feat(eosdash): plan page with EMS plan timeline and persisted settings (#1460)

* feat(eosdash): plan page with EMS plan timeline and persisted settings

Fixes:
- SolutionCard no longer appends to the module-level solution_excludes
  list on every render (the list grew without limit).
- All EOSdash pages: keep the scroll position after htmx actions instead
  of jumping to the bottom; Bokeh() reserves the plot height.
- Default visible PV column pvforecast_power_w -> pvforecast_ac_energy_wh
  (the old column no longer exists).
- All EOSdash pages: remove w-screen from components.Page (horizontal
  scrollbar).
- Solution chart: energy is the main axis; the always empty power axis is
  only shown with power columns. Typo "Electricty" fixed.

Features:
- EMS plan timeline per device, plan table as collapsible section.
- Solution chart rework: KPI row, legend, totals view, value axes for the
  displayed columns only, units menu, currency from the timezone, aligned
  time axes with the timeline, themed tooltips, system font.
- Per-column and per-command settings: visibility, alias, color, style;
  device aliases.
- New config section eosdash.plan (server/dash/dashsettings.py) stores the
  plan page settings in the EOS configuration; docs regenerated.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: SchaafAlexander <86607129+SchaafAlexander@users.noreply.github.com>

tests/testdata/docs/_generated/config.md

@@ -9,6 +9,7 @@
 ../_generated/configelecfee.md
 ../_generated/configelecprice.md
 ../_generated/configems.md
+../_generated/configeosdash.md
 ../_generated/configfeedintariff.md
 ../_generated/configgeneral.md
 ../_generated/configload.md