ui: aggregated read on top, hide stale rows, wire /log tone toggle; prompts v8

- dashboard grid: explicit "header" area as the first row so the
    aggregated read panel renders at the top instead of being
    auto-placed after the named areas.
  - indicators: hide rows flagged stale (older than the group's
    freshness threshold). Server still computes stale_symbols;
    rendering can be re-enabled by removing the
    `{% if not is_stale %}` wrapper in indicators.html.
  - /log: add tone-changed to #log-content's hx-trigger and include
    it in cassandraSetTone's selector list — toggling Novice /
    Intermediate on the Log page was previously a no-op.
  - prompts: bump PROMPT_VERSION 7→8. Strengthen the rational-vs-
    irrational framing in the strategic-log system prompt from
    aspirational to mandatory ("a paragraph without both lenses must
    be rewritten"). Require the same lens in the per-group summary,
    cross-asset aggregate, and portfolio commentary overrides.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

app/templates/base.html

@@ -106,7 +106,7 @@
       // listen to. Simpler still: fire htmx.trigger on the well-known
       // panels. We use the simple path.
       ['#dash-header-container', '#log-panel .panel-body',
-       '#indicators-body'].forEach(function (sel) {
+       '#indicators-body', '#log-content'].forEach(function (sel) {
         var el = document.querySelector(sel);
         if (el && window.htmx) window.htmx.trigger(el, 'tone-changed');
       });