🎨 Palette: Add explanatory tooltips to disabled bulk action buttons

[mapleleaflatte03]

💡 What: Added native title attribute tooltips to the disabled "approve", "stale", "revoke", and "unresolved" bulk action buttons in the Trust Ops dashboard (trust-ops.html). The tooltips are dynamically removed by meridian.js when items are selected and the buttons are enabled.

🎯 Why: To improve the user experience by explaining why the buttons are disabled. Previously, they appeared as non-interactive without any context, which can be frustrating. By using the native HTML title attribute, we provide this context gracefully without needing custom CSS changes, keeping the footprint under 50 lines.

📸 Before/After: Verified via headless Playwright snapshot trust-ops-tooltips.png validating the title attribute presence. (Hover states are native browser behavior triggered by the title attribute).

♿ Accessibility: Improves accessibility for mouse and keyboard users who hover or focus on the element, providing a textual explanation of the disabled state and what action is required ("Select at least one item to apply decision") to enable the interaction.

---

PR created automatically by Jules for task 5025045887756511976 started by @mapleleaflatte03

[google-labs-jules]

👋 Jules, reporting for duty! I'm here to lend a hand with this pull request.

When you start a review, I'll add a 👀 emoji to each comment to let you know I've read it. I'll focus on feedback directed at me and will do my best to stay out of conversations between you and other bots or reviewers to keep the noise down.

I'll push a commit with your requested changes shortly after. Please note there might be a delay between these steps, but rest assured I'm on the job!

For more direct control, you can switch me to Reactive Mode. When this mode is on, I will only act on comments where you specifically mention me with @jules. You can find this option in the Pull Request section of your global Jules UI settings. You can always switch back!

New to Jules? Learn more at jules.google/docs.

---

For security, I will only act on instructions from the user who triggered this task.