v0.7.3-rc: 🔍 feat: Show Messages from Search Result (#2699)

* refactor(Nav): delegate Search-specific variables/hooks to SearchContext

* fix: safely determine firstTodayConvoId if convo is undefined

* chore: remove empty line

* feat: initial render of search messages

* feat: SearchButtons

* update Ko.ts

* update localizations with new key phrases

* chore: localization comparisons

* fix: clear conversation state on searchQuery navigation

* style: search messages view styling

* refactor(Convo): consolidate logic to navigateWithLastTools from useNavigateToConvo

* fix(SearchButtons): styling and correct navigation logic

* fix(SearchBar): invalidate all message queries and invoke `clearText` if onChange value is empty

* refactor(NewChat): consolidate new chat button logic to NewChatButtonIcon

* chore: localizations for Nav date groups

* chore: update comparisons

* fix: early return from sendRequest to avoid quick searchQuery reset

* style: Link Icon

* chore: bump tiktoken, use o200k_base for gpt-4o