feat: Refactor Logger for Pretty, Consistent CLI Output

[drlucaa]

The current logger adapter uses log/slog's default text handler, which outputs structured key-value pairs (e.g., level=INFO msg="..."). This style conflicts with the polished, human-readable output generated by the linear renderer used during same run.

We need to refactor the logger to produce visually consistent, "pretty" output for standalone commands like clean and version. The new implementation should strip away structured logging artifacts (timestamps, levels, keys) in favor of styled, direct text that respects the user's terminal environment.

Goals

• Visual Consistency: Ensure all CLI output shares the same aesthetic (colors, spacing, typography) as the build execution logs.
• Shared Design System: Centralize color and icon definitions to prevent visual drift between the TUI, linear renderer, and logger.
• TTY Awareness: Strictly respect NO_COLOR and terminal capabilities.

Acceptance Criteria

1. Style & Formatting

• Info Logs:
  • Icon: None. (Text only).
  • Color: Default/Slate (Neutral).
  • Format: <Message> (No timestamp, no level= key).
• Warn Logs:
  • Icon: ! (or similar warning symbol).
  • Color: Yellow.
  • Format: <Icon> <Message>.
• Error Logs:
  • Icon: ✗ (Cross mark).
  • Color: Red.
  • Format: <Icon> <Message>.
• Prefixes: The output must NOT include tool prefixes (e.g., remove [same], [cli]).

2. Implementation

• Shared Package: Extract colors (colorIris, colorRed, etc.) and icons from internal/adapters/tui/styles.go into a new shared package (e.g., internal/ui/style) usable by all adapters.
• Logger Adapter: Refactor internal/adapters/logger to remove slog.NewTextHandler. Implement a custom handler (or wrapper) using github.com/muesli/termenv to render styled text directly to os.Stderr.
• Environment: The logger must detect TTY capabilities and respect the NO_COLOR environment variable (stripping ANSI codes if set).

3. Verification

• Running same clean produces output similar to:

  Removing build info store...
  removed build info store
  

  (Note: No icons for these info logs, no level= keys).