Pokemon Silver as a full launcher version, plus launcher mods-list and title-tempo fixes

Silver: derived import manifest (tools/make_silver_manifest.py re-resolves
the Gold manifest's symbols from pokesilver.sym), silver GameVersion row,
generation-keyed extractor routing, required-files override, edition save
stamping (a Silver playthrough no longer writes into the Gold save),
checkver-driven edition data, SILVER/KAMON/OSCAR/MAX presets, GOLD rival
default, edition credits banner, Lugia title screen (OAM layouts, bob,
trail, palettes as title.lua data keys with Gold defaults so old caches
need no re-import), packaging for every build target, docs, and tests.

Launcher: the installed-mods list is one continuous scroll (rows culled to
the viewport) instead of a pager with an inner scroll viewport; the pad
cursor's edge-scroll no longer runs it to the bottom. The game dropdown
shows just the initial and caret. Find-tab behavior unchanged.

Title tempo: a sprite-anim frame shows duration+1 ticks
(engine/sprite_anims/core.asm GetSpriteAnimFrame), which locks both
editions' 64-tick wing beat to the 64-tick sine bob; the title screens no
longer run fast and out of phase.

src/ui/kit/Theme.lua

@@ -64,6 +64,7 @@ local PAL = {
   railBlue    = { 70, 150, 255 },
   railGold    = { 255, 203, 5 },   -- Yellow cartridge (bright)
   railAmber   = { 218, 145, 32 },  -- Gold cartridge (deeper metal)
+  railSilver  = { 190, 198, 210 }, -- Silver cartridge (cool light metal)
 }
 -- Semantic aliases kept so ported call sites read the same as before.
 PAL.cardBorder = PAL.line
@@ -321,10 +322,12 @@ function Theme.meter(x, y, w, h, pct, c)
 end
 
 -- The 4px version rail across the top of both windows: the only brand
--- colour on screen (Red / Blue / Yellow / Gold cartridge colours).
+-- colour on screen (Red / Blue / Yellow / Gold / Silver cartridge colours).
 function Theme.versionRail(x, y, w, h)
   if not G then return end
-  local bars = { PAL.railRed, PAL.railBlue, PAL.railGold, PAL.railAmber }
+  local bars = {
+    PAL.railRed, PAL.railBlue, PAL.railGold, PAL.railAmber, PAL.railSilver,
+  }
   local seg = w / #bars
   for i, c in ipairs(bars) do
     Theme.fill(x + (i - 1) * seg, y, seg, h, c, 1)