style(theme): make Jade's gold vein follow rounded corners

Jade's edge-trace hero hand-walked the panel perimeter as straight line
segments, so rounded corners chamfered into flat polygons. Retire it in
favour of the gradient-border effect, which draws via AddRect and hugs
the real corner arcs.

- theme_effects: drawGradientBorderShift gains phaseOffset + alphaMul;
  drawPanelEffects now draws it on every glass panel (position-phased so
  panels drift like veins at different depths, 0.6x alpha vs the active
  nav button), gated behind a new opt-in gradient-border-panels flag so
  button-only themes (Obsidian) are unaffected.
- jade.toml: edge-trace off; gradient-border-panels on, speed 0.10,
  jade->gold; jade motes + viewport wash/vignette kept.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/ui/effects/theme_effects.cpp

@@ -160,6 +160,10 @@ void ThemeEffects::loadFromTheme() {
 
     // ---- Gradient Border Shift ----
     gradient_border_.enabled   = eff("gradient-border-enabled").sizeOr(0.0f) > 0.5f;
+    // Opt-in: also draw the shifting border on every glass panel (not just the
+    // active nav button). Off by default so themes that only want the button
+    // accent (e.g. Obsidian) are unaffected; Jade turns it on as its hero.
+    gradient_border_.panels    = eff("gradient-border-panels").sizeOr(0.0f) > 0.5f;
     gradient_border_.speed     = eff("gradient-border-speed").sizeOr(0.15f);
     gradient_border_.thickness = eff("gradient-border-thickness").sizeOr(1.5f);
     gradient_border_.alpha     = eff("gradient-border-alpha").sizeOr(0.6f);
@@ -512,11 +516,15 @@ void ThemeEffects::drawGlowPulse(ImDrawList* dl, ImVec2 pMin, ImVec2 pMax,
 // ============================================================================
 
 void ThemeEffects::drawGradientBorderShift(ImDrawList* dl, ImVec2 pMin, ImVec2 pMax,
-                                            float rounding) const {
+                                            float rounding, float phaseOffset,
+                                            float alphaMul) const {
     if (!enabled_ || !gradient_border_.enabled) return;
 
-    // Smooth sinusoidal oscillation between color A and color B
-    float phase = std::sin(time_ * gradient_border_.speed * 2.0f * 3.14159265f) * 0.5f + 0.5f;
+    // Smooth sinusoidal oscillation between color A and color B.
+    // phaseOffset shifts where in the cycle this element sits so a wall of
+    // panels reads like veins at different depths rather than one pulse.
+    float phase = std::sin((time_ * gradient_border_.speed + phaseOffset)
+                           * 2.0f * 3.14159265f) * 0.5f + 0.5f;
 
     // Extract RGBA from both colors and lerp
     RGB ca = unpackRGB(gradient_border_.colorA);
@@ -525,7 +533,7 @@ void ThemeEffects::drawGradientBorderShift(ImDrawList* dl, ImVec2 pMin, ImVec2 p
     int r = ca.r + (int)((cb.r - ca.r) * phase);
     int g = ca.g + (int)((cb.g - ca.g) * phase);
     int b = ca.b + (int)((cb.b - ca.b) * phase);
-    int a = scaledAlpha(gradient_border_.alpha, bgOpacity_);
+    int a = scaledAlpha(gradient_border_.alpha * alphaMul, bgOpacity_);
 
     // Draw the shifting border
     dl->AddRect(pMin, pMax, IM_COL32(r, g, b, a),
@@ -896,6 +904,22 @@ void ThemeEffects::drawPanelEffects(ImDrawList* dl, ImVec2 pMin, ImVec2 pMax,
                                      float rounding) const {
     if (!enabled_ || effects::isLowSpecMode()) return;
 
+    // Gradient border on panels — a slow color-shifting outline that hugs the
+    // panel's rounded corners (drawn via AddRect, so it follows the rounding
+    // exactly — no polygonal corners). Position-based phase offset makes each
+    // panel drift like a vein at a different depth; softer than the active
+    // nav button (alphaMul 0.6) so a screenful of panels stays calm.
+    if (gradient_border_.enabled && gradient_border_.panels) {
+        float w = pMax.x - pMin.x;
+        float h = pMax.y - pMin.y;
+        if (w > 80 && h > 40) { // skip small panels
+            float posKey = (pMin.x * 0.0073f + pMin.y * 0.0137f);
+            posKey = posKey - (int)posKey; // fractional 0..1
+            if (posKey < 0) posKey += 1.0f;
+            drawGradientBorderShift(dl, pMin, pMax, rounding, posKey, 0.6f);
+        }
+    }
+
     // Edge trace on panels — use position-based phase offset so each
     // panel's tracer is at a different position around the border
     if (edge_trace_.enabled) {

src/ui/effects/theme_effects.h

@@ -69,9 +69,12 @@ public:
     void drawEdgeTrace(ImDrawList* dl, ImVec2 pMin, ImVec2 pMax,
                        float rounding) const;
 
-    /// Draw a border that shifts between two colors over time (gem-like)
+    /// Draw a border that shifts between two colors over time (gem-like).
+    /// phaseOffset (0..1) shifts this element's point in the color cycle so
+    /// many panels don't pulse in unison; alphaMul scales the whole effect.
     void drawGradientBorderShift(ImDrawList* dl, ImVec2 pMin, ImVec2 pMax,
-                                 float rounding) const;
+                                 float rounding, float phaseOffset = 0.0f,
+                                 float alphaMul = 1.0f) const;
 
     /// Draw ember particles that rise from an element (fire theme)
     void drawEmberRise(ImDrawList* dl, ImVec2 pMin, ImVec2 pMax) const;
@@ -186,6 +189,7 @@ private:
 
     struct GradientBorderConfig {
         bool enabled = false;
+        bool panels = false;       ///< also draw on glass panels, not just the active nav button
         float speed = 0.15f;       ///< full color shift cycles per second
         float thickness = 1.5f;    ///< border line thickness in pixels
         float alpha = 0.6f;        ///< peak alpha