Improve Slack reconnection instruction clarity
The Slack connection UI is not very intuitive right now:
1. When you click Reconnect, the "DM ..." text does not look like an instruction.
2. Replace DM... with Send a Slack message containing the code ({value}) to Jaah in GMind.
3. Add a spinner with the following label: "Waiting for you to send the Slack message", indicating to the user that their action is required
Perhaps the configuration should be in a dedicated pop-up window that auto-closes once the configuration is done

Outcome
Slack and Telegram connect now open an auto-closing dialog: "In Slack, send CODE to @Jaah in <workspace>." / "Open Telegram and tap Start." plus a waiting spinner, no countdown. Quick gate green, tests 25/25. PR #7120 queued to merge lane. Memory: none applied.
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