Please address the comments from this code review:
## Overall Comments
- Refactor the repeated _showTimePicker/_showClockPicker resets into a single helper method to reduce duplication and ensure consistent state resets when switching views.
- Update the sample DateTimePickers.razor to demonstrate the new PickTimeMode parameter (both dropdown and clock modes) so users can see how to apply it.
- In DateTimeRange, consider using AddTicks(-1) instead of AddMilliseconds(-1) for end-of-day calculations to capture the very last moment of the day more precisely.

## Individual Comments

### Comment 1
<location> `src/BootstrapBlazor/Components/DateTimePicker/DatePickerBody.razor.cs:737` </location>
<code_context>
+        StateHasChanged();
+    }
+
+    private bool HasSeconds()
+    {
+        if (TimeFormat != null)
</code_context>

<issue_to_address>
TimeFormat.Contains('s') may not reliably detect seconds in all format strings.

Consider parsing the format string for valid time specifiers instead of relying on Contains('s'), which may not accurately detect seconds in all cases.
</issue_to_address>

<suggested_fix>
<<<<<<< SEARCH
    private bool HasSeconds()
    {
        if (TimeFormat != null)
        {
            return TimeFormat.Contains('s');
        }

        return TimePickerOption.ShowSecond;
    }
=======
    private bool HasSeconds()
    {
        if (!string.IsNullOrEmpty(TimeFormat))
        {
            return ContainsSecondSpecifier(TimeFormat);
        }

        return TimePickerOption.ShowSecond;
    }

    /// <summary>
    /// Checks if the time format string contains a valid seconds specifier.
    /// </summary>
    /// <param name="format">The time format string.</param>
    /// <returns>True if seconds specifier is present; otherwise, false.</returns>
    private static bool ContainsSecondSpecifier(string format)
    {
        // Check for common .NET and custom format specifiers for seconds
        // "ss" (two-digit seconds), "s" (single-digit seconds), "S" (fractional seconds)
        // You can adjust this logic based on your supported formats
        return format.Contains("ss") || format.Contains("s") || format.Contains("S");
    }
>>>>>>> REPLACE

</suggested_fix>

### Comment 2
<location> `src/BootstrapBlazor/Components/DateTimePicker/DatePickerBody.razor:168` </location>
<code_context>
             </div>
         </div>
     </div>
+    @if (IsDateTimeMode && PickTimeMode == DateTimePickerTimeMode.PickTimeByDropdown)
+    {
+        <div class="@TimePickerClassString">
</code_context>

<issue_to_address>
Consider accessibility and keyboard navigation for the new dropdown time picker.

Check if keyboard users and screen readers can interact with the time picker. Add ARIA attributes or keyboard event handlers as needed.

Suggested implementation:

```
            <input type="text"
                   autocomplete="off"
                   readonly
                   class="form-control"
                   value="@CurrentTime.ToString(TimeFormat)"
                   aria-haspopup="listbox"
                   aria-expanded="@IsTimePickerOpen"
                   aria-label="Select time"
                   tabindex="0"
                   @onclick="@OnShowTimePicker"
                   @onkeydown="@HandleTimePickerKeyDown" />

```

```
            <TimePicker Value="CurrentTime" HasSeconds="HasSeconds()"
                        ShowRequired="false" ShowLabel="false" SkipValidate="true"
                        OnClose="OnCloseTime" OnConfirm="OnConfirmTime"
                        role="listbox"
                        aria-label="Time options"></TimePicker>

```

You will need to implement the following in the code-behind or @code section of this Razor file:
1. Add a property `bool IsTimePickerOpen` to track if the dropdown is open (for `aria-expanded`).
2. Implement the method `HandleTimePickerKeyDown(KeyboardEventArgs e)` to handle Enter/Space keys to open the time picker.
3. Ensure that focus management and closing the dropdown with Escape are handled for full keyboard accessibility.
</issue_to_address>