Revamp terminal aesthetics for tern-cli and tern-dev to Oxide style

[Prateek32177]

Motivation

• Provide a unified, left-aligned Oxide-style terminal aesthetic across both @hookflo/tern-cli and @hookflo/tern-dev using a shared emerald/cyan/yellow/muted palette.
• Replace mixed/centered/clack default output with consistent bordered rows, breathing room, and brand-colored accents while preserving existing runtime behavior.
• Keep all forwarding, config, and handler functionality unchanged while moving presentation to custom print helpers.

Description

• Updated ANSI palette to the requested colors by changing packages/tern-cli/src/colors.ts and src/logger.ts to include GREEN, CYAN, YELLOW, GRAY, MUTED, WHITE, RED, RESET, and BOLD constants.
• Rebuilt CLI print layer in packages/tern-cli/src/print.ts with new primitives and helpers (printLogo, printDivider, printRow, printPipe, printSummary, printStep, printStepDone, printStepFile, printEnvBlock, startConnectingAnimation, printUrlBox, printListeningState, printEvent, printExit) to implement the new layout and animated connecting bar.
• Switched @hookflo/tern-cli flows to use the new print helpers by updating packages/tern-cli/src/index.ts, packages/tern-cli/src/install.ts, packages/tern-cli/src/tunnel.ts, packages/tern-cli/src/files.ts, and packages/tern-cli/src/config.ts; this includes replacing the clack spinner with printStep/printStepDone outputs and making createHandlerFile return a boolean so callers control printed output.
• Reworked tern-dev logging in src/logger.ts to the same aesthetic primitives (banner, rows, dividers, connected/reconnecting/safety/request/session-ended functions) and wired the runtime in src/cli.ts to call printConnected, printReconnecting, printRequest, and printSessionEnded instead of the old helpers so logs match the new format.

Testing

• Ran TypeScript checks via npm run typecheck at the repo root and the command completed successfully.
• Ran npm run typecheck inside packages/tern-cli and the command completed successfully.

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