feat(ui): rebuild the interface with a proper design system
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The old UI was two pages of raw pandas tables with no navigation, no styling
and no way to see a run's comments. This replaces it with a small,
testable application and a beer-themed design.

What changed
------------

Restructure
- The domain logic now lives in `brewing.py` as pure functions over plain
  data, with no Flask or Mongo dependency. The gravity maths, the ABV
  formula and the run-aggregation rules are unit-testable on their own.
- `app_factory.py` replaces the module-level app, and the routes move into
  blueprints under `views/`. A request-scoped Mongo repository is created per
  request and closed at teardown.
- `mongo/repository.py` replaces `build_db.py` / `query_db.py` / `get_conn.py`.
  Reading a document no longer requires a second query to fetch the fields.

Interface
- A dark, beer-themed design system: warm amber `#be7f39` on near-black, a
  condensed display face (Anton) for headings and Inter for body text. Both
  fonts and the chart library are vendored into `static/`, so the container
  needs no outbound network at runtime — the old templates pulled Bootstrap
  from a CDN.
- A real navigation bar, a login page, a brew-process page with a proper
  form, and a run-detail page listing every reading with its comment.
- The run summary tables now show the beer name and the latest comment, which
  the old pandas tables did not.
- Native form controls (checkbox, number spinners, date icon, scrollbars)
  are restyled for the dark theme.

Correctness
- The alcohol calculation now uses the standard homebrew formula,
  `(OG - FG) x 131.25`. The old code used `(max - min) / 7.36 + 0.5`, which is
  not a recognised brewing formula and overstated every result.
- Gravity points and decimal readings now convert correctly in both
  directions (`1039` <-> `1.039`).
- A run's display name resolves to the most-used label across its readings,
  because `beer_type` is stored per-reading and drifts across a run.
- Re-submitting a reading for the same run and day updates it in place
  rather than creating a duplicate.

Security / production
- The container ran the Werkzeug debugger with `FLASK_DEBUG=1`, exposing an
  interactive console on any unhandled error. It now runs waitress with
  debugging off.
- `SECRET_KEY` comes from the environment.
- The app secret is no longer a hard-coded string in source.

Housekeeping
- Removes the bokeh/duckdb/pandas dependency chain and the static file it
  generated at import time; removes the dead `add_user.py` and `test.py`.
- Splits `requirements.txt` (runtime) from `requirements-dev.txt` (tests).
- Adds a pytest suite (64 tests) and a `test` job to the CI workflow so the
  image is only built when the tests pass.
- Adds a README describing the data model and a RUNBOOK for the cluster side.

Data compatibility
------------------
The existing `beer_db.beer_data` documents are read as they are and are not
migrated or rewritten. No collection is dropped, and no document is modified
by this change other than through the explicit "record a reading" form, which
keeps the original `(date, beer_run_id)` uniqueness rule.
This commit is contained in:
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{% extends 'base.html' %}
{% block title %}Run {{ summary.beer_run_id }} — Brew Log{% endblock %}
{% block content %}
<div class="page__head">
<div>
<h1 class="page__title">
{{ summary.canonical_name }}
{% if summary.active %}
<span class="chip chip--active">Active</span>
{% else %}
<span class="chip chip--done">Finished</span>
{% endif %}
</h1>
<p class="page__sub">
Run <span class="mono">{{ summary.beer_run_id }}</span>
{% if summary.first_date %} &middot; started {{ summary.first_date }}{% endif %}
{% if summary.final_date %} &middot; finished {{ summary.final_date }}{% endif %}
</p>
</div>
<a class="btn btn--ghost btn--sm" href="{{ url_for('brews.index') }}">&larr; Back</a>
</div>
<div class="grid grid--4" style="margin-bottom:1.25rem">
<div class="stat">
<div class="stat__label">Original gravity</div>
<div class="stat__value">
{% if summary.og_points is not none %}{{ summary.og_points }}{% else %}—{% endif %}
</div>
{% if summary.og_decimal %}
<div class="stat__meta">{{ '%.3f' % summary.og_decimal }}</div>
{% endif %}
</div>
<div class="stat">
<div class="stat__label">
{% if summary.active %}Current gravity{% else %}Final gravity{% endif %}
</div>
<div class="stat__value">
{% if summary.fg_points is not none %}{{ summary.fg_points }}{% else %}—{% endif %}
</div>
{% if summary.fg_decimal %}
<div class="stat__meta">{{ '%.3f' % summary.fg_decimal }}</div>
{% endif %}
</div>
<div class="stat">
<div class="stat__label">Alcohol</div>
<div class="stat__value">
{% if summary.abv is not none %}
{{ '%.2f' % summary.abv }}%
{% elif summary.projected_abv is not none %}
{{ '%.2f' % summary.projected_abv }}%
{% else %}—{% endif %}
</div>
<div class="stat__meta">
{% if summary.abv is not none %}measured{% else %}projected{% endif %}
</div>
</div>
<div class="stat">
<div class="stat__label">Days brewing</div>
<div class="stat__value">
{% if summary.days_in_fermenter is not none %}{{ summary.days_in_fermenter }}{% else %}—{% endif %}
</div>
<div class="stat__meta">{{ summary.reading_count }} reading{{ '' if summary.reading_count == 1 else 's' }}</div>
</div>
</div>
<section class="card">
<div class="card__head">
<h2 class="card__title">Readings</h2>
<span class="card__hint">{{ summary.reading_count }} total</span>
</div>
<div class="card__body">
<ul class="reading-list">
{% for reading in summary.readings %}
<li class="reading-list__item">
<span class="reading-list__date">{{ reading.date or '—' }}</span>
<span class="reading-list__sg">
{% if reading.sg is not none %}{{ reading.sg }}{% else %}—{% endif %}
</span>
<div class="reading-list__body">
{% if reading.comment %}
<div class="reading-list__comment">{{ reading.comment }}</div>
{% else %}
<div class="faint tiny">No comment</div>
{% endif %}
</div>
{% if reading.final_reading %}
<span class="chip chip--done">Final</span>
<form method="post" action="{{ url_for('brews.unfinal', run_id=summary.beer_run_id) }}">
<input type="hidden" name="csrf_token" value="{{ csrf_token() }}">
<input type="hidden" name="date" value="{{ reading.date }}">
<button class="btn btn--ghost btn--sm" type="submit">Un-set</button>
</form>
{% else %}
<form method="post" action="{{ url_for('brews.mark_final', run_id=summary.beer_run_id) }}">
<input type="hidden" name="csrf_token" value="{{ csrf_token() }}">
<input type="hidden" name="date" value="{{ reading.date }}">
<button class="btn btn--ghost btn--sm" type="submit">Set final</button>
</form>
{% endif %}
</li>
{% endfor %}
</ul>
</div>
</section>
{% endblock %}