Function memory game improvements

[jesper-olsen]

Description

1. Performance Optimization: Removed redundant Vec clones in Action::FlipCard. By moving the local cards variable into the new state, we avoid unnecessary allocations.
2. UX Improvement: Updated Action::TrySaveBestScore to return a new state with the updated best_score. Previously, the UI would only reflect a new high score after a game reset, as the reducer only performed a side effect on LocalStorage without updating the in-memory state.

Fixes #0000

Checklist

• [ x] I have reviewed my own code
• I have verified the changes in a browser
• I have added tests

[github-actions]

Size Comparison

Details

examples	master (KB)	pull request (KB)	diff (KB)	diff (%)
async_clock	98.204	98.204	0	0.000%
boids	167.717	167.717	0	0.000%
communication_child_to_parent	91.335	91.335	0	0.000%
communication_grandchild_with_grandparent	102.442	102.442	0	0.000%
communication_grandparent_to_grandchild	98.820	98.820	0	0.000%
communication_parent_to_child	88.695	88.695	0	0.000%
contexts	103.983	103.983	0	0.000%
counter	85.364	85.364	0	0.000%
counter_functional	85.729	85.729	0	0.000%
dyn_create_destroy_apps	88.534	88.534	0	0.000%
file_upload	97.963	97.963	0	0.000%
function_delayed_input	91.248	91.248	0	0.000%
function_memory_game	169.794	169.877	+0.083	+0.049%
function_router	328.655	328.655	0	0.000%
function_todomvc	161.375	161.375	0	0.000%
futures	234.317	234.317	0	0.000%
game_of_life	103.759	103.759	0	0.000%
immutable	245.760	245.760	0	0.000%
inner_html	79.848	79.848	0	0.000%
js_callback	107.756	107.756	0	0.000%
keyed_list	179.063	179.063	0	0.000%
mount_point	83.066	83.066	0	0.000%
nested_list	112.634	112.634	0	0.000%
node_refs	90.708	90.708	0	0.000%
password_strength	1738.812	1738.812	0	0.000%
portals	92.202	92.202	0	0.000%
router	301.765	301.765	0	0.000%
suspense	111.703	111.703	0	0.000%
timer	87.992	87.992	0	0.000%
timer_functional	96.036	96.036	0	0.000%
todomvc	141.359	141.359	0	0.000%
two_apps	85.228	85.228	0	0.000%
web_worker_fib	133.346	133.346	0	0.000%
web_worker_prime	184.949	184.949	0	0.000%
webgl	82.484	82.484	0	0.000%

✅ None of the examples has changed their size significantly.

[Madoshakalaka]

Good improvements, thanks