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

1 files changed, 8 insertions, 3 deletions

diff --git a/modules/flyspell-and-abbrev.el b/modules/flyspell-and-abbrev.el
index d12a17941..e29ad6e9f 100644
--- a/modules/flyspell-and-abbrev.el
+++ b/modules/flyspell-and-abbrev.el
@@ -234,10 +234,15 @@ Press C-' repeatedly to step through misspellings one at a time."
 
 ;; -------------------------------- Keybindings --------------------------------
 ;; Global keybindings for spell checking commands
-;; With autoload cookies, these will lazy-load the file when pressed
 
-;;;###autoload (keymap-set global-map "C-c f" #'cj/flyspell-toggle)
-;;;###autoload (keymap-set global-map "C-'" #'cj/flyspell-then-abbrev)
+;; Set global keybindings
+(keymap-set global-map "C-c f" #'cj/flyspell-toggle)
+(keymap-set global-map "C-'" #'cj/flyspell-then-abbrev)
+
+;; Override org-mode's C-' binding (org-cycle-agenda-files)
+;; Org-mode binds C-' globally, but we want our spell check binding instead
+(with-eval-after-load 'org
+  (keymap-set org-mode-map "C-'" #'cj/flyspell-then-abbrev))
 
 ;; which-key labels
 (with-eval-after-load 'which-key