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.

tools/generate_android_icons.py

@@ -25,6 +25,7 @@ SHELL_COLORS = {
     "blue": {"main": (35, 125, 235), "dark": (20, 85, 175), "light": (80, 165, 255)},
     "yellow": {"main": (255, 205, 10), "dark": (210, 160, 0), "light": (255, 230, 80)},
     "gold": {"main": (225, 170, 40), "dark": (170, 120, 20), "light": (245, 200, 80)},
+    "silver": {"main": (185, 190, 200), "dark": (130, 135, 145), "light": (225, 230, 240)},
 }
 
 def extract_cleaned_love_emblem():
@@ -186,7 +187,7 @@ def main():
         fg = create_adaptive_foreground(sizes["adaptive"])
         fg.save(os.path.join(drawable_dir, "ic_launcher_foreground.png"), "PNG")
         
-        for ver in ("red", "blue", "yellow", "gold"):
+        for ver in ("red", "blue", "yellow", "gold", "silver"):
             cart = render_3d_cartridge(ver, sizes["shortcut"])
             cart.save(os.path.join(drawable_dir, f"ic_shortcut_{ver}.png"), "PNG")