Fix all build-breaking ESLint errors, type errors, and lint warnings #4682

Originally written by @Copilot on GitHub.
Imported from https://github.com/ccantynz-alt/Dominat8.com/pull/20

What changed?

• Small fix

next build failed with 3 ESLint errors, 4 ESLint warnings, and several downstream type errors uncovered once linting passed.

ESLint errors (build-breaking):

• D8TV.tsx — stray type annotations in function body (tone?: string; etc.)
• route.ts — try: any { → try {
• kv.ts — eslint-disable referencing nonexistent @typescript-eslint/no-var-requires rule

ESLint warnings:

• gallery/page.jsx — <img> → <Image /> from next/image
• marketing-queue/page.tsx — suppressed intentional useEffect dep omission
• projects/page.tsx — removed "use client" from async component (no hooks used)
• ProjectTerminal.tsx — wrapped steps in useMemo to stabilize dep array

Type errors (surfaced after lint fix):

• (marketing)/_d8/D8Bits.tsx — D8Card props missing title/body/kicker (all 4 callers pass them)
• d8kv.ts — added missing projectVideoKey export
• VideoStudioClient.tsx — canvas ctx null-narrowing lost in closure; assigned to const context post-guard
• page.tsx — removed intentional AutoRepairDemoWidget demo breakage import
• marketing-queue/page.tsx — typed headers useMemo return as Record<string, string>
• tsconfig.json — excluded _archive/** (stale backup files with broken imports)

Quality gates (must be green)

• CI build is green
• No unexpected UI/design changes on Dominat8.com
• If protected paths changed: override label OR ALLOW_PROTECTED_PATHS file added with reason

Notes / risks

• The _archive directory contained stale .ts files with broken imports; previously masked by ESLint failing first. Excluded via tsconfig.json rather than deleting content.
• projectVideoKey key format (projectVideo:${projectId}) inferred from naming convention of sibling key helpers—verify against any existing KV data.
• D8Card in (marketing)/_d8/D8Bits.tsx was updated to match the full implementation already in src/app/_d8/D8Bits.tsx.

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