Implements ``Business/DataTools/app_icons.html`` §03 "Letter D (sans)"
as the canonical app mark.
- New ``src/gui/assets/datatools_icon.svg`` — 64×64 SVG, 14px corner
radius, ink ground (#1c1917), cream "D" (#fef4ed) in
Geist 700 / -0.04em tracking. Pure SVG so it renders sharp at
every favicon size; font stack falls back through Geist →
system sans where the webfont isn't installed (favicons can't load
Google Fonts).
- ``_home.py``, ``_Activate.py``, ``99_Close.py``: page_icon now
resolves the SVG path via ``Path(__file__).parent / "assets" /
"datatools_icon.svg"`` instead of the broom 🧹 / 🔑 / 🛑
emojis. Streamlit inlines it as a ``data:image/svg+xml;base64,...``
link tag so the browser tab + OS app-icon for ``python -m src.gui``
matches the sidebar chip.
- Sidebar ``.dt-brand-mark`` tightened to match the spec's "Letter D
(sans)" rendering: ``font-weight: 700`` and
``letter-spacing: -0.04em`` (was 600 / -0.02em). The on-screen
chip is now a scaled-up copy of the OS icon.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Michael
6c3939d21b