feat: Enhance hook management and session handling

- Update hook model to include last_triggered_at field.
- Modify API endpoints to support updating hooks with new fields.
- Implement session management UI improvements with toggle functionality.
- Add new JavaScript functions for better session detail visibility.
- Refactor hook storage logic to handle last triggered timestamps.
- Introduce new favicon and logo for branding.
- Update styles for improved layout and user experience.
- Enhance tests to cover new functionality and ensure reliability.

app/models.py

@@ -1,7 +1,7 @@
 from datetime import datetime
 from typing import Optional
 
-from pydantic import BaseModel, Field
+from pydantic import BaseModel, Field, field_validator, model_validator
 
 
 class HookCreate(BaseModel):
@@ -14,6 +14,7 @@ class HookRead(BaseModel):
     message: str
     chat_id: str
     created_at: datetime
+    last_triggered_at: Optional[datetime] = None
 
     @property
     def action_path(self) -> str:
@@ -24,14 +25,60 @@ class HookResponse(HookRead):
     action_url: str
 
 
-class HookUpdateId(BaseModel):
-    hook_id: str = Field(
-        ...,
+class HookUpdate(BaseModel):
+    hook_id: Optional[str] = Field(
+        default=None,
         min_length=3,
         max_length=64,
         pattern=r"^[A-Za-z0-9_-]+$",
         description="New hook identifier",
     )
+    chat_id: Optional[str] = Field(
+        default=None,
+        min_length=1,
+        description="Updated target chat ID or username",
+    )
+    message: Optional[str] = Field(
+        default=None,
+        min_length=1,
+        description="Updated message body supporting Markdown",
+    )
+
+    @model_validator(mode="after")
+    def ensure_any_field(cls, values: "HookUpdate") -> "HookUpdate":
+        if values.hook_id is None and values.chat_id is None and values.message is None:
+            raise ValueError("Provide at least one field to update")
+        return values
+
+    @field_validator("hook_id", mode="before")
+    @classmethod
+    def normalize_hook_id(cls, value: Optional[str]) -> Optional[str]:
+        if value is None:
+            return None
+        trimmed = value.strip()
+        if not trimmed:
+            raise ValueError("Hook ID cannot be empty")
+        return trimmed
+
+    @field_validator("chat_id", mode="before")
+    @classmethod
+    def normalize_chat_id(cls, value: Optional[str]) -> Optional[str]:
+        if value is None:
+            return None
+        trimmed = value.strip()
+        if not trimmed:
+            raise ValueError("Chat ID cannot be empty")
+        return trimmed
+
+    @field_validator("message", mode="before")
+    @classmethod
+    def normalize_message(cls, value: Optional[str]) -> Optional[str]:
+        if value is None:
+            return None
+        stripped = value.strip()
+        if not stripped:
+            raise ValueError("Message cannot be empty")
+        return stripped
 
 
 class LoginStartRequest(BaseModel):