feat(file-viewer): show hidden files and folders

The tree endpoint has accepted `showHidden=true` since it was written; the
panel hardcoded `showHidden=false`, so dot-prefixed entries were unreachable
from the File Viewer and opening one meant guessing its path.

Adds a `.*` toggle to the panel header. It re-fetches instead of re-rendering
the cached tree (the filtering is server-side), preserves the expanded
directories so toggling does not collapse the tree, and persists per-device to
its own `codeman:fileBrowserShowHidden` key. That key is deliberately not part
of the app-settings object, which `saveAppSettings()` rebuilds from the
settings-modal DOM and would drop it on the next save.

Default is OFF, so an untouched install behaves exactly as before.

Closes #221

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

src/web/public/app.js

@@ -615,6 +615,11 @@ class CodemanApp {
     this.fileBrowserFilter = '';
     this.fileBrowserAllExpanded = false;
     this.fileBrowserDragListeners = null;
+    // Show hidden (dot-prefixed) files and folders in the File Viewer tree.
+    // Per-device, persisted to its own localStorage key by panels-ui.js. Safe to
+    // call a mixin method here: instantiation is deferred to DOMContentLoaded,
+    // so every module's Object.assign has already run.
+    this.fileBrowserShowHidden = this._loadFileBrowserShowHidden?.() ?? false;
     this.filePreviewContent = '';
 
     // Toast container cache (methods in panels-ui.js)

src/web/public/index.html

@@ -407,6 +407,7 @@
       <div class="file-browser-header">
         <span class="file-browser-title">Files</span>
         <div class="file-browser-actions">
+          <button class="btn-icon-sm btn-file-browser-hidden" onclick="app.toggleFileBrowserHidden()" title="Show hidden files and folders" aria-label="Show hidden files and folders" aria-pressed="false" id="fileBrowserHiddenBtn">.*</button>
           <button class="btn-icon-sm" onclick="app.refreshFileBrowser()" title="Refresh">&#x21BB;</button>
           <button class="btn-icon-sm" onclick="app.toggleFileBrowserExpand()" title="Expand/Collapse All" id="fileBrowserExpandBtn">&#x229E;</button>
           <button class="btn-icon-sm" onclick="app.closeFileBrowserPanel()" title="Close">&times;</button>

src/web/public/panels-ui.js

@@ -14,6 +14,7 @@
  */
 
 const AWAY_DIGEST_LAST_VIEWED_KEY = 'codeman-away-digest-last-viewed';
+const FILE_BROWSER_SHOW_HIDDEN_KEY = 'codeman:fileBrowserShowHidden';
 const AWAY_DIGEST_SECTIONS = [
   ['needsAttention', 'Needs Attention'],
   ['completed', 'Completed'],
@@ -2944,18 +2945,56 @@ Object.assign(CodemanApp.prototype, {
   // File Browser Panel
   // ═══════════════════════════════════════════════════════════════
 
+  // Hidden files/folders (dot-prefixed) are filtered SERVER-side by
+  // GET /api/sessions/:id/files, so the toggle re-fetches rather than
+  // re-rendering the cached tree (issue #221). The flag is per-device and lives
+  // in its own localStorage key instead of the app-settings object: that object
+  // is rebuilt from the settings-modal DOM on every save, so a key toggled from
+  // outside the modal would be dropped the next time settings are saved.
+  _loadFileBrowserShowHidden() {
+    try {
+      return localStorage.getItem(FILE_BROWSER_SHOW_HIDDEN_KEY) === '1';
+    } catch {
+      return false;
+    }
+  },
+
+  _syncFileBrowserHiddenBtn() {
+    const btn = this.$('fileBrowserHiddenBtn');
+    if (!btn) return;
+    const on = this.fileBrowserShowHidden === true;
+    btn.classList.toggle('active', on);
+    btn.setAttribute('aria-pressed', String(on));
+    const label = on ? 'Hide hidden files and folders' : 'Show hidden files and folders';
+    btn.setAttribute('title', label);
+    btn.setAttribute('aria-label', label);
+  },
+
+  async toggleFileBrowserHidden() {
+    this.fileBrowserShowHidden = !this.fileBrowserShowHidden;
+    try {
+      localStorage.setItem(FILE_BROWSER_SHOW_HIDDEN_KEY, this.fileBrowserShowHidden ? '1' : '0');
+    } catch {}
+    this._syncFileBrowserHiddenBtn();
+    // Expanded-directory state is deliberately preserved so toggling does not
+    // collapse the tree the user just navigated.
+    if (this.activeSessionId) await this.loadFileBrowser(this.activeSessionId);
+  },
+
   async loadFileBrowser(sessionId) {
     if (!sessionId) return;
 
     const treeEl = this.$('fileBrowserTree');
     const statusEl = this.$('fileBrowserStatus');
+    this._syncFileBrowserHiddenBtn();
     if (!treeEl) return;
 
     // Show loading state
     treeEl.innerHTML = '<div class="file-browser-loading">Loading files...</div>';
 
     try {
-      const res = await fetch(`/api/sessions/${sessionId}/files?depth=5&showHidden=false`);
+      const showHidden = this.fileBrowserShowHidden === true;
+      const res = await fetch(`/api/sessions/${sessionId}/files?depth=5&showHidden=${showHidden}`);
       if (!res.ok) throw new Error('Failed to load files');
 
       const result = await res.json();
@@ -2967,7 +3006,7 @@ Object.assign(CodemanApp.prototype, {
       // Update status
       if (statusEl) {
         const { totalFiles, totalDirectories, truncated } = result.data;
-        statusEl.textContent = `${totalFiles} files, ${totalDirectories} dirs${truncated ? ' (truncated)' : ''}`;
+        statusEl.textContent = `${totalFiles} files, ${totalDirectories} dirs${truncated ? ' (truncated)' : ''}${showHidden ? ' · hidden shown' : ''}`;
       }
     } catch (err) {
       console.error('Failed to load file browser:', err);

src/web/public/styles.css

@@ -9192,6 +9192,20 @@ kbd {
   gap: 0.25rem;
 }
 
+/* Show-hidden toggle: a literal `.*` glyph rather than an icon, so its meaning
+ * (dot-prefixed files and folders) survives every skin and font stack. */
+.btn-file-browser-hidden {
+  font-family: var(--font-mono, monospace);
+  font-size: 0.85rem;
+  font-weight: 700;
+  letter-spacing: -0.05em;
+}
+
+.btn-file-browser-hidden.active {
+  color: var(--accent);
+  background: var(--bg-hover);
+}
+
 .file-browser-search {
   padding: 0.4rem;
   border-bottom: 1px solid var(--border);