refactor(dashboard): regroup launcher icons into 4/4/4 by purpose

Telegram had landed alone on a third row of one icon, with the
first two rows holding a mixed bag (Code next to Email next to
Agenda next to Files next to Music; Feeds next to IRC next to
Slack next to Flashcards next to Books next to Terminal).  No
category showed up grouped, and the asymmetry was bugging me
every dashboard open.

Regroup by what the icons actually do.  Three rows of four:

- Row 1 Work:           Code   / Files       / Terminal / Agenda
- Row 2 Read & Learn:   Feeds  / Books       / Flashcards / Music
- Row 3 Communication:  Email  / IRC         / Slack     / Telegram

Reorder the `define-key' calls on `dashboard-mode-map' to mirror
the row layout -- reading the keymap top-to-bottom now matches
reading the icons left-to-right.

Drive-by fix in the same commit: Music had an icon but no
`dashboard-mode-map' keybinding (mouse-only).  Bound to `m'.

1 files changed, 39 insertions, 33 deletions

diff --git a/modules/dashboard-config.el b/modules/dashboard-config.el
index b61129ad..93477b48 100644
--- a/modules/dashboard-config.el
+++ b/modules/dashboard-config.el
@@ -124,25 +124,41 @@ Adjust this if the title doesn't appear centered under the banner image.")
   ;; == navigation
   (setq dashboard-set-navigator t)
   (setq dashboard-navigator-buttons
-        `(;; Row 1
+        `(;; Row 1 — Work tools
           ((,(nerd-icons-faicon "nf-fa-code")
             "Code" "Switch Project"
             (lambda (&rest _) (projectile-switch-project))
             nil " " "")
 
-           (,(nerd-icons-faicon "nf-fa-envelope")
-            "Email" "Mu4e Email Client"
-            (lambda (&rest _) (mu4e))
+           (,(nerd-icons-faicon "nf-fa-folder_o")
+            "Files" "Dirvish File Manager"
+            (lambda (&rest _) (dirvish user-home-dir))
+            nil " " "")
+
+           (,(nerd-icons-devicon "nf-dev-terminal")
+            "Terminal" "Launch VTerm"
+            (lambda (&rest _) (vterm))
             nil " " "")
 
            (,(nerd-icons-mdicon "nf-md-calendar")
             "Agenda" "Main Org Agenda"
             (lambda (&rest _) (cj/main-agenda-display))
+            nil " " ""))
+
+          ;; Row 2 — Read & Learn
+          ((,(nerd-icons-faicon "nf-fa-rss_square")
+            "Feeds" "Elfeed Feed Reader"
+            (lambda (&rest _) (cj/elfeed-open))
             nil " " "")
 
-           (,(nerd-icons-faicon "nf-fa-folder_o")
-            "Files" "Dirvish File Manager"
-            (lambda (&rest _) (dirvish user-home-dir))
+           (,(nerd-icons-faicon "nf-fae-book_open_o")
+            "Books" "Calibre Ebook Reader"
+            (lambda (&rest _) (calibredb))
+            nil " " "")
+
+           (,(nerd-icons-mdicon "nf-md-school")
+            "Flashcards" "Org-Drill"
+            (lambda (&rest _) (cj/drill-start))
             nil " " "")
 
            (,(nerd-icons-mdicon "nf-md-music")
@@ -150,10 +166,10 @@ Adjust this if the title doesn't appear centered under the banner image.")
             (lambda (&rest _) (cj/music-playlist-toggle) (cj/music-playlist-load))
             nil " " ""))
 
-          ;; Row 2
-          ((,(nerd-icons-faicon "nf-fa-rss_square")
-            "Feeds" "Elfeed Feed Reader"
-            (lambda (&rest _) (cj/elfeed-open))
+          ;; Row 3 — Communication
+          ((,(nerd-icons-faicon "nf-fa-envelope")
+            "Email" "Mu4e Email Client"
+            (lambda (&rest _) (mu4e))
             nil " " "")
 
            (,(nerd-icons-faicon "nf-fa-comments")
@@ -166,23 +182,7 @@ Adjust this if the title doesn't appear centered under the banner image.")
             (lambda (&rest _) (cj/slack-start))
             nil " " "")
 
-           (,(nerd-icons-mdicon "nf-md-school")
-            "Flashcards" "Org-Drill"
-            (lambda (&rest _) (cj/drill-start))
-            nil " " "")
-
-           (,(nerd-icons-faicon "nf-fae-book_open_o")
-            "Books" "Calibre Ebook Reader"
-            (lambda (&rest _) (calibredb))
-            nil " " "")
-
-           (,(nerd-icons-devicon "nf-dev-terminal")
-            "Terminal" "Launch VTerm"
-            (lambda (&rest _) (vterm))
-            nil " " ""))
-
-          ;; Row 3
-          ((,(nerd-icons-faicon "nf-fa-telegram")
+           (,(nerd-icons-faicon "nf-fa-telegram")
             "Telegram" "Telega Telegram Client"
             (lambda (&rest _) (cj/telega))
             nil " " ""))))
@@ -197,17 +197,23 @@ Adjust this if the title doesn't appear centered under the banner image.")
   ;; Disable 'q' to quit dashboard
   (define-key dashboard-mode-map (kbd "q") nil)
 
-  ;; Dashboard launcher keybindings
-  (define-key dashboard-mode-map (kbd "e") (lambda () (interactive) (mu4e)))
+  ;; Dashboard launcher keybindings, ordered to mirror the icon rows.
+  ;; Row 1 — Work tools
   (define-key dashboard-mode-map (kbd "c") (lambda () (interactive) (projectile-switch-project)))
+  (define-key dashboard-mode-map (kbd "d") (lambda () (interactive) (dirvish user-home-dir)))
+  (define-key dashboard-mode-map (kbd "t") (lambda () (interactive) (vterm)))
   (define-key dashboard-mode-map (kbd "a") (lambda () (interactive) (cj/main-agenda-display)))
+  ;; Row 2 — Read & Learn
+  (define-key dashboard-mode-map (kbd "r") (lambda () (interactive) (cj/elfeed-open)))
   (define-key dashboard-mode-map (kbd "b") (lambda () (interactive) (calibredb)))
   (define-key dashboard-mode-map (kbd "f") (lambda () (interactive) (cj/drill-start)))
-  (define-key dashboard-mode-map (kbd "r") (lambda () (interactive) (cj/elfeed-open)))
+  (define-key dashboard-mode-map (kbd "m") (lambda () (interactive)
+                                             (cj/music-playlist-toggle)
+                                             (cj/music-playlist-load)))
+  ;; Row 3 — Communication
+  (define-key dashboard-mode-map (kbd "e") (lambda () (interactive) (mu4e)))
   (define-key dashboard-mode-map (kbd "i") (lambda () (interactive) (cj/erc-switch-to-buffer-with-completion)))
   (define-key dashboard-mode-map (kbd "s") (lambda () (interactive) (cj/slack-start)))
-  (define-key dashboard-mode-map (kbd "t") (lambda () (interactive) (vterm)))
-  (define-key dashboard-mode-map (kbd "d") (lambda () (interactive) (dirvish user-home-dir)))
   (define-key dashboard-mode-map (kbd "g") (lambda () (interactive) (cj/telega))))
 
 ;; Override banner title centering (must be after dashboard-widgets loads)