Design: every offer verb has a hint, shown on hover — and the status line wraps

Mirror of snaporca 2b3e890165 (DesignPanel.cpp applied as a patch; parity 30 / 16, shared
files byte-identical).

All 86 verbs now carry a hint: 55 extracted from the C++ tool definitions so the offer and
the armed-tool hint cannot drift, 31 written by hand. One wxEVT_MENU_HIGHLIGHT binding
shows the hovered verb's hint in the status line. The generator asserts that no wired verb
lacks one.

Also: all 200 status writes go through set_status(), which wraps instead of clipping at the
panel edge; and the empty-document hint is called from on_tab_shown() as well, since
after_tree_edit() never runs on a freshly opened tab.

Verified on the rig.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LyRwbuq6fjn3VV9U9UvhBM

src/slic3r/GUI/DesignPanel.hpp

@@ -624,6 +624,10 @@ private:
     std::map<std::string, std::function<void()>> m_verb_actions;
     // Append an offer row with its toolbar glyph. The bitmap must be set BEFORE Append —
     // wxGTK builds the GtkMenuItem there and only makes an image item if one is present.
+    // Every status write goes through here so long hints wrap instead of clipping.
+    void        set_status(const wxString& text);
+    wxString    idle_hint() const;   // what to say when nothing is selected
+
     wxMenuItem* append_offer_item(wxMenu* menu, int id, const wxString& text,
                                   const struct OfferVerb& v);
     void show_offer_menu(const wxPoint& screen_pos);