fix(web): stop auto-sending Ctrl+L from session selection paths (#99)

Claude Code 2.x treats Ctrl+L (\x0c) as a two-step "clear conversation"
command (first press shows the confirmation prompt, second press
clears). The frontend previously fired \x0c from three places to force
Ink to redraw stale CUP-positioned frames in the tailed buffer; if a
page refresh or SSE reconnect ran the same path twice within Claude's
confirmation window the second \x0c silently nuked the user's
conversation.

Removed the \x0c sends from:
- selectSession() — main offender, runs on every tab switch & page reload
- restoreTerminalSize() — manual "restore size" button
- sendPendingCtrlL() — dead code path (pendingCtrlL was never populated)

Trade-off: occasional stale Ink frames immediately after refresh; the
user's first keypress causes Ink to redraw and the artifact vanishes.
Losing the conversation silently is far worse than a brief cosmetic
glitch.

Co-authored-by: Teigen <teigen@TeigendeMac-mini.local>

src/web/public/app.js

@@ -2705,19 +2705,15 @@ class CodemanApp {
         });
       }
 
-      // Fire-and-forget resize + Ctrl+L to force Ink redraw.
-      // Tailed buffers accumulate stale CUP-positioned Ink frames that overlap
-      // in the viewport (e.g. duplicate "bypass permissions" bars). Ctrl+L
-      // triggers a full Ink redraw which overwrites all stale frame content.
-      // sendResize may be a no-op if dimensions match, so Ctrl+L is essential.
-      this.sendResize(sessionId).then(() => {
-        if (selectGen !== this._selectGeneration) return;
-        fetch(`/api/sessions/${sessionId}/input`, {
-          method: 'POST',
-          headers: { 'Content-Type': 'application/json' },
-          body: JSON.stringify({ input: '\x0c' })
-        }).catch(() => {});
-      });
+      // Fire-and-forget resize to nudge Ink via SIGWINCH on real size changes.
+      // Previously we also sent Ctrl+L (\x0c) here to force a full Ink redraw,
+      // but Claude Code 2.x treats Ctrl+L as a two-step "clear conversation"
+      // command — if a page refresh or SSE reconnect ran selectSession twice
+      // within Claude's confirmation window, the second \x0c silently wiped the
+      // conversation. Stale Ink frames in the tailed buffer are a cosmetic
+      // annoyance that disappear on the user's next keypress; data loss is not
+      // acceptable. Do NOT re-introduce Ctrl+L here.
+      this.sendResize(sessionId);
 
       // Defer secondary panel updates so they don't block the main thread
       // after terminal content is already visible.

src/web/public/terminal-ui.js

@@ -1704,7 +1704,8 @@ Object.assign(CodemanApp.prototype, {
   /**
    * Restore terminal size to match web UI dimensions.
    * Use this after mobile screen attachment has squeezed the terminal.
-   * Sends resize to PTY and Ctrl+L to trigger Claude to redraw.
+   * Sends only resize — SIGWINCH triggers Ink redraw on real dimension changes.
+   * Ctrl+L is NOT sent here (Claude Code 2.x treats it as "clear conversation").
    */
   async restoreTerminalSize() {
     if (!this.activeSessionId) {
@@ -1719,16 +1720,10 @@ Object.assign(CodemanApp.prototype, {
     }
 
     try {
-      // Send resize to restore proper dimensions (with minimum enforcement)
+      // Send resize to restore proper dimensions (with minimum enforcement).
+      // The PTY's SIGWINCH on real dim change is enough for Ink to redraw.
       await this.sendResize(this.activeSessionId);
 
-      // Send Ctrl+L to trigger Claude to redraw at new size
-      await fetch(`/api/sessions/${this.activeSessionId}/input`, {
-        method: 'POST',
-        headers: { 'Content-Type': 'application/json' },
-        body: JSON.stringify({ input: '\x0c' }),
-      });
-
       this.showToast(`Terminal restored to ${dims.cols}x${dims.rows}`, 'success');
     } catch (err) {
       console.error('Failed to restore terminal size:', err);
@@ -1736,26 +1731,20 @@ Object.assign(CodemanApp.prototype, {
     }
   },
 
-  // Send Ctrl+L to fix display for newly created sessions once Claude is running
-  sendPendingCtrlL(sessionId) {
-    if (!this.pendingCtrlL || !this.pendingCtrlL.has(sessionId)) {
-      return;
-    }
-    this.pendingCtrlL.delete(sessionId);
-
-    // Only send if this is the active session
-    if (sessionId !== this.activeSessionId) {
-      return;
-    }
-
-    // Send resize + Ctrl+L to fix the display (with minimum dimension enforcement)
-    this.sendResize(sessionId).then(() => {
-      fetch(`/api/sessions/${sessionId}/input`, {
-        method: 'POST',
-        headers: { 'Content-Type': 'application/json' },
-        body: JSON.stringify({ input: '\x0c' }),
-      });
-    });
+  // Legacy hook for newly-created sessions; kept as a no-op so the SSE
+  // idle/working handlers can still call it without conditional guards.
+  //
+  // Originally this sent Ctrl+L (\x0c) when a flagged session first reached
+  // idle/working to scrub mux-init junk from the screen. Two problems:
+  //   1. `pendingCtrlL` was never actually populated anywhere (dead path).
+  //   2. Claude Code 2.x interprets Ctrl+L as a two-step "clear conversation"
+  //      command — sending it from background flows risked nuking the user's
+  //      conversation if it coincided with another Ctrl+L (e.g. from
+  //      selectSession on page reload).
+  // If a per-session display-fix is ever needed again, do it via sendResize
+  // or an Ink-safe control sequence, NOT \x0c.
+  sendPendingCtrlL(_sessionId) {
+    // intentionally empty
   },
 
   async copyTerminal() {