refactor: improve useVisitorData mount fetch and request-source handling

[erayaydin]

• Folded #201 into this branch; ESLint upgrade work lives there
• Refactor useVisitorData to track getVisitorData in config state, re-enter loading when the request source changes, and fetch on mount without a react-hooks/set-state-in-effect disable
• Add coverage for the request-source loading transition

Discussion point: mount fetch path

Mount now calls currentGetVisitorData directly instead of going through getData(). That avoids the synchronous setState-in-effect lint, but means mount success/error handling is duplicated with getData. Prefer this, or a shared helper?

Note: merge order

Land #201 first; this PR is the follow-up called out in that merge plan.

[github-actions]

Coverage report

St.❔	Category	Percentage	Covered / Total
🟢	Statements	82.64% (-0.32% 🔻)	119/144
🟡	Branches	71.08% (+2.66% 🔼)	59/83
🟢	Functions	81.82% (+0.87% 🔼)	36/44
🟢	Lines	82.01% (-0.29% 🔻)	114/139

Show files with reduced coverage 🔻

St.❔	File	Statements	Branches	Functions	Lines
🟢	use-visitor-data.ts	90.63% (-5.03% 🔻)	100%	85.71% (+5.71% 🔼)	90.63% (-5.03% 🔻)

Test suite run success

23 tests passing in 15 suites.

Report generated by 🧪jest coverage report action from 8b73326

Show full coverage report

St	File	% Stmts	% Branch	% Funcs	% Lines	Uncovered Line #s
🟢	All files	82.63	71.08	81.81	82.01
🟢	src	87.32	80.55	85	86.95
🟢	detect-env.ts	90	83.33	100	90	15,87
🟢	env.ts	100	100	100	100
🟢	env.types.ts	85.71	40	50	83.33	14
🟡	...nt-context.ts	75	100	0	75	8
🟡	get-env.ts	60	0	100	60	8-9
🟢	ssr.ts	100	100	100	100
🟢	...sitor-data.ts	90.62	100	85.71	90.62	111-119
🟢	src/components	91.66	58.33	91.66	91.17
🟢	...-provider.tsx	90.32	54.54	90.9	89.65	47,52,85
🟢	...vironment.tsx	100	100	100	100
🟡	src/utils	64.86	69.56	66.66	63.88
🟡	...is-defined.ts	50	75	100	50	3
🟡	to-error.ts	66.66	50	100	66.66	6
🟢	...mise-store.ts	91.3	92.3	100	90.9	20,26
🔴	wait-until.ts	0	0	0	0	8-19

[erayaydin]

Moving the PR to draft since we're planning to upgrade @fingerprintjs/eslint-config-dx-team to ^3.0.0 instead of ^2.0.0.

[github-actions]

⚠️ This PR doesn't contain any changesets. If there are user-facing changes, don't forget to run:

pnpm exec changeset

to create a changeset.