows/mlx-ci.yml

@@ -100,6 +100,8 @@ jobs:
           egress-policy: audit
 
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
 
       - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
         with:

.github/workflows/notebooks-ci.yml

@@ -88,6 +88,7 @@ jobs:
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
         with:
           path: unsloth
+          persist-credentials: false
 
       - name: Checkout unslothai/notebooks @ ${{ env.NOTEBOOKS_REF }}
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
@@ -96,6 +97,7 @@ jobs:
           ref: ${{ env.NOTEBOOKS_REF }}
           path: notebooks
           fetch-depth: 0  # drift check needs git status / diff
+          persist-credentials: false
 
       - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
         with:
@@ -196,12 +198,15 @@ jobs:
             exit 1
           fi
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
         with: { path: unsloth }
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
         with:
           repository: unslothai/notebooks
           ref: ${{ env.NOTEBOOKS_REF }}
           path: notebooks
+          persist-credentials: false
       - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
         with: { python-version: '3.12', cache: 'pip' }
       - name: Install
@@ -239,12 +244,15 @@ jobs:
             exit 1
           fi
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
         with: { path: unsloth }
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
         with:
           repository: unslothai/notebooks
           ref: ${{ env.NOTEBOOKS_REF }}
           path: notebooks
+          persist-credentials: false
       - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
         with: { python-version: '3.12', cache: 'pip' }
 
@@ -342,12 +350,15 @@ jobs:
             exit 1
           fi
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
         with: { path: unsloth }
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
         with:
           repository: unslothai/notebooks
           ref: ${{ env.NOTEBOOKS_REF }}
           path: notebooks
+          persist-credentials: false
       - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
         with: { python-version: '3.12' }
 

.github/workflows/release-desktop.yml

@@ -36,6 +36,8 @@ jobs:
 
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd
+        with:
+          persist-credentials: false
 
       - name: Validate release versions
         id: prepare
@@ -343,6 +345,8 @@ jobs:
           egress-policy: audit
 
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd
+        with:
+          persist-credentials: false
 
       # ── Linux dependencies ──
       - name: Install Linux dependencies

.github/workflows/security-audit.yml

@@ -127,6 +127,7 @@ jobs:
           # Full history so TruffleHog can diff base..head; without
           # this it sees only the latest commit and reports nothing.
           fetch-depth: 0
+          persist-credentials: false
 
       - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
         with:
@@ -722,6 +723,8 @@ jobs:
             files.pythonhosted.org:443
 
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
 
       - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
         with:
@@ -893,6 +896,8 @@ jobs:
             registry.npmjs.org:443
 
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
 
       - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
         with:
@@ -963,6 +968,8 @@ jobs:
             files.pythonhosted.org:443
 
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
 
       - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
         with:
@@ -998,6 +1005,8 @@ jobs:
             files.pythonhosted.org:443
 
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
 
       - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
         with:
@@ -1052,6 +1061,7 @@ jobs:
           # Need the base commit accessible for `git show
           # <base-sha>:studio/frontend/package-lock.json` below.
           fetch-depth: 0
+          persist-credentials: false
 
       - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e  # v6.4.0
         with:

.github/workflows/studio-api-smoke.yml

@@ -51,6 +51,8 @@ jobs:
       HF_HOME: ${{ github.workspace }}/hf-cache
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
 
       - name: Linux deps
         run: |

.github/workflows/studio-backend-ci.yml

@@ -53,6 +53,8 @@ jobs:
         python: ['3.10', '3.11', '3.12', '3.13']
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
 
       - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
         with:
@@ -106,6 +108,8 @@ jobs:
     timeout-minutes: 15
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
 
       - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
         with:

.github/workflows/studio-frontend-ci.yml

@@ -36,6 +36,8 @@ jobs:
         working-directory: studio/frontend
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
 
       # FIXME: drop this step once @assistant-ui/* and assistant-stream
       # leave 0.x -- on 1.x, caret ranges are conventional. Until then,

.github/workflows/studio-inference-smoke.yml

@@ -67,6 +67,8 @@ jobs:
       HF_HOME: ${{ github.workspace }}/hf-cache
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
 
       - name: Linux deps for llama.cpp prebuilt
         run: |
@@ -315,6 +317,8 @@ jobs:
       STUDIO_PORT: '18889'
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
 
       - name: Linux deps for llama.cpp prebuilt
         run: |
@@ -632,6 +636,8 @@ jobs:
       HF_HOME: ${{ github.workspace }}/hf-cache
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
 
       - name: Linux deps for llama.cpp prebuilt
         run: |

.github/workflows/studio-mac-api-smoke.yml

@@ -44,6 +44,8 @@ jobs:
       HF_HOME: ${{ github.workspace }}/hf-cache
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
 
       - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e  # v6.4.0
         with:

.github/workflows/studio-mac-inference-smoke.yml

@@ -67,6 +67,8 @@ jobs:
       HF_HOME: ${{ github.workspace }}/hf-cache
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
 
       - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e  # v6.4.0
         with:
@@ -315,6 +317,8 @@ jobs:
       STUDIO_PORT: '18898'
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
 
       - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e  # v6.4.0
         with:
@@ -680,6 +684,8 @@ jobs:
       HF_HOME: ${{ github.workspace }}/hf-cache
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
 
       - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e  # v6.4.0
         with:

.github/workflows/studio-mac-ui-smoke.yml

@@ -44,6 +44,8 @@ jobs:
       HF_HOME: ${{ github.workspace }}/hf-cache
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
 
       - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e  # v6.4.0
         with:

.github/workflows/studio-mac-update-smoke.yml

@@ -46,6 +46,8 @@ jobs:
     timeout-minutes: 30
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
 
       - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e  # v6.4.0
         with:

.github/workflows/studio-tauri-smoke.yml

@@ -40,6 +40,8 @@ jobs:
     timeout-minutes: 25
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
 
       - name: Linux native deps for Tauri / WebKit2GTK
         run: |

.github/workflows/studio-ui-smoke.yml

@@ -52,6 +52,8 @@ jobs:
       HF_HOME: ${{ github.workspace }}/hf-cache
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
 
       - name: Linux deps
         run: |

.github/workflows/studio-update-smoke.yml

@@ -40,6 +40,8 @@ jobs:
     timeout-minutes: 15
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
 
       - name: Linux deps for llama.cpp prebuilt
         run: |

.github/workflows/studio-windows-api-smoke.yml

@@ -52,6 +52,8 @@ jobs:
       PYTHONUTF8: '1'
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
 
       - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e  # v6.4.0
         with:

.github/workflows/studio-windows-inference-smoke.yml

@@ -62,6 +62,8 @@ jobs:
       PYTHONUTF8: '1'
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
 
       - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e  # v6.4.0
         with:
@@ -388,6 +390,8 @@ jobs:
       PYTHONUTF8: '1'
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
 
       - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e  # v6.4.0
         with:
@@ -796,6 +800,8 @@ jobs:
       PYTHONUTF8: '1'
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
 
       - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e  # v6.4.0
         with:

.github/workflows/studio-windows-ui-smoke.yml

@@ -57,6 +57,8 @@ jobs:
       PYTHONUTF8: '1'
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
 
       - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e  # v6.4.0
         with:

.github/workflows/studio-windows-update-smoke.yml

@@ -58,6 +58,8 @@ jobs:
       PYTHONUTF8: '1'
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
 
       - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e  # v6.4.0
         with:

.github/workflows/version-compat-ci.yml

@@ -58,6 +58,8 @@ jobs:
     timeout-minutes: 12
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
       - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
         with:
           python-version: '3.12'
@@ -83,6 +85,8 @@ jobs:
     timeout-minutes: 10
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
       - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
         with:
           python-version: '3.12'
@@ -107,6 +111,8 @@ jobs:
     timeout-minutes: 8
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
       - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
         with:
           python-version: '3.12'
@@ -129,6 +135,8 @@ jobs:
     timeout-minutes: 8
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
       - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
         with:
           python-version: '3.12'
@@ -151,6 +159,8 @@ jobs:
     timeout-minutes: 8
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
       - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
         with:
           python-version: '3.12'
@@ -173,6 +183,8 @@ jobs:
     timeout-minutes: 12
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
       - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
         with:
           python-version: '3.12'
@@ -200,6 +212,8 @@ jobs:
     timeout-minutes: 15
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
         with: { path: unsloth }
       - name: Clone unsloth-zoo @ main
         run: |
@@ -279,6 +293,8 @@ jobs:
     timeout-minutes: 20
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
       - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
         with:
           python-version: '3.12'

.github/workflows/wheel-smoke.yml

@@ -42,6 +42,8 @@ jobs:
     timeout-minutes: 15
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+        with:
+          persist-credentials: false
 
       - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e  # v6.4.0
         with:

studio/backend/main.py

@@ -284,7 +284,7 @@ def _build_csp(script_nonce: "str | None" = None) -> str:
         "img-src 'self' data: blob: https://t0.gstatic.com "
         "https://t1.gstatic.com https://t2.gstatic.com "
         "https://t3.gstatic.com; "
-        "connect-src 'self'; "
+        "connect-src 'self' https://huggingface.co https://datasets-server.huggingface.co; "
         "style-src 'self' 'unsafe-inline'; "
         f"{script_src}; "
         "font-src 'self' data:; "

studio/backend/models/training.py

@@ -130,20 +130,23 @@ class TrainingStartRequest(BaseModel):
     @field_validator("num_epochs")
     @classmethod
     def _check_num_epochs(cls, v: int) -> int:
+        # 0 is a sentinel meaning "use max_steps instead"; the frontend's
+        # steps-vs-epochs toggle sends it.
         if v is None:
             return 1
-        if v < 1 or v > _MAX_EPOCHS:
-            raise ValueError(f"num_epochs must be in [1, {_MAX_EPOCHS}] (got {v!r})")
+        if v < 0 or v > _MAX_EPOCHS:
+            raise ValueError(f"num_epochs must be in [0, {_MAX_EPOCHS}] (got {v!r})")
         return v
 
     @field_validator("max_steps")
     @classmethod
-    def _check_max_steps(cls, v):
+    def _check_max_steps(cls, v: Optional[int]) -> Optional[int]:
+        # 0 is the frontend's sentinel for "use num_epochs instead".
         if v is None:
             return v
-        if not isinstance(v, int) or v < 1 or v > _MAX_STEPS:
+        if not isinstance(v, int) or v < 0 or v > _MAX_STEPS:
             raise ValueError(
-                f"max_steps must be a positive int <= {_MAX_STEPS} (got {v!r})"
+                f"max_steps must be a non-negative int <= {_MAX_STEPS} (got {v!r})"
             )
         return v
 
@@ -158,7 +161,7 @@ class TrainingStartRequest(BaseModel):
 
     @field_validator("warmup_steps")
     @classmethod
-    def _check_warmup_steps(cls, v):
+    def _check_warmup_steps(cls, v: Optional[int]) -> Optional[int]:
         if v is None:
             return v
         if not isinstance(v, int) or v < 0 or v > _MAX_STEPS:
@@ -321,6 +324,16 @@ class TrainingStartRequest(BaseModel):
         description = "Physical GPU indices to use, for example [0, 1]. Omit or pass [] to use automatic selection. Explicit gpu_ids are unsupported when the parent CUDA_VISIBLE_DEVICES uses UUID/MIG entries.",
     )
 
+    @model_validator(mode = "after")
+    def _check_steps_or_epochs(self) -> "TrainingStartRequest":
+        # num_epochs and max_steps each accept 0 as a "use the other one"
+        # sentinel. If both resolve to 0 there's nothing to train against.
+        if (self.max_steps is None or self.max_steps == 0) and self.num_epochs == 0:
+            raise ValueError(
+                "Either num_epochs or max_steps must be > 0; both cannot be 0."
+            )
+        return self
+
 
 class TrainingJobResponse(BaseModel):
     """Immediate response when training is initiated"""

studio/frontend/src/components/assistant-ui/reasoning.tsx

@@ -19,10 +19,8 @@ import {
   useAuiState,
 } from "@assistant-ui/react";
 import { copyToClipboard } from "@/lib/copy-to-clipboard";
-import { Idea01Icon } from "@hugeicons/core-free-icons";
-import { HugeiconsIcon } from "@hugeicons/react";
 import { type VariantProps, cva } from "class-variance-authority";
-import { ChevronDownIcon, CopyIcon, CheckIcon } from "lucide-react";
+import { CheckIcon, ChevronDownIcon, CopyIcon, LightbulbIcon } from "lucide-react";
 import {
   type CSSProperties,
   type ComponentProps,
@@ -128,10 +126,7 @@ function ReasoningTrigger({
       )}
       {...props}
     >
-      <HugeiconsIcon
-        icon={Idea01Icon}
-        className="aui-reasoning-trigger-icon size-4 shrink-0"
-      />
+      <LightbulbIcon className="aui-reasoning-trigger-icon size-4 shrink-0" />
       <span
         data-slot="reasoning-trigger-label"
         className="aui-reasoning-trigger-label-wrapper relative inline-block leading-none"

studio/frontend/src/components/assistant-ui/thread.tsx

@@ -213,13 +213,28 @@ const ThreadScrollToBottom: FC = () => {
 };
 
 const ThreadWelcome: FC<{ hideComposer?: boolean }> = ({ hideComposer }) => {
+  const [currentEmoji, setCurrentEmoji] = useState("large sloth drink.png");
+
+  useEffect(() => {
+    const hour = new Date().getHours();
+    if (hour >= 6 && hour < 12) setCurrentEmoji("large sloth drink.png");
+    else if (hour >= 12 && hour < 17) setCurrentEmoji("sloth magnify final.png");
+    else if (hour >= 17 && hour < 21) setCurrentEmoji("sloth shy large.png");
+    else setCurrentEmoji("unsloth-gem.png");
+  }, []);
+
+  const currentEmojiSrc =
+    currentEmoji === "unsloth-gem.png"
+      ? `/${currentEmoji}`
+      : `/Sloth emojis/${currentEmoji}`;
+
   return (
     <div className="aui-thread-welcome-root mx-auto my-auto flex w-full max-w-(--thread-max-width) grow flex-col">
       <div className="aui-thread-welcome-center flex w-full grow flex-col items-center justify-center pb-[48px]">
         <div className="aui-thread-welcome-message flex w-full flex-col justify-center gap-6 px-4">
           <div className="flex flex-col items-center gap-2 text-center">
             <img
-              src="/Sloth emojis/sloth pc square.png"
+              src={currentEmojiSrc}
               alt="Sloth mascot"
               className="size-20"
             />

studio/frontend/src/features/training/api/train-api.ts

@@ -17,10 +17,41 @@ function isAbortError(error: unknown): boolean {
   return error instanceof DOMException && error.name === "AbortError";
 }
 
+type FastApiValidationError = {
+  loc?: unknown[];
+  msg?: string;
+};
+
+function formatDetail(detail: unknown): string | null {
+  if (typeof detail === "string" && detail) return detail;
+  if (!Array.isArray(detail)) return null;
+  const parts = detail
+    .map((entry) => {
+      if (!entry || typeof entry !== "object") return "";
+      const { loc, msg } = entry as FastApiValidationError;
+      const path = Array.isArray(loc)
+        ? loc.filter((segment) => segment !== "body").join(".")
+        : "";
+      const message = typeof msg === "string" ? msg : "";
+      if (path && message) return `${path}: ${message}`;
+      return path || message;
+    })
+    .filter(Boolean);
+  return parts.length > 0 ? parts.join("; ") : null;
+}
+
 async function readError(response: Response): Promise<string> {
   try {
-    const payload = (await response.json()) as { detail?: string; message?: string };
-    return payload.detail || payload.message || `Request failed (${response.status})`;
+    const payload = (await response.json()) as {
+      detail?: unknown;
+      message?: string;
+    };
+    const formattedDetail = formatDetail(payload.detail);
+    if (formattedDetail) return formattedDetail;
+    if (typeof payload.message === "string" && payload.message) {
+      return payload.message;
+    }
+    return `Request failed (${response.status})`;
   } catch {
     return `Request failed (${response.status})`;
   }