fix(frontend): estimate Liquidium ERC20 fees safely

[cursor]

Motivation

Liquidium ETH/EVM supply and repay estimate ERC-20 gas before the SDK returns the final native-address target. The previous pre-confirmation estimate used the sender's own ETH address, which can under-estimate ERC-20 transfer gas when the Liquidium protocol address has no token balance yet. A user with just enough native gas for that under-estimate could confirm a supply/repay transaction that then fails out-of-gas and burns network fees.

Awareness checked: recent/open Liquidium PRs and issues, #13294 repay implementation discussion, #13205/#13292 supply context, the lend/borrow spec, and open Cursor critical-fix drafts. Existing work covers stale Liquidium loads (#13207) and limit-order unit parsing (#13289), but no PR/issue covered Liquidium EVM gas estimation.

Changes

• Add a Liquidium-specific EVM fee-estimation destination that is not the sender address.
• Use that fee-only destination in Liquidium ETH/EVM supply and repay fee contexts while leaving the actual SDK-provided broadcast target unchanged.
• Add focused component regression tests that assert both Liquidium ETH/EVM wizards ask the fee layer to estimate against the Liquidium fee target instead of the sender.

Tests

• npx @sveltejs/mcp svelte-autofixer ./src/frontend/src/lib/components/liquidium/supply/LiquidiumSupplyEthWizard.svelte --svelte-version 5 (no issues; pre-existing suggestions only)
• npx @sveltejs/mcp svelte-autofixer ./src/frontend/src/lib/components/liquidium/repay/LiquidiumRepayEthWizard.svelte --svelte-version 5 (no issues; pre-existing suggestions only)
• PATH="/home/ubuntu/.nvm/versions/node/v24.18.0/bin:$PATH" npx vitest src/frontend/src/tests/lib/components/liquidium/supply/LiquidiumSupplyEthWizard.spec.ts src/frontend/src/tests/lib/components/liquidium/repay/LiquidiumRepayEthWizard.spec.ts (passes: 2 files, 6 tests)
• PATH="/home/ubuntu/.nvm/versions/node/v24.18.0/bin:$PATH" npm run lint:lockfile (passes)
• PATH="/home/ubuntu/.nvm/versions/node/v24.18.0/bin:$PATH" npm run lint -- --max-warnings 0 (blocked by pre-existing Prettier drift in unrelated files such as generated declarations and vitest.config.ts; formatter output was reverted for unrelated files)
• PATH="/home/ubuntu/.nvm/versions/node/v24.18.0/bin:$PATH" npm run check (blocked by existing Solana type error in src/frontend/src/sol/utils/sol-instructions-system.utils.ts:96 for SystemInstruction.CreateAccountAllowPrefund)