feat: add mobile new issue navigation (Closes #971)

frontend/dashboard.css

@@ -701,7 +701,9 @@ textarea { resize: vertical; min-height: 120px; }
 .create-issue-panel { width:min(560px,100%); height:100dvh; overflow:auto; overflow-x:hidden; display:grid; align-content:start; gap:12px; padding:18px; padding-bottom:calc(18px + env(safe-area-inset-bottom)); background:#0b1526; border-left:1px solid #2a496e; }
 .create-issue-header { display:flex; align-items:center; justify-content:space-between; gap:10px; }
 .create-issue-header button, .create-issue-actions button, .create-issue-capture-actions button { min-height:44px; }
+.mobile-create-issue-nav { display:none; }
 .create-issue-form { display:grid; gap:12px; }
+.create-issue-describe { display:grid; gap:12px; min-width:0; }
 .voice-issue-capture { display:grid; gap:8px; min-width:0; padding:12px; border:1px solid #31577f; border-radius:12px; background:#101d31; }
 .voice-issue-capture[hidden], .voice-issue-review[hidden], .voice-issue-controls button[hidden] { display:none; }
 .voice-issue-heading, .voice-issue-review { display:grid; gap:6px; }
@@ -908,6 +910,20 @@ textarea { resize: vertical; min-height: 120px; }
   .saved-search-row { align-items:stretch; }
   #cmd-results { flex:1; min-height:0; overflow-y:auto; max-height:none; overscroll-behavior:contain; padding-bottom:env(safe-area-inset-bottom); }
   .create-issue-panel { width:100%; border-left:0; padding:14px; }
+  .mobile-create-issue-nav {
+    position:sticky; top:env(safe-area-inset-top); z-index:6;
+    display:grid; grid-template-columns:repeat(3,minmax(0,1fr)); gap:4px;
+    margin-inline:-14px; padding:4px 14px;
+    background:rgba(11,21,38,.98); border-block:1px solid #2a496e;
+  }
+  .mobile-create-issue-nav button {
+    min-width:0; min-height:44px; padding:4px; border-color:transparent; font-size:12px;
+  }
+  .mobile-create-issue-nav button[aria-current="location"] {
+    border-color:#60a5fa; background:#17365a; color:#fff;
+  }
+  .mobile-create-issue-nav button[aria-disabled="true"] { opacity:.55; }
+  #create-issue-describe, #create-issue-evidence, #create-issue-filing { scroll-margin-top:72px; }
   .pull-sheet-panel { width:100%; border-left:0; padding:14px; }
   .create-issue-panel.composer-keyboard-active,
   .issue-sheet-panel.composer-keyboard-active,

frontend/index.html

@@ -873,6 +873,11 @@
       <h3 id="create-issue-heading">Capture work</h3>
       <button id="cancel-new-issue" type="button">Cancel</button>
     </div>
+    <nav class="mobile-create-issue-nav" aria-label="New issue sections">
+      <button type="button" data-create-issue-section="describe">Describe</button>
+      <button type="button" data-create-issue-section="evidence">Evidence</button>
+      <button type="button" data-create-issue-section="file">File</button>
+    </nav>
     <aside class="shared-content-conflict" id="shared-content-conflict" aria-live="assertive" hidden>
       <strong>You already have an unfinished issue draft.</strong>
       <span class="small">Resume it, or replace its title and description with the content shared to Stackchain.</span>
@@ -882,6 +887,7 @@
       </div>
     </aside>
     <form class="create-issue-form" id="create-issue-form">
+      <section class="create-issue-describe" id="create-issue-describe">
       <label for="create-issue-title">Title
         <input id="create-issue-title" type="text" maxlength="255" required autocomplete="off" />
       </label>
@@ -913,7 +919,8 @@
         <button id="save-unfiled-issue" type="button">Save to Drafts</button>
         <button id="file-new-issue" type="button">File now</button>
       </div>
-      <section class="create-issue-attachment" aria-labelledby="create-issue-attachment-label">
+      </section>
+      <section class="create-issue-attachment" id="create-issue-evidence" aria-labelledby="create-issue-attachment-label">
         <strong id="create-issue-attachment-label">Photo evidence <span class="small">Optional · Up to 5 · PNG, JPEG, or WebP · 2 MB each</span></strong>
         <div class="issue-attachment-controls photo-evidence-actions">
           <label class="issue-attachment-trigger" for="take-create-issue-photo">Take photo</label>
@@ -1537,6 +1544,7 @@
 <script src="static/voice-issue-capture.js"></script>
 <script src="static/voice-conversation-capture.js"></script>
 <script src="static/create-issue-sheet.js"></script>
+<script src="static/mobile-create-issue-nav.js"></script>
 <script src="static/create-and-start.js"></script>
 <script src="static/assign-and-start.js"></script>
 <script src="static/filed-claim.js"></script>

frontend/mobile-create-issue-nav.js

@@ -0,0 +1,115 @@
+function createMobileCreateIssueNavigation(options) {
+  const buttons = options.buttons || {};
+  const targets = options.targets || {};
+  const listeners = new Map();
+  const prefersReducedMotion = options.prefersReducedMotion || (() => false);
+  const targetNames = new Map(Object.entries(targets).map(([name, target]) => [target, name]));
+  let filingAvailable = !options.filing?.hidden;
+  let observer = null;
+
+  function select(name) {
+    Object.entries(buttons).forEach(([key, button]) => {
+      if (!button) return;
+      if (key === name) button.setAttribute('aria-current', 'location');
+      else button.removeAttribute('aria-current');
+    });
+  }
+
+  function setFilingAvailable(available) {
+    filingAvailable = Boolean(available);
+    const button = buttons.file;
+    if (!button) return;
+    if (filingAvailable) button.removeAttribute('aria-disabled');
+    else button.setAttribute('aria-disabled', 'true');
+  }
+
+  function navigate(name) {
+    if (name === 'file') setFilingAvailable(!options.filing?.hidden);
+    if (name === 'file' && !filingAvailable) return false;
+    const target = targets[name];
+    if (!target) return false;
+    target.scrollIntoView({
+      block: 'start',
+      behavior: prefersReducedMotion() ? 'auto' : 'smooth',
+    });
+    select(name);
+    return true;
+  }
+
+  function reset(available = !options.filing?.hidden) {
+    setFilingAvailable(available);
+    select('describe');
+  }
+
+  return {
+    start() {
+      Object.entries(buttons).forEach(([name, button]) => {
+        if (!button || listeners.has(button)) return;
+        const listener = event => {
+          event.preventDefault();
+          navigate(name);
+        };
+        listeners.set(button, listener);
+        button.addEventListener('click', listener);
+      });
+      reset();
+      const observe = options.observe || ((handler, observedTargets, root) => {
+        if (typeof IntersectionObserver === 'undefined') return null;
+        const instance = new IntersectionObserver(handler, {
+          root,
+          rootMargin: '-20% 0px -60% 0px',
+          threshold: [0, 0.25, 0.5, 0.75, 1],
+        });
+        observedTargets.forEach(target => instance.observe(target));
+        return instance;
+      });
+      observer = observe(entries => {
+        const visible = entries
+          .filter(entry => entry.isIntersecting && targetNames.has(entry.target))
+          .filter(entry => targetNames.get(entry.target) !== 'file' || filingAvailable)
+          .sort((left, right) => right.intersectionRatio - left.intersectionRatio)[0];
+        if (visible) select(targetNames.get(visible.target));
+      }, Array.from(targetNames.keys()).filter(Boolean), options.root || null);
+    },
+    stop() {
+      listeners.forEach((listener, button) => button.removeEventListener('click', listener));
+      listeners.clear();
+      if (observer) observer.disconnect();
+      observer = null;
+    },
+    navigate,
+    reset,
+    select,
+    setFilingAvailable,
+  };
+}
+
+function attachMobileCreateIssueNavigation({ document, window }) {
+  const bySection = name => document.querySelector('[data-create-issue-section="' + name + '"]');
+  const navigation = createMobileCreateIssueNavigation({
+    root:document.querySelector('.create-issue-panel'),
+    buttons:{describe:bySection('describe'), evidence:bySection('evidence'), file:bySection('file')},
+    targets:{
+      describe:document.getElementById('create-issue-describe'),
+      evidence:document.getElementById('create-issue-evidence'),
+      file:document.getElementById('create-issue-filing'),
+    },
+    filing:document.getElementById('create-issue-filing'),
+    prefersReducedMotion:() => window.matchMedia('(prefers-reduced-motion: reduce)').matches,
+  });
+  navigation.start();
+  document.getElementById('file-new-issue').addEventListener('click', () => {
+    navigation.navigate('file');
+  });
+  new MutationObserver(() => {
+    if (document.getElementById('create-issue-sheet').classList.contains('open')) {
+      navigation.reset(!document.getElementById('create-issue-filing').hidden);
+    }
+  }).observe(document.getElementById('create-issue-sheet'), {
+    attributes:true, attributeFilter:['class'],
+  });
+  return navigation;
+}
+
+if (typeof module !== 'undefined') module.exports = createMobileCreateIssueNavigation;
+else attachMobileCreateIssueNavigation({document, window});

frontend/service-worker.js

@@ -85,6 +85,7 @@ const SHELL = [
   BASE + 'static/voice-issue-capture.js',
   BASE + 'static/voice-conversation-capture.js',
   BASE + 'static/create-issue-sheet.js',
+  BASE + 'static/mobile-create-issue-nav.js',
   BASE + 'static/create-and-start.js',
   BASE + 'static/assign-and-start.js',
   BASE + 'static/filed-claim.js',