ida: show addresses for file level features in rulegen

[vee1e]

This PR fixes address handling for file-scope features in the IDA rule generator tree.

Closes #1523

• FileOffsetAddress values now render as file:0x... in the rule generator Address column.
• VA-range filtering now treats file:... values as non-VA and avoids parse errors.

Visuals (highlighted in yellow box)

Using al-khaser_x86.exe

Checklist

• No CHANGELOG update needed
• No new tests needed
• No documentation update needed
• This submission includes AI-generated code and I have provided details in the description.

AI usage disclosure

OpenCode with openai/gpt-5.3-codex to help draft and apply code updates.

@devs6186's code in #2904 was also used as a reference.

[gemini-code-assist]

Code Review

This pull request enhances the capa IDA Pro plugin by introducing support for file-scope feature addresses, allowing them to be displayed as file:0x... in the rule generator tree. The changes include logic to resolve these file offsets to virtual addresses for navigation and updates to the filtering mechanism to handle the new address format safely. A review comment suggests a minor optimization in the address formatting logic to remove a redundant integer conversion.