Fix variable settings pagination

[HarshMN2345]

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Greptile Summary

This PR introduces backend-driven pagination for environment variables in function and site settings pages. Instead of navigating to a new URL on each page turn, the component now fetches the requested page directly via a new sdkListVariables prop, keeping the user on the current route.

• updateVariables.svelte: adds pagedVariableList local state and reloadPageOnPagination prop; page-change handler fetches via sdkListVariables when reloadPageOnPagination=false; CRUD operations continue to call invalidate(Dependencies.VARIABLES) through the parent sdk*Variable functions, which correctly resets pagedVariableList to page 1.
• +page.ts (functions & sites): initialises the variables query with PAGE_LIMIT=12 and offset=0, returning limit and variablesOffset to the page for prop binding.
• +page.svelte (functions & sites): wires the new sdkListVariables, backendPagination, reloadPageOnPagination={false}, variablesOffset, and variablesLimit props to UpdateVariables.

Confidence Score: 5/5

Safe to merge; the pagination logic is correct and CRUD operations properly reset back to page 1 via the existing invalidation flow.

All changed code paths behave correctly: CRUD operations invalidate and reset state as expected, pagedVariableList is initialised and updated consistently, and the reloadPageOnPagination=false branch fetches the right page. The only findings are a redundant initial re-fetch in loadAllVariables and two orphaned module-level constants — neither affects correctness or user-visible behaviour.

No files require special attention.

Important Files Changed

Filename	Overview
src/routes/(console)/project-[region]-[project]/updateVariables.svelte	Core change: adds pagedVariableList state and reloadPageOnPagination prop so page changes fetch directly via sdkListVariables instead of navigating; CRUD invalidation correctly resets to page 1; loadAllVariables unnecessarily re-fetches page 1 data when backendPagination=true.
src/routes/(console)/project-[region]-[project]/functions/function-[function]/settings/+page.svelte	Wires up sdkListVariables, backendPagination, reloadPageOnPagination=false, variablesOffset, and variablesLimit props to the UpdateVariables component correctly.
src/routes/(console)/project-[region]-[project]/functions/function-[function]/settings/+page.ts	Adds PAGE_LIMIT/offset=0 for function variables and a VARIABLES_LIMIT=100 constant for global variables; the module-level constant is used only once inline and diverges from PAGE_LIMIT without explanation.
src/routes/(console)/project-[region]-[project]/sites/site-[site]/settings/+page.svelte	Mirror of the functions settings page change; correctly wires all new props to UpdateVariables.
src/routes/(console)/project-[region]-[project]/sites/site-[site]/settings/+page.ts	Same pattern as the functions loader; carries the same unexplained VARIABLES_LIMIT=100 constant used only once.

_{Reviews (3): Last reviewed commit: "Merge main into variable pagination bran..." | Re-trigger Greptile}