fix(share-pnl): render brand mark only across all covers

[metodi96]

Summary

Make all three Share-PnL covers render the Nolus brand mark only — covers 2 (orange) and 3 (lavender) were drawing the full mark + "nolus" wordmark, while cover 1 (dark navy) appeared mark-only only because its wordmark color blended into the background. The three previews now look visually consistent.

Changes

• SharePnLDialog.vue: crop the logo SVG to the left 32x32 mark (drawImage(image, 0, 0, 32, 32, 80, 80, 64, 64)) instead of drawing the full 126x32 mark+wordmark
• Drop the now-unused logo: "light" | "dark" field from Palette and all 3 palette entries
• Drop the logoDark import and delete the orphan src/assets/icons/logo-dark.svg
• Rename the remaining import to nolusLogo since the logoLight name no longer reflects what the file is used for

Verification

• vue-tsc --noEmit passed clean
• eslint src/modules/leases/components/single-lease/SharePnLDialog.vue passed clean
• Pre-commit hook ran the full lint + vitest + vite build pipeline successfully
• Visual check expected from the reviewer: open the Share-PnL dialog on a lease and confirm all three thumbnails show only the orange "N" mark in the top-left