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>