fix(ui): clamp tooltips to a comfortable width instead of spanning the screen

Audited every tooltip. The shared helper material::Tooltip wrapped ImGui's
SetTooltip with no width limit, so a long tooltip laid out on one line and
stretched across the whole display — most visible on the newly reworded
note/consolidation tooltips. 258 call sites go through this helper, so the fix is
central:

- material::Tooltip / BeginTooltip now push a text wrap position (420 logical px,
  DPI-scaled) so long text wraps to a comfortable column; short text is
  unaffected (it's already narrower). A caller that pushes its own wrap pos nests
  cleanly. Also fixes a latent style-stack leak when ImGui::BeginTooltip returns
  false (the pushed style is now popped).

Six sites bypassed the helper with raw ImGui tooltips. The two that actually
stretched are migrated to material::Tooltip: the alert/bell toast-hover showing a
full (now ~250-char) message, and the wallets dialog's folder-path hover. The
chat over-cap tooltip is migrated too for consistency. The remaining three
(two wallet-recovery dialog tips, the chat composer's parts tooltip) already
clamp via their own PushTextWrapPos and are left as-is.

Build + tests + hygiene green.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/ui/material/tooltip_style.h

@@ -36,27 +36,52 @@ inline void PopTooltipStyle()
     ImGui::PopStyleVar();
 }
 
-// Drop-in replacement for ImGui::SetTooltip (same printf-style signature). (No IM_FMTARGS: GCC
-// rejects the format attribute on an inline definition; call sites already passed SetTooltip's check.)
+// Comfortable maximum tooltip text width (logical px, scaled by DPI). Long tooltip text wraps at this
+// instead of stretching across the whole screen; short text is unaffected (it's narrower than the cap).
+inline constexpr float kTooltipWrapWidth = 420.0f;
+
+// The wrap position (window-local x) to clamp a just-begun tooltip's text to. Called right after
+// ImGui::BeginTooltip, when the cursor sits at the tooltip's content origin.
+inline float tooltipWrapPosX()
+{
+    return ImGui::GetCursorPosX() + kTooltipWrapWidth * Layout::dpiScale();
+}
+
+// Drop-in replacement for ImGui::SetTooltip (same printf-style signature), with the text clamped to a
+// comfortable width. (No IM_FMTARGS: GCC rejects the format attribute on an inline definition; call sites
+// already passed SetTooltip's check.)
 inline void Tooltip(const char* fmt, ...)
 {
     PushTooltipStyle();
-    va_list args;
-    va_start(args, fmt);
-    ImGui::SetTooltipV(fmt, args);
-    va_end(args);
+    if (ImGui::BeginTooltip()) {
+        ImGui::PushTextWrapPos(tooltipWrapPosX());
+        va_list args;
+        va_start(args, fmt);
+        ImGui::TextV(fmt, args);
+        va_end(args);
+        ImGui::PopTextWrapPos();
+        ImGui::EndTooltip();
+    }
     PopTooltipStyle();
 }
 
-// Drop-in replacements for ImGui::BeginTooltip / ImGui::EndTooltip (must be paired, as before).
+// Drop-in replacements for ImGui::BeginTooltip / ImGui::EndTooltip (must be paired, as before). The begin
+// clamps text to a comfortable width by default; a caller that pushes its own wrap pos nests cleanly (it
+// pops back to this one). Text-only callers need do nothing; non-text content ignores the wrap pos.
 inline bool BeginTooltip()
 {
     PushTooltipStyle();
-    return ImGui::BeginTooltip();
+    if (ImGui::BeginTooltip()) {
+        ImGui::PushTextWrapPos(tooltipWrapPosX());
+        return true;
+    }
+    PopTooltipStyle();   // not shown: EndTooltip won't run, so undo the style push here
+    return false;
 }
 
 inline void EndTooltip()
 {
+    ImGui::PopTextWrapPos();   // pair the wrap pos pushed in BeginTooltip
     ImGui::EndTooltip();
     PopTooltipStyle();
 }

src/ui/notifications.cpp

@@ -6,6 +6,7 @@
 #include "schema/ui_schema.h"
 #include "material/type.h"
 #include "material/draw_helpers.h"
+#include "material/tooltip_style.h"   // material::Tooltip (width-clamped)
 #include "../embedded/IconsMaterialDesign.h"
 #include "imgui.h"
 
@@ -210,7 +211,7 @@ void Notifications::render()
         if (ImGui::IsMouseClicked(ImGuiMouseButton_Left)) requestHistory();
     }
     if (toast_hovered_ && clipped)
-        ImGui::SetTooltip("%s", notif.message.c_str());
+        material::Tooltip("%s", notif.message.c_str());   // wrapped: a long alert message mustn't span the screen
 }
 
 } // namespace ui

src/ui/windows/chat_tab.cpp

@@ -2216,7 +2216,7 @@ void RenderChatTab(App* app)
             // When Send is disabled *because the message is over the cap*, explain why on hover — the
             // gauge went red but the numeric reason is no longer always-visible.
             if (overCap && ImGui::IsItemHovered(ImGuiHoveredFlags_AllowWhenDisabled))
-                ImGui::SetTooltip("%s  %d / %d", TR("chat_len_over"), used, kBodyMaxBytes);
+                material::Tooltip("%s  %d / %d", TR("chat_len_over"), used, kBodyMaxBytes);
             ImGui::PopStyleColor(3);
 
             if (submit && s_compose[0] != '\0' && !overCap) {

src/ui/windows/wallets_dialog.h

@@ -39,6 +39,7 @@
 #include "../layout.h"
 #include "../material/colors.h"
 #include "../material/draw_helpers.h"
+#include "../material/tooltip_style.h"   // material::Tooltip (width-clamped)
 #include "../material/type.h"
 #include "folder_picker.h"
 
@@ -557,7 +558,7 @@ public:
                         ImGui::AlignTextToFramePadding();
                         const float textW = listW - bh2 - 2.0f * Layout::spacingSm();
                         Type().textColored(TypeStyle::Caption, OnSurface(), elideFront(folder, textW).c_str());
-                        if (ImGui::IsItemHovered()) ImGui::SetTooltip("%s", folder.c_str());
+                        if (ImGui::IsItemHovered()) material::Tooltip("%s", folder.c_str());   // wrapped: long paths
                         ImGui::PopID();
                     }
                     if (!toRemove.empty()) {