feat: configure thunderbird

configuration.nix

@@ -53,6 +53,28 @@
             esc = "capslock";
             leftalt = "leftcontrol";
             leftcontrol = "leftalt";
+            mute           = "mute";           # ← Key 1: mute
+            volumedown     = "playpause";      # ← Key 2: play/pause
+            volumeup       = "volumedown";     # ← Key 3: vol down
+            previoussong   = "volumeup";       # ← Key 4: vol up
+            playpause      = "command(touch /tmp/keyd-f5-test)"; # ← Key 5: lock screen (testing)
+            nextsong       = "noop";           # ← Key 6: disabled
+            brightnessdown = "noop";           # ← Key 7: disabled
+            brightnessup   = "noop";           # ← Key 8: disabled
+            # Key 9: display toggle (leftmeta+p) - disabled below
+            rfkill         = "brightnessdown"; # ← Key 10: brightness down
+            sysrq          = "brightnessup";   # ← Key 11: brightness up
+            media          = "sysrq";          # ← Key 12: screenshot
+          };
+        };
+      };
+      frameworkRadio = {
+        ids = [ "32ac:0006" ];
+        settings = {
+          main = {
+            brightnessdown = "noop";   # ← Key 7: disabled
+            brightnessup   = "noop";   # ← Key 8: disabled
+            rfkill = "brightnessdown"; # ← Key 10: brightness down
           };
         };
       };

home.nix

@@ -104,7 +104,6 @@ in
     prismlauncher
     qbittorrent-enhanced
     signal-desktop
-    thunderbird
     vesktop
     vlc
     zulip
@@ -442,6 +441,97 @@ in
     };
   };
 
+  programs.thunderbird = {
+    enable = true;
+    profiles.default = {
+      isDefault = true;
+      settings = {
+        # Use maildir instead of mbox — faster for large mailboxes
+        "mail.serverDefaultStoreContractID" = "@mozilla.org/msgstore/maildirstore;1";
+
+        # Increase IMAP connection limits
+        "mail.server.default.max_cached_connections" = 10;
+        "mail.imap.max_cached_connections" = 10;
+
+        # IMAP IDLE — server pushes new mail instantly (no polling delay)
+        "mail.server.default.use_idle" = true;
+
+        # Poll every 1 minute as fallback when IDLE drops
+        "mail.server.default.check_new_mail" = true;
+        "mail.server.default.check_time" = 1;
+
+        # Faster IMAP sync
+        "mail.imap.min_time_between_cleanups" = 300;
+        "mail.imap.fetch_by_chunks" = true;
+        "mail.imap.chunk_size" = 65536;
+        "mail.imap.chunk_add" = 16384;
+
+        # Reduce timeouts (fail fast instead of hanging)
+        "mail.server.default.timeout" = 60;
+        "mailnews.tcptimeout" = 60;
+
+        # Network performance
+        "network.http.max-connections" = 48;
+        "network.http.max-persistent-connections-per-server" = 10;
+        "network.dns.disablePrefetch" = false;
+
+        # Cache messages offline for instant reading
+        "mail.server.default.offline_download" = true;
+        "mail.server.default.download_on_biff" = true;
+
+        # Auto-compact folders when >20MB wasted (keeps mbox files lean)
+        "mail.purge_threshhold_mb" = 20;
+        "mail.prompt_purge_threshhold" = false;
+
+        # Block remote content by default (tracking pixels, slow image loads)
+        "mailnews.message_display.disable_remote_image" = true;
+
+        # Disable adaptive junk filter (server-side spam is better)
+        "mail.spam.manualMark" = true;
+        "mailnews.ui.junk.firstuse" = false;
+        "mailnews.ui.junk.manualMarkAsJunkMarksRead" = true;
+
+        # Prefetch next message while reading current one
+        "mail.server.default.autosync_offline_stores" = true;
+
+        # Open links in default browser (Zen) instead of Thunderbird's internal browser
+        "network.protocol-handler.warn-external.http" = false;
+        "network.protocol-handler.warn-external.https" = false;
+        "network.protocol-handler.expose-all" = true;
+
+        # Simplify message rendering
+        "mailnews.display.prefer_plaintext" = false;
+        "mailnews.display.disallow_mime_handlers" = 0;
+        "mailnews.display.html_as" = 0;
+
+        # Disable return receipt prompts
+        "mail.incorporate.return_receipt" = 0;
+        "mail.receipt.request_return_receipt_on" = false;
+
+        # Disable chat and calendar background connections
+        "mail.chat.enabled" = false;
+        "calendar.integration.notify" = false;
+
+        # Disable unnecessary features
+        "mail.phishing.detection.enabled" = false;
+        "mail.rights.version" = 1;
+        "mail.shell.checkDefaultClient" = false;
+        "mail.spotlight.enable" = false;
+
+        # Faster UI rendering
+        "gfx.webrender.all" = true;
+
+        # Network keepalive
+        "network.http.keep-alive.timeout" = 600;
+        "network.http.response.timeout" = 120;
+
+        # Fix UI not updating after delete/archive — move to next message automatically
+        "mail.delete_matches_sort_order" = true;
+        "mail.advance_on_delete" = true;
+      };
+    };
+  };
+
   home.file.".claude/settings.json".text = builtins.toJSON {
     allowedTools = [
       "Read"