fix: Resolve flyspell keybinding and mu4e sent folder sync issues

Two Method 1 quick wins shipped:

1. Fixed cj/flyspell-then-abbrev keybinding in org-mode
   - Autoload cookies were comments and never executed
   - Added explicit keybinding setup when module loads
   - Override org-mode's C-' binding (org-cycle-agenda-files)
   - Both C-' and C-c f now work in all buffers

2. Fixed mu4e sent folder not syncing (cmail account)
   - Root cause: mbsync aborted on Drafts errors before Sent
   - Changed ~/.mbsyncrc to explicit channels (like Gmail)
   - Synced 136 missing sent messages (May-Nov 7)
   - Now syncs 6 folders independently

Files modified:
- modules/flyspell-and-abbrev.el: Fixed keybindings (lines 235-251)
- todo.org: Marked 2 tasks complete with documentation

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

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