feat(fires): FRP intensity filter, confidence switch and six-stop color ramp (HAL-676)

Color every FIRMS detection by fire radiative power on the Portolan
cold → hot ramp (blue · teal · lime · amber · orange · red at
0 · 5 · 20 · 50 · 100 · 300 MW), replacing the three warm stops that
made a 2 MW and a 40 MW fire look alike. Heat cells, glow sprites and
card accents all read the same ramp (src/data/firmsIntensity.js).

Add a minimum-FRP log slider whose track is painted with the ramp (so
it doubles as the legend), an All / Nominal+ / High confidence switch
and an "N of M shown" counter to the Active Fires row. The filter runs
once in ingestion.applyFilter(), so markers, cards, heat cells, the
context store, the top-fires query and the analyst records all see one
set. Default is 0 MW / All: many of the strongest fires are rated low.

Persist both options in the layer state (token w: minFrp `f`,
confidence `c`), including the short share codec, and give the agent's
get_active_fires tool matching min_frp_mw / confidence arguments.

Layer panel gains generic `slider` and `segmented` row descriptors
(src/ui/rowFilterControls.js). New strings in es / ru / zh-CN.

Co-Authored-By: Claude Fable 5.1 <[email protected]>

scripts/format-scope.json

@@ -1117,5 +1117,9 @@
   "src/testSupport/shareViewFixtures.mjs",
   "src/ui/shareLinks.test.mjs",
   "src/ui/shareButton.test.mjs",
-  "src/share/shareLinkPath.test.mjs"
+  "src/share/shareLinkPath.test.mjs",
+  "src/data/firmsIntensity.js",
+  "src/data/firmsIntensity.test.mjs",
+  "src/ui/rowFilterControls.js",
+  "src/ui/rowFilterControls.test.mjs"
 ]