🎨 Palette: Add tooltip to disabled bulk action buttons

[mapleleaflatte03]

💡 What
Added a native HTML title="Select items to enable bulk actions" attribute to the four bulk action buttons (approve, stale, revoke, unresolved) in the Trust Ops queue surface (trust-ops.html). Updated the meridian.js frontend script to dynamically remove this title when items are selected (and the buttons are enabled), and restore it when the selection is cleared.

🎯 Why
When operators open the Trust Ops queue, the bulk action buttons are disabled by default. Without an explanation, it might be unclear why they cannot take action. This micro-UX improvement clarifies the required interaction pattern (selecting queue items first) without adding any visual clutter or requiring new CSS rules.

📸 Before/After

• Before: Disabled buttons had no hover explanation.
• After: Hovering over the disabled buttons reveals a native system tooltip explaining "Select items to enable bulk actions".

♿ Accessibility
Improves accessibility and cognitive ease by providing an explicit reason for the disabled state. Screen readers and mouse users alike benefit from understanding the prerequisite action required to enable the controls.

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PR created automatically by Jules for task 18085669579238905860 started by @mapleleaflatte03

[google-labs-jules]

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