fix(terminal): stop forwarding the wheel to codex, it ignores SGR reports

DodgyBadger reported a completely dead wheel in codex tabs (#227 comment)
while the scrollbar drag worked, and the [scroll] line confirmed the
branch: forward-sgr with 967 rows of healthy local scrollback unused.

Measured against codex-cli 0.147.0 in a bare tmux: codex never enables
mouse tracking (mouse_any_flag=0), runs an inline viewport
(alternate_on=0) and pushes its transcript into the terminal's own
scrollback (history_size grows), and SGR wheel reports written to its
pane change nothing at all. Hand-encoded SGR taps are no-ops too, so
they stay (harmless), which means click-to-position is merely
unavailable there rather than damaging.

_shouldForwardWheelToApp now returns true for claude >= 2.1.187 and
nothing else; codex falls to the local-scrollback path like
shell/gemini/opencode, which is the same history the scrollbar drag was
already reaching. The claude-only PageUp fallback is untouched.

Verified in Chromium against a live codex session on an isolated
instance: routing logs local-scrollback, the viewport moves 39 -> 4 and
zero bytes go to the PTY.

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

src/web/public/index.html

@@ -1322,7 +1322,7 @@
               </div>
               <!-- Input Section -->
               <div class="settings-section-header">Input</div>
-              <div class="settings-item settings-item-multiline" title="Scroll the terminal's own local scrollback with a plain mouse wheel / two-finger swipe, instead of forwarding the wheel to the CLI's transcript. Leave OFF for Claude/Codex sessions: those CLIs redraw the screen in place and keep no local scrollback, so the wheel would have almost nothing to scroll. In Claude sessions Codeman then falls back to paging the CLI's own transcript; Codex sessions have no such fallback, so the wheel goes dead. Shift+wheel always reaches local scrollback regardless.">
+              <div class="settings-item settings-item-multiline" title="Scroll the terminal's own local scrollback with a plain mouse wheel / two-finger swipe, instead of forwarding the wheel to the CLI's transcript. Only Claude sessions forward, so this setting only affects them: Claude redraws the screen in place and keeps almost no local scrollback, so with this ON the wheel has little to scroll and Codeman falls back to paging Claude's own transcript. Codex, Gemini, shell and OpenCode sessions always scroll local scrollback. Shift+wheel always reaches local scrollback regardless.">
                 <div class="settings-item-text">
                   <span class="settings-item-label">Wheel Scrolls Local History</span>
                   <span class="settings-item-desc">Plain wheel/trackpad pages the terminal scrollback</span>

src/web/public/terminal-ui.js

@@ -452,8 +452,8 @@ Object.assign(CodemanApp.prototype, {
     this.registerFilePathLinkProvider();
 
     // Mouse wheel: forward to the TUI only for sessions verified to handle SGR
-    // wheel reports (codex, and claude 2.1.187+ — see _shouldForwardWheelToApp),
-    // local scrollback otherwise. Claude Code 2.1.187+ scrolls its own
+    // wheel reports (claude 2.1.187+ — see _shouldForwardWheelToApp), local
+    // scrollback otherwise. Claude Code 2.1.187+ scrolls its own
     // transcript on SGR wheel reports — scrolled-away tool blocks re-render
     // live and stay clickable — and its select menus no longer capture wheel
     // as option navigation (verified against 2.1.202: /model menu highlight
@@ -3107,11 +3107,20 @@ Object.assign(CodemanApp.prototype, {
 
   // Wheel forwarding gate for the container wheel handler: no Shift override,
   // xterm's own encoder dormant, viewport at the bottom, and a TUI VERIFIED to
-  // scroll its transcript on SGR wheel reports: codex, or claude 2.1.187+
-  // (older Claude Code captures wheel as select-menu option navigation; an
-  // unknown version is treated as older). Gemini is a strip mode too but its
-  // wheel behavior is unverified, so it keeps the local wheel — taps/clicks
-  // are still forwarded for it (harmless no-ops at worst).
+  // scroll its transcript on SGR wheel reports — which today is claude 2.1.187+
+  // and nothing else (older Claude Code captures wheel as select-menu option
+  // navigation; an unknown version is treated as older). Gemini and codex are
+  // strip modes too but keep the local wheel — taps/clicks are still forwarded
+  // for them (harmless no-ops at worst).
+  //
+  // Codex USED to forward here and was the #227 regression (DodgyBadger, Codex
+  // latest / Chrome / Win11: dead wheel in codex, working scrollbar drag).
+  // Measured on codex-cli 0.147.0 in a bare tmux: it never enables mouse
+  // tracking (`mouse_any_flag=0`) and SGR wheel reports fed to its PTY change
+  // NOTHING on screen — it runs an inline viewport (`alternate_on=0`) and pushes
+  // its transcript into the terminal's own scrollback (tmux `history_size`
+  // grows), so there is no in-app pager to drive and local scrollback IS the
+  // codex transcript. Forwarding therefore swallowed every tick.
   // Wheel delta → whole scroll lines. macOS trackpads turn Shift+two-finger
   // scroll into a HORIZONTAL wheel (deltaY≈0, deltaX carries the magnitude), and
   // Shift routes the wheel to local scrollback (_shouldForwardWheelToApp returns
@@ -3165,11 +3174,8 @@ Object.assign(CodemanApp.prototype, {
     if (mode && mode !== 'none') return false;
     const session = this.sessions?.get(this.activeSessionId);
     const sessionMode = session?.mode || 'claude';
-    if (sessionMode === 'claude') {
-      if (!this._cliVersionAtLeast(session?.cliVersion, '2.1.187')) return false;
-    } else if (sessionMode !== 'codex') {
-      return false;
-    }
+    if (sessionMode !== 'claude') return false;
+    if (!this._cliVersionAtLeast(session?.cliVersion, '2.1.187')) return false;
     // Deliberately NOT gated on _terminalViewportAtBottom(). It used to be, so
     // that leaving the bottom handed the wheel back to local scrollback and both
     // histories stayed reachable without a mode switch. In practice that inverted