Twin-stick combat: aim and fire with a second stick, MOBA-style ability ring

The fleet's guns picked their own targets and fired on their own, so combat
happened whether or not the player did anything - there was nothing to aim and
nothing to decide, and the right half of the screen held nothing at all.
Firing is now an action. VesselWeaponComponent no longer seeks a target; it
shoots along a heading, and the only thing that supplies one is the new
right-hand stick via FireStickController. A fleet arriving from another scene
starts with its guns silent, which is the correct resting state.

A subtle dashed guide runs from the fleet along the aimed heading while the
stick is held, out to the guns' OWN range - read from a weapon that is
actually aboard, so the line can never promise reach the fleet does not have.

Layout: the two sticks take the bottom corners, the pivot pair is centred
between them at the bottom edge, and the laser and gas bomb sit on an arc up
and left of the fire stick where a thumb already is. Those four are now round
- IconButton grew a round_frame mode, and the in-world action controls use it
while panel and menu buttons stay square, so the two kinds of button read as
different kinds of thing.

Worth recording, because it cost a screenshot to find: a script-declared
property set BEFORE the `script = ExtResource(...)` line in a .tscn is
silently dropped. Godot's parser has no idea the property exists yet. The
round frames were all correctly set in both scenes and none of them applied.

Also fixed researtch_lab_garrison.tres, which was authored under the void
profile - that is the black hole surface, so a lab garrison was spawning on
black holes.

Suite 110/110. test_enemy_combat's whole premise was auto-fire; it now holds
the real stick toward the enemy rather than poking weapon components, so it
exercises the path the player uses. test_fire_stick is new and covers the
change itself: an idle stick leaves a target parked well inside range
untouched, which is precisely what the old gun would never have done.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

tests/test_setup_file_identity.gd.uid

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