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/services/portfolio_analysis.py

@@ -250,6 +250,19 @@ implies X under scenario Y"), not advice ("buy X" / "sell Y" are forbidden).
   what would invalidate the current posture.
 - ~350 words. No bullet lists. No buy/sell recommendations.
 - Do not repeat the input data verbatim — interpret it.
+
+# Rational vs irrational lens (mandatory)
+Carry the base prompt's rational-vs-irrational framing through to every
+paragraph of the portfolio read. For each section above, contrast:
+- The RATIONAL read: what the underlying factors (fundamentals,
+  macro/policy regime, valuation, currency dynamics) justify for this
+  exposure;
+- The IRRATIONAL read: what positioning, narrative momentum, sentiment
+  or flows are doing to that same exposure right now.
+Then name the GAP — does the holder's posture line up with the rational
+read, or is it riding the irrational one? A paragraph that names only
+the pie's numbers or only the macro backdrop, without placing the
+holding on this rational-vs-irrational axis, is incomplete.
 """