fix(web-demo): drop Gemma free-mode hint from settings panel

The "Free mode: no coarse-fine / bracket gating" line was developer-
facing noise. The behavior still kicks in automatically when a Gemma
model is selected; we just don't surface it.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: greenpolo

web-demo/src/components/SettingsPanel.tsx

@@ -47,7 +47,6 @@ export function SettingsPanel() {
   const canEstimate = Boolean(selectedSlice) && !pipelineRunning;
 
   const estimateIsGemini = /gemini/i.test(estimateModel);
-  const estimateIsGemma = /gemma/i.test(estimateModel);
   // Demo brain ships pre-baked CLAHE variants. Uploaded brains don't have
   // them, so the per-stage CLAHE toggle has nothing to send — disable it.
   const selectedSliceHasClahe = Boolean(selectedSlice?.clahePath);
@@ -141,18 +140,6 @@ export function SettingsPanel() {
           />
         </div>
 
-        {estimateIsGemma && (
-          <div
-            style={{
-              fontFamily: "var(--font-mono)", fontSize: 10,
-              color: "var(--accent)", marginTop: 4,
-            }}
-            title="LangSlice-Gemma is fine-tuned for one-shot estimates"
-          >
-            Free mode: no coarse-fine / bracket gating
-          </div>
-        )}
-
         <details className="advanced-disclosure">
           <summary>Advanced</summary>
           <div className="advanced-body">