docs(todo): update task state, tags, and tag alignment

Close the window-placement and tag-alignment work that shipped (Slack, mu4e, dupre tags and the right-align feature), and queue the open follow-ups: the EAT consolidation, the ai-vterm/mu4e/Slack window tickets, and a Signal-client task. Record the researched Signal-client candidates and the Claude-Code-in-eat findings against their tasks, log the decision to remove the disabled popper-config, and fold the "no remote install" constraint into the TRAMP task.

Fix the two invalid org tags (no-sync, which has a hyphen org rejects, so it read as title text) to nosync, and tag the previously untagged GPTel and Signal tasks. Realign every heading's tags to a single space to match org-tags-column 0, which reverts stale column-77 padding that had drifted in.

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