feat: add inline time edit and log editing modal

- Add inline time editing in log list (click on time to edit)
- Add edit button with pencil icon for each log entry
- Modify AddLogModal to support both create and edit modes
- Wire up updateLog from useLogs hook in Dashboard

Co-Authored-By: Claude <noreply@anthropic.com>

frontend/src/components/AddLogModal.tsx

@@ -1,19 +1,43 @@
-import { useState } from 'react';
-import { format } from 'date-fns';
+import { useState, useEffect } from 'react';
+import { format, parseISO } from 'date-fns';
+import type { TimeLog } from '../hooks/useLogs';
 
 interface Props {
   isOpen: boolean;
   onClose: () => void;
   onSave: (data: { date: string; time: string; description: string }) => Promise<unknown>;
+  editingLog?: TimeLog | null;
 }
 
-export function AddLogModal({ isOpen, onClose, onSave }: Props) {
+function formatTimeForInput(hours: number, mins: number): string {
+  if (mins === 0) {
+    return String(hours);
+  }
+  return `${hours}:${String(mins).padStart(2, '0')}`;
+}
+
+export function AddLogModal({ isOpen, onClose, onSave, editingLog }: Props) {
   const [date, setDate] = useState(format(new Date(), 'yyyy-MM-dd'));
   const [time, setTime] = useState('8');
   const [description, setDescription] = useState('');
   const [error, setError] = useState('');
   const [isLoading, setIsLoading] = useState(false);
 
+  useEffect(() => {
+    if (isOpen) {
+      if (editingLog) {
+        setDate(format(parseISO(editingLog.date), 'yyyy-MM-dd'));
+        setTime(formatTimeForInput(editingLog.hours, editingLog.mins));
+        setDescription(editingLog.description);
+      } else {
+        setDate(format(new Date(), 'yyyy-MM-dd'));
+        setTime('8');
+        setDescription('');
+      }
+      setError('');
+    }
+  }, [isOpen, editingLog]);
+
   if (!isOpen) return null;
 
   const handleSubmit = async (e: React.FormEvent) => {
@@ -23,8 +47,6 @@ export function AddLogModal({ isOpen, onClose, onSave }: Props) {
 
     try {
       await onSave({ date, time, description });
-      setTime('8');
-      setDescription('');
       onClose();
     } catch (err) {
       setError(err instanceof Error ? err.message : 'Ошибка');
@@ -40,7 +62,9 @@ export function AddLogModal({ isOpen, onClose, onSave }: Props) {
   return (
     <div className="fixed inset-0 bg-black bg-opacity-50 flex items-center justify-center z-50">
       <div className="bg-white rounded-lg p-6 w-full max-w-md mx-4">
-        <h2 className="text-xl font-semibold mb-4">Новая запись</h2>
+        <h2 className="text-xl font-semibold mb-4">
+          {editingLog ? 'Редактирование записи' : 'Новая запись'}
+        </h2>
 
         <form onSubmit={handleSubmit} className="space-y-4">
           <div>