Hide Safari default input outline

[sheff146]

Fixes issue #2376 where ugly default outline appeared on focused input in Safari.
Before:

After:

[DustyTheBot]

	Warnings
⚠️	There are no updates provided to CHANGELOG. Ensure there are no publicly visible changes introduced by this PR.

Perf comparison

Status	Scenario	Fluent TPI	Fabric TPI	Ratio	Iterations	Ticks
🔧	Avatar.Fluent	0.44	0.39	1.13:1	2000	878
🦄	Button.Fluent	0.1	0.18	0.56:1	1000	103
🔧	Checkbox.Fluent	0.73	0.3	2.43:1	1000	727
🔧	Dialog.Fluent	0.3	0.16	1.88:1	5000	1491
🔧	Dropdown.Fluent	3.06	0.38	8.05:1	1000	3055
🔧	Icon.Fluent	0.12	0.03	4:1	5000	600
🦄	Image.Fluent	0.05	0.08	0.63:1	5000	231
🔧	Slider.Fluent	1.35	0.29	4.66:1	1000	1347
🔧	Text.Fluent	0.05	0.02	2.5:1	5000	259
🦄	Tooltip.Fluent	0.11	18.15	0.01:1	5000	555

🔧 Needs work     🎯 On target     🦄 Amazing

Perf tests with no regressions

Scenario	Current PR Ticks	Baseline Ticks	Ratio
FormMinimalPerf.default	910	683	1.33:1
FlexMinimalPerf.default	503	396	1.27:1
Tooltip.Fluent	555	450	1.23:1
ChatMinimalPerf.default	486	409	1.19:1
AnimationMinimalPerf.default	535	459	1.17:1
ProviderMinimalPerf.default	680	587	1.16:1
LabelMinimalPerf.default	892	790	1.13:1
ReactionMinimalPerf.default	2592	2344	1.11:1
StatusMinimalPerf.default	249	225	1.11:1
ListMinimalPerf.default	322	294	1.1:1
ButtonSlotsPerf.default	608	561	1.08:1
SplitButtonMinimalPerf.default	12369	11500	1.08:1
Image.Fluent	231	214	1.08:1
AvatarMinimalPerf.default	504	471	1.07:1
HeaderMinimalPerf.default	455	426	1.07:1
GridMinimalPerf.default	853	803	1.06:1
PopupMinimalPerf.default	353	333	1.06:1
PortalMinimalPerf.default	232	219	1.06:1
SliderMinimalPerf.default	1392	1312	1.06:1
HierarchicalTreeMinimalPerf.default	797	757	1.05:1
ListCommonPerf.default	920	877	1.05:1
TableMinimalPerf.default	561	535	1.05:1
Icon.Fluent	600	569	1.05:1
HeaderSlotsPerf.default	1262	1212	1.04:1
TreeWith60ListItems.default	220	212	1.04:1
EmbedMinimalPerf.default	5909	5747	1.03:1
Slider.Fluent	1347	1312	1.03:1
Text.Fluent	259	252	1.03:1
DialogMinimalPerf.default	1561	1527	1.02:1
InputMinimalPerf.default	913	897	1.02:1
MenuButtonMinimalPerf.default	1456	1423	1.02:1
TooltipMinimalPerf.default	688	674	1.02:1
ImageMinimalPerf.default	234	232	1.01:1
ListWith60ListItems.default	152	151	1.01:1
SegmentMinimalPerf.default	1141	1126	1.01:1
DividerMinimalPerf.default	847	846	1:1
ItemLayoutMinimalPerf.default	1654	1652	1:1
MenuMinimalPerf.default	1861	1857	1:1
CustomToolbarPrototype.default	3358	3359	1:1
ToolbarMinimalPerf.default	786	783	1:1
AttachmentMinimalPerf.default	821	827	0.99:1
AttachmentSlotsPerf.default	3020	3044	0.99:1
TextAreaMinimalPerf.default	2831	2859	0.99:1
Checkbox.Fluent	727	736	0.99:1
Dialog.Fluent	1491	1504	0.99:1
ChatWithPopoverPerf.default	509	520	0.98:1
CheckboxMinimalPerf.default	3454	3518	0.98:1
RefMinimalPerf.default	149	152	0.98:1
TextMinimalPerf.default	264	270	0.98:1
TreeMinimalPerf.default	813	831	0.98:1
VideoMinimalPerf.default	655	666	0.98:1
Avatar.Fluent	878	896	0.98:1
BoxMinimalPerf.default	233	239	0.97:1
DropdownMinimalPerf.default	3258	3349	0.97:1
IconMinimalPerf.default	292	300	0.97:1
LoaderMinimalPerf.default	763	786	0.97:1
AccordionMinimalPerf.default	209	217	0.96:1
ChatDuplicateMessagesPerf.default	371	387	0.96:1
LayoutMinimalPerf.default	604	628	0.96:1
ProviderMergeThemesPerf.default	1072	1118	0.96:1
Dropdown.Fluent	3055	3178	0.96:1
ListNestedPerf.default	645	687	0.94:1
DropdownManyItemsPerf.default	412	442	0.93:1
RadioGroupMinimalPerf.default	407	438	0.93:1
ButtonMinimalPerf.default	119	130	0.92:1
CarouselMinimalPerf.default	1815	1993	0.91:1
Button.Fluent	103	113	0.91:1
AlertMinimalPerf.default	625	700	0.89:1

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