PAB-48: avoid unused frontmost-app polling

[pablopunk]

This PR makes the frontmost-app polling conditional, so it only runs when at least one enabled extension subscribes to the app.frontmost.changed event. Previously, the polling job was always active, consuming system resources even when no extension needed the data. Now, the polling automatically starts when an extension subscriber is present and stops when none remain—such as after extensions are reloaded or updated. This change reduces unnecessary background work and improves resource efficiency.

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Project	Deployment	Actions	Updated (UTC)
nvm	Ready	Preview, Comment	Jul 17, 2026 12:28pm

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