v1.1.0: explorer tab, bootstrap fixes, full theme overlay merge

Explorer tab:
- New block explorer tab with search, chain stats, mempool info,
  recent blocks table, block detail modal with tx expansion
- Sidebar nav entry, i18n strings, ui.toml layout values

Bootstrap fixes:
- Move wizard Done handler into render() — was dead code, preventing
  startEmbeddedDaemon() and tryConnect() from firing post-wizard
- Stop deleting BDB database/ dir during cleanup — caused LSN mismatch
  that salvaged wallet.dat into wallet.{timestamp}.bak
- Add banlist.dat, db.log, .lock to cleanup file list
- Fatal extraction failure for blocks/ and chainstate/ files
- Verification progress: split SHA-256 (0-50%) and MD5 (50-100%)

Theme system:
- Expand overlay merge to apply ALL sections (tabs, dialogs, components,
  screens, flat sections), not just theme+backdrop+effects
- Add screens and security section parsing to UISchema
- Build-time theme expansion via expand_themes.py (CMake + build.sh)

Other:
- Version bump to 1.1.0
- WalletState::clear() resets all fields (sync, daemon info, etc.)
- Sidebar item-height 42 → 36

scripts/expand_themes.py

@@ -0,0 +1,122 @@
+#!/usr/bin/env python3
+"""
+Build-time theme expander — merges layout sections from ui.toml into skin files.
+
+Called by CMake during build. Reads source skin files + ui.toml, writes merged
+output files to the build directory. Source files are never modified.
+
+Usage:
+    python3 expand_themes.py <source_themes_dir> <output_themes_dir>
+
+For each .toml file in source_themes_dir (except ui.toml), the script:
+  1. Copies the skin file contents (theme/palette/backdrop/effects)
+  2. Appends all layout sections from ui.toml (fonts, tabs, components, etc.)
+  3. Writes the merged result to output_themes_dir/<filename>
+
+ui.toml itself is copied unchanged.
+"""
+
+import re
+import sys
+import os
+
+# Sections to SKIP when extracting from ui.toml (theme-specific, already in skins)
+SKIP_SECTIONS = {"theme", "theme.palette", "backdrop", "effects"}
+
+
+def extract_layout_sections(ui_toml_path):
+    """Extract non-theme sections from ui.toml as a string."""
+    sections = []
+    current_section = None
+    current_lines = []
+    section_re = re.compile(r'^\[{1,2}([^\]]+)\]{1,2}\s*$')
+
+    with open(ui_toml_path, 'r') as f:
+        for line in f:
+            m = section_re.match(line.strip())
+            if m:
+                if current_section is not None or current_lines:
+                    sections.append((current_section, current_lines))
+                current_section = m.group(1).strip()
+                current_lines = [line]
+            else:
+                current_lines.append(line)
+    if current_section is not None or current_lines:
+        sections.append((current_section, current_lines))
+
+    layout_parts = []
+    for section_name, lines in sections:
+        if section_name is None:
+            # Preamble: only include top-level key=value lines
+            kv_lines = [l for l in lines
+                        if l.strip() and not l.strip().startswith('#') and '=' in l]
+            if kv_lines:
+                layout_parts.append(''.join(kv_lines))
+            continue
+        if section_name in SKIP_SECTIONS:
+            continue
+        layout_parts.append(''.join(lines))
+
+    return '\n'.join(layout_parts)
+
+
+def main():
+    if len(sys.argv) != 3:
+        print(f"Usage: {sys.argv[0]} <source_themes_dir> <output_themes_dir>")
+        sys.exit(1)
+
+    src_dir = sys.argv[1]
+    out_dir = sys.argv[2]
+    ui_toml = os.path.join(src_dir, "ui.toml")
+
+    if not os.path.exists(ui_toml):
+        print(f"ERROR: ui.toml not found at {ui_toml}")
+        sys.exit(1)
+
+    os.makedirs(out_dir, exist_ok=True)
+
+    layout_content = extract_layout_sections(ui_toml)
+
+    separator = (
+        "\n# ===========================================================================\n"
+        "# Layout & Component Properties\n"
+        "# All values below can be customized per-theme. Edit and save to see\n"
+        "# changes reflected in the app in real time via hot-reload.\n"
+        "# ===========================================================================\n\n"
+    )
+
+    for fname in sorted(os.listdir(src_dir)):
+        if not fname.endswith('.toml'):
+            continue
+        src_path = os.path.join(src_dir, fname)
+        dst_path = os.path.join(out_dir, fname)
+
+        if fname == "ui.toml":
+            # Copy ui.toml unchanged
+            with open(src_path, 'r') as f:
+                content = f.read()
+            with open(dst_path, 'w') as f:
+                f.write(content)
+            print(f"  COPY {fname}")
+            continue
+
+        # Skin file — append layout sections
+        with open(src_path, 'r') as f:
+            skin = f.read()
+        if not skin.endswith('\n'):
+            skin += '\n'
+
+        merged = skin + separator + layout_content
+        if not merged.endswith('\n'):
+            merged += '\n'
+
+        with open(dst_path, 'w') as f:
+            f.write(merged)
+        lines = merged.count('\n')
+        print(f"  MERGE {fname} → {lines} lines")
+
+    print("Done.")
+
+
+if __name__ == "__main__":
+    main()