chore(cpp/vendor): vendor Tabler Icons v3.41.1 (TTF + generador)

Vendorea el set de iconos Tabler (~5500 iconos, MIT) para usar en apps
ImGui via icon_font_cpp_core. Incluye:

- tabler-icons.ttf       — atlas TTF para mergear en ImGui
- tabler-icons.css       — referencia de codepoints (no se compila)
- gen_header.py          — script que regenera cpp/functions/core/icons_tabler.h
                           con macros TI_<NAME> a partir del CSS
- LICENSE / README.md    — atribucion MIT

Versionar el TTF (~700 KB) evita depender de descargas en build. Las apps
usan TI_* en strings y el atlas se carga con icon_font_cpp_core::load().

cpp/vendor/tabler-icons/LICENSE

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+MIT License
+
+Copyright (c) 2020-2026 Paweł Kuna
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

cpp/vendor/tabler-icons/README.md

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+# Tabler Icons (vendored webfont)
+
+- Version: 3.41.1
+- Source: https://github.com/tabler/tabler-icons
+- Package: `@tabler/icons-webfont@3.41.1` (jsdelivr CDN)
+- License: MIT (see LICENSE)
+
+Files:
+- `tabler-icons.ttf` — TrueType font (2.7 MB), Private Use Area codepoints U+E000..U+F8FF
+- `LICENSE` — MIT license
+
+Header with `TI_*` macros for every glyph: `cpp/functions/core/icons_tabler.h`
+(generated from the official `tabler-icons.css` of this same version).
+
+To upgrade: bump the version, redownload `.ttf` and `.css`, rerun the generator
+in `cpp/vendor/tabler-icons/gen_header.py`.

cpp/vendor/tabler-icons/gen_header.py

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+#!/usr/bin/env python3
+"""Genera cpp/functions/core/icons_tabler.h a partir del CSS oficial de Tabler.
+
+Uso:
+    cd cpp/vendor/tabler-icons
+    python3 gen_header.py
+
+Lee tabler-icons.css (descargado desde el npm package @tabler/icons-webfont) y
+escribe ../../functions/core/icons_tabler.h con un #define TI_<NAME> "<utf8>"
+para cada glyph.
+"""
+import re
+import sys
+from pathlib import Path
+
+HERE = Path(__file__).parent
+CSS = HERE / "tabler-icons.css"
+OUT = HERE / ".." / ".." / "functions" / "core" / "icons_tabler.h"
+OUT = OUT.resolve()
+
+VERSION_RE = re.compile(r"Tabler Icons\s+([\d.]+)")
+RULE_RE = re.compile(r"\.ti-([a-z0-9-]+):before\s*\{\s*content:\s*\"\\([0-9a-fA-F]+)\"")
+
+
+def to_utf8_escape(codepoint: int) -> str:
+    """Devuelve la cadena UTF-8 del codepoint en hex escapado para C strings."""
+    return "".join(f"\\x{b:02x}" for b in chr(codepoint).encode("utf-8"))
+
+
+def name_to_macro(name: str) -> str:
+    return "TI_" + name.upper().replace("-", "_")
+
+
+def main() -> int:
+    if not CSS.exists():
+        sys.stderr.write(f"missing {CSS}\n")
+        return 1
+
+    text = CSS.read_text(encoding="utf-8")
+    m = VERSION_RE.search(text)
+    version = m.group(1) if m else "unknown"
+
+    entries = []
+    seen = set()
+    for name, hexcp in RULE_RE.findall(text):
+        macro = name_to_macro(name)
+        if macro in seen:
+            continue
+        seen.add(macro)
+        cp = int(hexcp, 16)
+        entries.append((macro, cp, to_utf8_escape(cp)))
+
+    entries.sort(key=lambda e: e[0])
+
+    lines = [
+        "#pragma once",
+        "",
+        "// Tabler Icons codepoints — generado por cpp/vendor/tabler-icons/gen_header.py",
+        f"// Version: {version}",
+        "// Fuente: https://github.com/tabler/tabler-icons (MIT)",
+        "//",
+        "// Uso:",
+        "//   #include \"core/icons_tabler.h\"",
+        "//   icon_button(\"##rl\", TI_REFRESH, \"Reload\");",
+        "//   button(TI_DEVICE_FLOPPY \" Save\", V::Primary);",
+        "//",
+        "// El glyph SOLO se renderiza si la fuente Tabler esta cargada (mergeada en el",
+        "// atlas de ImGui via fn_ui::load_default_fonts). Sin esa carga, los TI_* salen",
+        "// como cuadritos vacios.",
+        "",
+        f"#define TI_FONT_VERSION \"{version}\"",
+        "#define TI_ICON_MIN 0xE000",
+        "#define TI_ICON_MAX 0xF8FF",
+        "",
+    ]
+    for macro, cp, utf8 in entries:
+        lines.append(f"#define {macro:<48} \"{utf8}\" // U+{cp:04X}")
+    lines.append("")
+
+    OUT.write_text("\n".join(lines), encoding="utf-8")
+    print(f"wrote {OUT} ({len(entries)} icons, version {version})")
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())