Fix renderFilter form accumulating duplicate filter parameters

[Copilot]

The renderFilter form used action="", causing browsers to append form parameters to the current URL instead of replacing them. Multiple submissions accumulated duplicate filter= parameters, breaking pagination filtering.

Changes:

• Set form action to request path without query string using Wai.rawPathInfo theRequest
• Consolidated duplicate rawPathInfo calls by extracting to shared path variable

Before:

First submit:  /users?filter=john&page=1
Second submit: /users?filter=john&filter=jane&page=1  ❌

After:

First submit:  /users?filter=john&page=1
Second submit: /users?filter=jane&page=1  ✓

The fix ensures form submissions replace query parameters rather than appending to existing ones, restoring v1.3.0 behavior.

Original prompt

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This section details on the original issue you should resolve

<issue_title>renderFilter adds filter= to URL many times</issue_title>
<issue_description>In IHP v1.3.0, this was not a problem. If you used the pagination function renderFilter and submitted the form more than once, it would overwrite the filter parameter in the URL. However, in IHP v.1.4.x it keeps adding multiple filter parameters to the URL over and over. This causes the filtering not to work. Since the renderFilter function hasn't changed, I think it may be related to this: ad872d5 somehow.</issue_description>

<agent_instructions>take a look and see whether you can figure this one out</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes renderFilter adds filter= to URL many times #2156

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