refactor(console): phase 0 — remove dead code + fix channel/arg bugs

Zero-behavior-change cleanup ahead of the console refactor:
- Delete dead API/members: addCommandResult (unused), handleSelection (declared, no
  def), isAutoScrollEnabled (no callers), and scroll_to_bottom_ (written 8× but never
  read) with all its writes.
- Drop the unused screenToTextPos `line_height` parameter (+ 4 call sites) and the unused
  `segEnd` local — clears the two -Wunused warnings.
- Remove the toolbar filter checkboxes' dead `static bool s_prev_*` change-detectors,
  whose only effect was setting the dead scroll_to_bottom_.
- Fix the console_new_lines format/arg mismatch (format takes one %d; the call passed a
  spurious plural-suffix arg).
- Fix the channel/color incoherence: a "[daemon] error:" line kept red text but got a
  blue daemon bar — the prefix no longer downgrades an error channel.
- Delete 11 orphaned lite_console_* i18n keys left over from the console merge (keep
  lite_console_help_passthrough).

Full-node + lite build clean, ctest green.

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

src/ui/windows/console_tab.h

@@ -52,11 +52,6 @@ public:
      * @brief Clear console output
      */
     void clear();
-    
-    /**
-     * @brief Check if auto-scroll is enabled
-     */
-    bool isAutoScrollEnabled() const { return auto_scroll_; }
 
     // Scanline effect toggle (set from settings)
     static bool s_scanline_enabled;
@@ -98,7 +93,6 @@ private:
         int   channel = CH_NONE;
     };
 
-    void addCommandResult(const std::string& cmd, const std::string& result, bool is_error = false);
     // Format + color a completed command result (JSON-aware) into console lines.
     void addFormattedResult(const std::string& result, bool is_error);
     void renderStatusHeader(ConsoleCommandExecutor& exec);
@@ -108,7 +102,6 @@ private:
     void renderCommandsPopup();
     
     // Selection helpers
-    void handleSelection();
     std::string getSelectedText() const;
     void clearSelection();
     
@@ -117,7 +110,7 @@ private:
         int line = -1;
         int col = 0;
     };
-    TextPos screenToTextPos(ImVec2 screen_pos, float line_height) const;
+    TextPos screenToTextPos(ImVec2 screen_pos) const;
     bool isPosBeforeOrEqual(const TextPos& a, const TextPos& b) const;
     TextPos selectionStart() const;  // Returns the earlier of sel_anchor_ and sel_end_
     TextPos selectionEnd() const;    // Returns the later of sel_anchor_ and sel_end_
@@ -127,7 +120,6 @@ private:
     int history_index_ = -1;
     char input_buffer_[4096] = {0};
     bool auto_scroll_ = true;
-    bool scroll_to_bottom_ = false;
     float scroll_up_cooldown_ = 0.0f;    // seconds to wait before re-enabling auto-scroll
     int  new_lines_since_scroll_ = 0;     // new lines while scrolled up (for indicator)
     // (log-ingestion cursors + result queue moved to the ConsoleCommandExecutor)