refactor: enforce TypeScript strict mode and eliminate all any types

[shivv23]

Enables TypeScript strict mode and eliminates all implicit and explicit any types across the codebase.

Changes

tsconfig.json - "strict": false to "strict": true

Type declarations (new src/types/ directory):

• socialcalc.d.ts - typed declarations for the vendored SocialCalc JS module
• meshkit-ionic.d.ts - typed declarations for @meshkit/ionic (local file dependency)

src/vite-env.d.ts - added VITE_PINATA_JWT to ImportMetaEnv

src/components/Storage/LocalStorage.ts - added FileData and FileListItem interfaces; typed _getFile and _getAllFiles return types; added null guard on Preferences.get()

src/services/MeshkitService.ts - typed function params and return types

src/components/Dashboard/Dashboard.tsx - typed state with FileListItem, guarded optional cid access, cast device type for DATA index

src/components/Menu/Menu.tsx - created MenuProps interface; typed all callback params; made doSave async; null-guarded window.open()

src/components/Files/Files.tsx - created FilesProps interface; typed state, callbacks, and null-guarded cid access

src/components/NewFile/NewFile.tsx - created NewFileProps interface; typed callback params; cast device type for DATA index

src/pages/Home.tsx - narrowed device state to "default" literal; typed activateFooter param

src/pages/MeshKit.tsx - replaced useState<any> with useState<Record<string, unknown> | null>; added explicit generic to retrieveJSON

Verification

npx tsc --noEmit passes with zero errors.