feat: mobile logo, expandable history, fix session resume

- Show Codeman logo on mobile as compact home button (was hidden)
- Add "Show More" button for history sessions (initial 4, expand all)
- Deduplicate by projectKey instead of workingDir (lossy decode fix)
- Fix project key decoding: handle '_' encoded as '-' with look-ahead
- Pre-validate resumeSessionId before passing to Claude CLI
- Apply content validation to all session files regardless of size

src/web/public/mobile.css

@@ -301,9 +301,15 @@ html.mobile-init .file-browser-panel {
    Phone Breakpoint (<430px)
    ============================================================================ */
 @media (max-width: 430px) {
-  /* Hide header brand on phones */
+  /* Compact header brand on phones — acts as home button */
   .header-brand {
-    display: none;
+    padding-right: 0.25rem;
+    margin-right: 0.2rem;
+    border-right: none;
+  }
+
+  .header-brand .logo {
+    font-size: 0.7rem;
   }
 
   /* Font controls - compact on phones, visibility controlled by JS */

src/web/public/styles.css

@@ -2224,6 +2224,24 @@ body {
   text-align: right;
 }
 
+.history-show-more {
+  width: 100%;
+  padding: 0.5rem;
+  margin-top: 0.25rem;
+  background: rgba(255, 255, 255, 0.04);
+  border: 1px dashed rgba(255, 255, 255, 0.1);
+  border-radius: 8px;
+  color: var(--text-muted);
+  font-size: 0.75rem;
+  cursor: pointer;
+  transition: background var(--transition-smooth), color var(--transition-smooth);
+}
+
+.history-show-more:hover {
+  background: rgba(255, 255, 255, 0.08);
+  color: var(--text);
+}
+
 .welcome-hint {
   color: var(--text-muted);
   font-size: 0.8rem;
@@ -5485,7 +5503,12 @@ kbd {
 /* Responsive */
 @media (max-width: 600px) {
   .header-brand {
-    display: none;
+    padding-right: 0.4rem;
+    margin-right: 0.3rem;
+  }
+
+  .header-brand .logo {
+    font-size: 0.75rem;
   }
 
   .connection-text {

src/web/public/terminal-ui.js

@@ -734,84 +734,110 @@ Object.assign(CodemanApp.prototype, {
   },
 
   /**
-   * Fetch and deduplicate history sessions (up to 2 per dir, max `limit` total).
-   * @returns {Promise<Array>} deduplicated session list, sorted by lastModified desc
+   * Fetch and deduplicate history sessions (up to 3 per project, sorted by date).
+   * Uses projectKey for grouping because workingDir decoding is lossy.
+   * @returns {Promise<Array>} deduplicated session list, most recent first
    */
-  async _fetchHistorySessions(limit = 12) {
+  async _fetchHistorySessions() {
     const res = await fetch('/api/history/sessions');
     const data = await res.json();
     const sessions = data.sessions || [];
     if (sessions.length === 0) return [];
 
-    const byDir = new Map();
+    const byProject = new Map();
     for (const s of sessions) {
-      if (!byDir.has(s.workingDir)) byDir.set(s.workingDir, []);
-      byDir.get(s.workingDir).push(s);
+      const key = s.projectKey || s.workingDir;
+      if (!byProject.has(key)) byProject.set(key, []);
+      byProject.get(key).push(s);
     }
     const items = [];
-    for (const [, group] of byDir) {
-      items.push(...group.slice(0, 2));
+    for (const [, group] of byProject) {
+      items.push(...group.slice(0, 3));
     }
     items.sort((a, b) => new Date(b.lastModified) - new Date(a.lastModified));
-    return items.slice(0, limit);
+    return items;
   },
 
+  /** Build a single history item DOM element */
+  _buildHistoryItem(s) {
+    const size =
+      s.sizeBytes < 1024
+        ? `${s.sizeBytes}B`
+        : s.sizeBytes < 1048576
+          ? `${(s.sizeBytes / 1024).toFixed(0)}K`
+          : `${(s.sizeBytes / 1048576).toFixed(1)}M`;
+    const date = new Date(s.lastModified);
+    const timeStr =
+      date.toLocaleDateString('en', { month: 'short', day: 'numeric' }) +
+      ' ' +
+      date.toLocaleTimeString('en', { hour: '2-digit', minute: '2-digit', hour12: false });
+    const shortDir = s.workingDir.replace(/^\/home\/[^/]+\//, '~/');
+
+    const item = document.createElement('div');
+    item.className = 'history-item';
+    item.title = s.workingDir;
+    item.addEventListener('click', () => this.resumeHistorySession(s.sessionId, s.workingDir));
+
+    const textCol = document.createElement('div');
+    textCol.className = 'history-item-text';
+
+    const titleSpan = document.createElement('span');
+    titleSpan.className = 'history-item-title';
+    titleSpan.textContent = s.firstPrompt || shortDir;
+
+    const subtitleSpan = document.createElement('span');
+    subtitleSpan.className = 'history-item-subtitle';
+    subtitleSpan.textContent = shortDir;
+
+    textCol.append(titleSpan, subtitleSpan);
+
+    const metaSpan = document.createElement('span');
+    metaSpan.className = 'history-item-meta';
+    metaSpan.textContent = timeStr;
+
+    const sizeSpan = document.createElement('span');
+    sizeSpan.className = 'history-item-size';
+    sizeSpan.textContent = size;
+
+    item.append(textCol, metaSpan, sizeSpan);
+    return item;
+  },
+
+  /** Number of history items shown before "Show More" */
+  _HISTORY_INITIAL_COUNT: 4,
+
   async loadHistorySessions() {
     const container = document.getElementById('historySessions');
     const list = document.getElementById('historyList');
     if (!container || !list) return;
 
     try {
-      const display = await this._fetchHistorySessions(12);
-      if (display.length === 0) {
+      const allSessions = await this._fetchHistorySessions(30);
+      if (allSessions.length === 0) {
         container.style.display = 'none';
         return;
       }
 
-      // Build DOM safely (no innerHTML with user data)
       list.replaceChildren();
-      for (const s of display) {
-        const size =
-          s.sizeBytes < 1024
-            ? `${s.sizeBytes}B`
-            : s.sizeBytes < 1048576
-              ? `${(s.sizeBytes / 1024).toFixed(0)}K`
-              : `${(s.sizeBytes / 1048576).toFixed(1)}M`;
-        const date = new Date(s.lastModified);
-        const timeStr =
-          date.toLocaleDateString('en', { month: 'short', day: 'numeric' }) +
-          ' ' +
-          date.toLocaleTimeString('en', { hour: '2-digit', minute: '2-digit', hour12: false });
-        const shortDir = s.workingDir.replace(/^\/home\/[^/]+\//, '~/');
+      const initialCount = this._HISTORY_INITIAL_COUNT;
 
-        const item = document.createElement('div');
-        item.className = 'history-item';
-        item.title = s.workingDir;
-        item.addEventListener('click', () => this.resumeHistorySession(s.sessionId, s.workingDir));
+      // Render initial items
+      for (let i = 0; i < Math.min(initialCount, allSessions.length); i++) {
+        list.appendChild(this._buildHistoryItem(allSessions[i]));
+      }
 
-        const textCol = document.createElement('div');
-        textCol.className = 'history-item-text';
-
-        const titleSpan = document.createElement('span');
-        titleSpan.className = 'history-item-title';
-        titleSpan.textContent = s.firstPrompt || shortDir;
-
-        const subtitleSpan = document.createElement('span');
-        subtitleSpan.className = 'history-item-subtitle';
-        subtitleSpan.textContent = shortDir;
-
-        textCol.append(titleSpan, subtitleSpan);
-
-        const metaSpan = document.createElement('span');
-        metaSpan.className = 'history-item-meta';
-        metaSpan.textContent = timeStr;
-
-        const sizeSpan = document.createElement('span');
-        sizeSpan.className = 'history-item-size';
-        sizeSpan.textContent = size;
-
-        item.append(textCol, metaSpan, sizeSpan);
-        list.appendChild(item);
+      // Add "Show More" button if there are more items
+      if (allSessions.length > initialCount) {
+        const moreBtn = document.createElement('button');
+        moreBtn.className = 'history-show-more';
+        moreBtn.textContent = `Show ${allSessions.length - initialCount} more`;
+        moreBtn.addEventListener('click', () => {
+          for (let i = initialCount; i < allSessions.length; i++) {
+            list.insertBefore(this._buildHistoryItem(allSessions[i]), moreBtn);
+          }
+          moreBtn.remove();
+        });
+        list.appendChild(moreBtn);
       }
 
       container.style.display = '';

src/web/routes/session-routes.ts

@@ -182,6 +182,36 @@ export function registerSessionRoutes(
       }
     }
 
+    // Pre-validate resumeSessionId: check that the conversation file actually exists
+    // in Claude's projects directory. If not, skip resume to avoid confusing
+    // "No conversation found" errors from Claude CLI.
+    let validatedResumeId = body.resumeSessionId;
+    if (validatedResumeId) {
+      const projectsDir = join(process.env.HOME || '/tmp', '.claude', 'projects');
+      let found = false;
+      try {
+        const projectDirs = await fs.readdir(projectsDir);
+        for (const projDir of projectDirs) {
+          const sessionFile = join(projectsDir, projDir, `${validatedResumeId}.jsonl`);
+          try {
+            const stat = await fs.stat(sessionFile);
+            if (stat.size > 4000) {
+              found = true;
+              break;
+            }
+          } catch {
+            // File doesn't exist in this project dir
+          }
+        }
+      } catch {
+        // Projects dir doesn't exist
+      }
+      if (!found) {
+        console.log(`[Session] Resume session ${validatedResumeId} not found on disk, starting fresh`);
+        validatedResumeId = undefined;
+      }
+    }
+
     const globalNice = await ctx.getGlobalNiceConfig();
     const modelConfig = await ctx.getModelConfig();
     const mode = body.mode || 'claude';
@@ -203,7 +233,7 @@ export function registerSessionRoutes(
       claudeMode: claudeModeConfig.claudeMode,
       allowedTools: claudeModeConfig.allowedTools,
       openCodeConfig: mode === 'opencode' ? body.openCodeConfig : undefined,
-      resumeSessionId: body.resumeSessionId,
+      resumeSessionId: validatedResumeId,
     });
 
     ctx.addSession(session);
@@ -924,6 +954,74 @@ export function registerSessionRoutes(
     return undefined;
   }
 
+  /**
+   * Decode a Claude project key (e.g. "-Users-teigen-Documents-Workspace-AI-project-Mirror")
+   * back to a filesystem path ("/Users/teigen/Documents/Workspace/AI_project/Mirror").
+   *
+   * Claude CLI encodes both '/' and '_' as '-', so each '-' in the key could be
+   * any of: '/' (path separator), '_' (underscore), or '-' (literal dash).
+   *
+   * Strategy: look-ahead matching. At each '-', try consuming multiple segments
+   * joined by '_' or '-' to find an existing child directory, then recurse.
+   * E.g. for segments [AI, project, Mirror] inside /Workspace:
+   *   try /Workspace/AI (no) -> /Workspace/AI_project (yes!) -> continue with [Mirror]
+   */
+  async function decodeProjectKey(projKey: string): Promise<string> {
+    const encoded = projKey.startsWith('-') ? projKey.slice(1) : projKey;
+    const segments = encoded.split('-');
+
+    const isDir = async (p: string): Promise<boolean> =>
+      fs
+        .stat(p)
+        .then((s) => s.isDirectory())
+        .catch(() => false);
+
+    let current = '';
+    let i = 0;
+
+    while (i < segments.length) {
+      // Try progressively longer child names by joining segments with '_' or '-'
+      let matched = false;
+      // Limit look-ahead to avoid excessive fs checks (max 4 segments per component)
+      const maxLook = Math.min(i + 4, segments.length);
+      for (let end = i; end < maxLook; end++) {
+        // Build candidate child name from segments[i..end]
+        // Try all separator combinations: for 2+ segments, try '_' first then '-'
+        const candidates: string[] = [];
+        if (end === i) {
+          candidates.push(segments[i]);
+        } else {
+          // Build with underscores between joined segments
+          candidates.push(segments.slice(i, end + 1).join('_'));
+          // Build with dashes (literal)
+          candidates.push(segments.slice(i, end + 1).join('-'));
+        }
+
+        for (const child of candidates) {
+          const candidate = current + '/' + child;
+          if (await isDir(candidate)) {
+            current = candidate;
+            i = end + 1;
+            matched = true;
+            break;
+          }
+        }
+        if (matched) break;
+      }
+      if (!matched) {
+        // No directory match found — append as-is and move on
+        current = current + '/' + segments[i];
+        i++;
+      }
+    }
+
+    const finalExists = await fs
+      .access(current)
+      .then(() => true)
+      .catch(() => false);
+    return finalExists ? current : process.env.HOME || '/tmp';
+  }
+
   /** Read the first 16KB of a file for content sniffing. */
   async function readFileHead(path: string, buf: Buffer): Promise<string | null> {
     try {
@@ -974,15 +1072,11 @@ export function registerSessionRoutes(
         const stat = await fs.stat(projPath).catch(() => null);
         if (!stat?.isDirectory()) continue;
 
-        // Decode project key to working dir. The encoding replaces '/' with '-',
-        // which is lossy when path components contain '-'. Do naive decode first,
-        // then verify it exists. Fall back to HOME if the decoded path is invalid.
-        const naiveDecode = projDir.replace(/^-/, '/').replace(/-/g, '/');
-        const dirExists = await fs
-          .access(naiveDecode)
-          .then(() => true)
-          .catch(() => false);
-        const workingDir = dirExists ? naiveDecode : process.env.HOME || '/tmp';
+        // Decode project key to working dir. Claude CLI encodes '/' as '-',
+        // but path components may also contain '-' (e.g. "AI_project" vs "AI-project").
+        // Use recursive backtracking: try each '-' as either '/' or literal '-',
+        // verify which decoded path actually exists on disk.
+        const workingDir = await decodeProjectKey(projDir);
 
         const entries = await fs.readdir(projPath);
         for (const entry of entries) {
@@ -1004,24 +1098,31 @@ export function registerSessionRoutes(
           // Read first 16KB to check content and extract first user prompt.
           let firstPrompt: string | undefined;
           const head = await readFileHead(filePath, headBuf);
+          const hasConversation = (text: string) =>
+            text.includes('"type":"user"') || text.includes('"type":"assistant"') || text.includes('"type":"summary"');
 
-          if (fileStat.size < 50000) {
-            if (
-              !head ||
-              (!head.includes('"type":"user"') &&
-                !head.includes('"type":"assistant"') &&
-                !head.includes('"type":"summary"'))
-            ) {
-              continue; // No conversation content — skip
-            }
+          let foundContent = head ? hasConversation(head) : false;
+
+          // For large files, head may not contain user messages (e.g. /init followed
+          // by large system entries). Check the tail as well.
+          let tail: string | null = null;
+          if (!foundContent && fileStat.size > 16384) {
+            const tailBuf = Buffer.alloc(32768);
+            tail = await readFileTail(filePath, tailBuf, fileStat.size);
+            if (tail) foundContent = hasConversation(tail);
           }
+
+          if (!foundContent) continue; // No conversation content — skip
+
           if (head) firstPrompt = extractFirstUserPrompt(head);
 
           // If head scan found no usable prompt (e.g. session started with /init),
           // try reading the tail for a recent user message.
           if (!firstPrompt && fileStat.size > 65536) {
-            const tailBuf = Buffer.alloc(32768);
-            const tail = await readFileTail(filePath, tailBuf, fileStat.size);
+            if (!tail) {
+              const tailBuf = Buffer.alloc(32768);
+              tail = await readFileTail(filePath, tailBuf, fileStat.size);
+            }
             if (tail) firstPrompt = extractFirstUserPrompt(tail);
           }