vyai: vanhemmat versiot ja versiohistoria

chore(deps): bump golang.org/x/crypto from 0.51.0 to 0.52.0
chore(deps): bump google.golang.org/grpc from 1.79.3 to 1.83.2
chore: add license
chore: remove unused dependencies and adjust message spacing
feat(config): upgrade legacy default prompts
feat(gemini): implement asynchronous conversation title generation
fix: accumulate and stream token deltas correctly
fix: bump vulnerable Go dependencies
refactor(ui): optimize stream rendering and improve viewport layout

feat(ui): card-style explore page with custom list delegate
feat(ui): custom explore list delegate with theme styling
feat(ui): settings tab custom controls with model cycling
feat(ui): styled chat messages with user/assistant labels
feat: stream Gemini responses incrementally
fix(ui): improve viewport height calculation and loading view alignment
fix: dynamic viewport height accounting for notice
fix: move notice above viewport to prevent input/footer shift
fix: stabilize layout height during loading state
fix: validate GOOGLE_API_KEY at startup, nil-guard response handling
refactor(gemini): remove logger from service
refactor(ui): replace settings list.Model with custom rendered view