Timers: admin "Timer font" option with a monospace choice

A new Display-group select (Default / Monospace) sets the font for the
timer and LTC digits. Monospace keeps the numbers from shifting sideways
as they change — easier to read on a fast-moving countdown or timecode.
Flows through server state → client applies a `tm-mono` class and re-fits
the digit sizing; both timer and LTC values (.tm-time) honor it.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

README.md

@@ -176,9 +176,10 @@ below. Nothing is installed without someone clicking.
   discovered timer (and the LTC card) as its own tile, or add "All timers"
   and pick a selection via the tile's "Timers ▾" menu; overruns are
   unmistakably red. Read-only — no start/stop controls. Admin config is in
-  two groups: **ProPresenter** (endpoint host : port, API password) and
+  three groups: **ProPresenter** (endpoint host : port, API password),
   **LTC Timecode** (the listener switch, and — when it's on — the audio
-  device and channel).
+  device and channel), and **Display** (Timer font — Default or Monospace,
+  which keeps the digits from shifting as the numbers change).
 
   ProPresenter exposes no timecode over any API, so LTC is decoded from the
   audio signal, behind the admin **LTC listener** switch (off ⇒ no LTC tile

modules/propresenter-timers/client.js

@@ -393,6 +393,14 @@ export default function create({ root, moduleApi }) {
     rebuildMenu();
     updateLtcAnchor();
 
+    // Admin-chosen digit font. A font swap changes glyph metrics, so re-fit
+    // the digit sizing when it actually changes.
+    const mono = state?.timerFont === 'monospace';
+    if (mono !== wrap.classList.contains('tm-mono')) {
+      wrap.classList.toggle('tm-mono', mono);
+      fit();
+    }
+
     let hint = '';
     if (state && !state.enabled && !state.ltc?.supported) {
       hint = 'No ProPresenter connection — set the host and port in Admin.';

modules/propresenter-timers/module.json

@@ -42,6 +42,16 @@
       "group": "LTC Timecode",
       "showWhen": "ltcEnabled",
       "default": 1
+    },
+    "timerFont": {
+      "type": "select",
+      "label": "Timer font",
+      "group": "Display",
+      "default": "default",
+      "options": [
+        { "value": "default", "label": "Default (system)" },
+        { "value": "monospace", "label": "Monospace — steadier changing digits" }
+      ]
     }
   }
 }

modules/propresenter-timers/server.js

@@ -57,10 +57,11 @@ const { createLtcListener } = require('./ltc-listener');
 /** Set by init(), read by the routes — both are rebuilt together on remount. */
 let current = null;
 
-function clearedState(enabled, ltcEnabled = false) {
+function clearedState(enabled, ltcEnabled = false, timerFont = 'default') {
   return {
     enabled,
     ltcEnabled,
+    timerFont,
     reachable: false,
     lastError: '',
     timers: [],
@@ -86,8 +87,9 @@ module.exports = {
     const ltcEnabled = Boolean(config.ltcEnabled);
     const ltcDevice = String(config.ltcDevice || '');
     const ltcChannel = Math.max(1, Math.trunc(Number(config.ltcChannel)) || 1);
+    const timerFont = config.timerFont === 'monospace' ? 'monospace' : 'default';
 
-    let latest = clearedState(enabled, ltcEnabled);
+    let latest = clearedState(enabled, ltcEnabled, timerFont);
     let lastFrame = '';
     let stopped = false;
     let pollTimer = null;
@@ -207,6 +209,7 @@ module.exports = {
       latest = {
         enabled,
         ltcEnabled,
+        timerFont,
         reachable: latest.reachable,
         lastError: latest.lastError,
         timers: latest.timers,

modules/propresenter-timers/style.css

@@ -113,6 +113,13 @@
   white-space: nowrap;
 }
 
+/* Admin "Timer font: Monospace" — steadier digits as the numbers change.
+   Applies to timer and LTC values alike (both are .tm-time). */
+[data-module="propresenter-timers"] .tm-mono .tm-time {
+  font-family: ui-monospace, "SF Mono", "Menlo", "Cascadia Mono", "Consolas", monospace;
+  letter-spacing: 0;
+}
+
 [data-module="propresenter-timers"] .tm-state {
   flex: none;
   max-width: 100%;