### **User description**
1. This PR fixes the issue in add alert page when user tries to provide
invalid input for threshold it was showing under the input , it should
show below the input
___
### **PR Type**
Bug fix
___
### **Description**
- Fix threshold error message positioning
- Treat empty silence input as invalid
- Standardize undefined/null checks with strict equality
- Remove absolute positioning from threshold error
___
### Diagram Walkthrough
```mermaid
flowchart LR
RT["RealTimeAlert.vue validation"] -- add '' check --> RTERR["Show 'Field is required!'"]
SA1["ScheduledAlert.vue threshold error"] -- remove absolute --> SAERR["Inline error display"]
SA2["ScheduledAlert.vue silence validation"] -- strict null/undef + '' --> SAERR2["Consistent required error"]
```
<details> <summary><h3> File Walkthrough</h3></summary>
<table><thead><tr><th></th><th align="left">Relevant
files</th></tr></thead><tbody><tr><td><strong>Bug
fix</strong></td><td><table>
<tr>
<td>
<details>
<summary><strong>RealTimeAlert.vue</strong><dd><code>Add empty-string
check to silence validation</code>
</dd></summary>
<hr>
web/src/components/alerts/RealTimeAlert.vue
<ul><li>Validate <code>silence</code> also for empty string<br> <li>
Ensure required error shows when input blank</ul>
</details>
</td>
<td><a
href="https://github.com/openobserve/openobserve/pull/7990/files#diff-c3ae6b47832eb33f9ca877cc7165d079de14850e5c5d43a227102ba40326b9d8">+1/-1</a>
</td>
</tr>
<tr>
<td>
<details>
<summary><strong>ScheduledAlert.vue</strong><dd><code>Improve threshold
and silence error handling</code>
</dd></summary>
<hr>
web/src/components/alerts/ScheduledAlert.vue
<ul><li>Remove absolute class from threshold error<br> <li> Add null
check in silence validation<br> <li> Use strict equality for
undefined/null checks<br> <li> Keep empty-string invalid for
silence</ul>
</details>
</td>
<td><a
href="https://github.com/openobserve/openobserve/pull/7990/files#diff-5e143a17ab0fa5d7817f6d9301667fb5597236f27184248c7a71728e85b8d999">+2/-2</a>
</td>
</tr>
</table></td></tr></tr></tbody></table>
</details>
___
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