fix(subscriptions): recover from stuck feed updates

[guthubrx]

Problem

• After a subscription feed fetch hangs (plugin/network), IsGlobalUpdating stays true forever
• Later reload/update requests log Already updating subscriptions or not required and return without starting a new fetch
• The UI keeps showing the cached feed until the app is restarted

Root cause

• UpdateSubscriptionFeed early-returns while IsGlobalUpdating is set, and a hung getSubscriptionsFeedWithExceptions never reaches the finally that clears the flag

Fix

• Track update start time and a generation id on ChannelFeed
• If an update is still marked in-progress after 3 minutes, allow a forced refresh (or a first-load with no feed) to restart
• Ignore stale results from the abandoned update so they cannot overwrite a newer feed

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