fix(web): add insights selection toggle

[Haz3-jolt]

Purpose / Description

Add a bulk selection control to the agent insights suggestions panel so users do not have to manually clear many preselected suggestions before choosing a smaller set.

Fixes

• No linked issue.

Approach

Added a compact header action for V4 insight suggestions. When every suggestion is selected, it shows Unselect all. Otherwise, it shows Select all. The action updates config additions, features, and usage patterns together, and closes any pending confirmation state.

How Has This Been Tested?

Learning (optional, can help others)

No external research. Reused the existing suggestions selection state in web/src/pages/admin/insights/detail.tsx.

Checklist

Please, go through these checks before submitting the PR.

• You have a descriptive commit message with a short title (first line, max 50 chars).
• You have commented your code, particularly in hard-to-understand areas
• You have performed a self-review of your own code
• UI changes: include screenshots of all affected screens (in particular showing any new or changed strings)

AI Assistance

Was generative AI tooling used to co-author this PR?

• Yes(Please Specify the tool): Pi coding agent
• Was the generated code manually reviewed and tested?