studio: unify Windows installer/setup logging style, verbosity controls, and startup messaging (#4651)

* refactor(studio): unify setup terminal output style and add verbose setup mode

* studio(windows): align setup.ps1 banner/steps with setup.sh (ANSI, verbose)

* studio(setup): revert nvcc path reordering to match main

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* studio(setup): restore fail-fast llama.cpp setup flow

* studio(banner): use IPv6 loopback URL when binding :: or ::1

* Fix IPv6 URL bracketing, try_quiet stderr, _step label clamp

- Bracket IPv6 display_host in external_url to produce clickable URLs
- Redirect try_quiet failure log to stderr instead of stdout
- Clamp _step label to column width to prevent negative padding

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Add sandbox integration tests for PR #4494 UX fixes

Simulation harness (tests/simulate_pr4494.py) creates an isolated uv
venv, copies the real source files into it, and runs subprocess tests
for all three fixes with visual before/after demos and edge cases.

Standalone bash test (tests/test_try_quiet.sh) validates try_quiet
stderr redirect across 8 scenarios including broken-version contrast.

39 integration tests total (14 IPv6 + 15 try_quiet + 10 _step), all
existing 75 unit tests still pass.

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Truncate step() labels in setup.sh to match PS1 and Python

The %-15s printf format pads short labels but does not truncate long
ones.  Change to %-15.15s so labels wider than 15 chars are clipped,
matching the PowerShell .Substring(0,15) and Python label[:15] logic.

* Remove sandbox integration tests from PR

These test files are not part of the styling fix and should not
ship with this PR.

* Show error output on failure instead of suppressing it

- install_python_stack.py: restore _red for patch_package_file
  warnings (was downgraded to _dim)
- setup.ps1: capture winget output and show on failure for CUDA,
  Node, Python, and OpenSSL installs (was piped to Out-Null)
- setup.ps1: always show git pull failure warning, not just in
  verbose mode

* Show winget error output for Git and CMake installs on failure

Same capture-and-print-on-failure pattern already used for
Node, Python, CUDA, and OpenSSL winget installs.

* fix: preserve stderr for _run_quiet error messages in setup.sh

The step() helper writes to stdout, but _run_quiet's error header
was originally sent to stderr (>&2). Without the redirect, callers
that separate stdout/stderr would miss the failure headline while
still seeing the log body on stderr. Add >&2 to both step calls
inside _run_quiet to match main's behavior.

* feat: add --verbose flag to setup and update commands

Wire UNSLOTH_VERBOSE=1 through _run_setup_script() so that
'unsloth studio update --verbose' (and the deprecated 'setup')
passes the flag to setup.sh / setup.ps1 / install_python_stack.py.

* fix(studio): honor verbose logging and keep llama.cpp failures non-blocking

* fix(studio): switch installer to 'studio update' and normalize Windows setup logs

* chore(studio): refine localhost tip and remove skip-base setup nois

* fix(studio): align Windows setup logs with Linux style and improve startup tips

* fix(studio): align Windows setup logs with Linux style

* refactor(windows-installer): align install/setup logs with Linux style and silence auto-launch output

* refactor(windows): align installer/setup output with Linux style and reduce default verbosity

* refactor(windows): match install.ps1 output style/colors to setup and quiet default logs

* fix(studio-banner): update personal-computer localhost tip

* fix(setup.sh): restore verbose llama.cpp build output while keeping default quiet mode

* fix(install.sh): align installer logging with setup style and restore POSIX-safe color output

* fix(install.sh): preserve installer reliability and launch visibility

Export verbose mode for child setup processes, harden install command handling under set -e, and keep first-run studio launch non-silent so users can always see URL and port fallback output.

* fix(windows installer): keep exit semantics and degrade status accurate

Use quiet command redirection that preserves native exit codes, keep startup output visible on first launch, and report limited install status when llama.cpp is unavailable.

* fix(setup.sh): improve log clarity and enforce GGUF degraded signaling

Restore clean default setup output, add verbose-only diagnostics, fail fast on Colab dependency install errors, and return non-zero when GGUF prerequisites or llama.cpp artifacts are unavailable.

* fix(installer): harden bash preflight and PowerShell GPU checks

Fail fast when bash is unavailable before invoking setup.sh, and replace remaining nvidia-smi pipeline checks with stream redirection patterns that preserve reliable native exit-code handling.

* fix(windows): keep verbose output visible while preserving exit codes

Ensure PowerShell wrapper helpers in install/update stream native command output to host without returning it as function output, so npm logs no longer corrupt exit-code checks in verbose mode.

* fix(windows): avoid sticky UNSLOTH_VERBOSE and gate studio update verbosity

* Fix degraded llama.cpp exit code, PS verbose stderr, banner URLs, npm verbose

- setup.sh: Do not exit non-zero when llama.cpp is unavailable; the footer
  already reports the limitation, and install.sh runs under set -e so a
  non-zero exit aborts the entire install including PATH/shortcuts/launch.
- setup.ps1: Remove $? check in Invoke-SetupCommand verbose path; PS 5.1
  sets $? = $false when native commands write to stderr even with exit 0.
  Merge stderr into stdout with 2>&1 and rely solely on $LASTEXITCODE.
- startup_banner.py: Show the actual bound address when Studio is bound to
  a non-loopback interface instead of always showing 127.0.0.1/localhost.
- setup.sh: Use run_quiet_no_exit instead of run_quiet_no_exit_always for
  npm install steps so --verbose correctly surfaces npm output.

* Fix install.ps1 verbose stderr, propagate UNSLOTH_VERBOSE, fix git clone verbose

- install.ps1: Apply same Invoke-InstallCommand fix as setup.ps1 -- merge
  stderr into stdout with 2>&1 and drop the $? check that misclassifies
  successful native commands on PS 5.1.
- install.ps1 + setup.ps1: Export UNSLOTH_VERBOSE=1 to the process env
  when --verbose is passed so child processes like install_python_stack.py
  also run in verbose mode.
- setup.sh: Use run_quiet_no_exit for git clone llama.cpp so --verbose
  correctly surfaces clone diagnostics during source-build fallback.

* Surface prebuilt llama.cpp output in verbose mode, remove dead code, fix banner

- setup.sh: Use tee in verbose mode for prebuilt llama.cpp installer so
  users can see download/validation progress while still capturing the log
  for structured error reporting on failure.
- setup.ps1: Same fix for Windows -- use Tee-Object in verbose mode.
- setup.sh: Remove run_quiet_no_exit_always() which has no remaining callers.
- startup_banner.py: Avoid printing the same URL twice when Studio is
  bound to a specific non-loopback address that matches the display host.

* Fix run_install_cmd exit code after failed if-statement

The previous pattern 'if "$@"; then return 0; fi; _rc=$?' always captured
$? = 0 because $? reflects the if-statement result, not the command's exit
code. Switch to '"$@" && return 0; _rc=$?' which preserves the actual
command exit code on failure. Applies to both verbose and quiet branches.

* Fix _run_quiet exit code, double uv install, missing --local flag

- setup.sh: Fix _run_quiet verbose path that always captured exit code 0
  due to $? resetting after if-then-fi with no else. Switch to the same
  '"$@" && return 0; exit_code=$?' pattern used in install.sh.
- setup.sh: Consolidate the two uv install branches (verbose + quiet)
  into a single attempt with conditional output. Previously, when verbose
  mode was on and the install failed, a second silent attempt was made.
- install.ps1: Pass --local flag to 'unsloth studio update' when
  $StudioLocalInstall is true. Without this, studio.py's update() command
  overwrites STUDIO_LOCAL_INSTALL to "0", which could cause issues if
  setup.ps1 or install_python_stack.py later checks that variable.

* Revert SKIP_STUDIO_BASE change for --no-torch, restore install banners

- Revert SKIP_STUDIO_BASE from 0 to 1 for --no-torch. install.sh already
  installs unsloth+unsloth-zoo and no-torch-runtime.txt before calling
  setup.sh, so letting install_python_stack.py redo it was redundant and
  slowed down --no-torch installs for no benefit.
- Restore the "Unsloth Studio installed!" success banner and "starting
  Unsloth Studio..." launch message so users get clear install completion
  feedback before the server starts.

* Make llama.cpp build failure a hard error with proper cleanup

- setup.sh: Restore exit 1 when _LLAMA_CPP_DEGRADED is true. GGUF
  inference requires a working llama.cpp build, so this should be a
  hard failure, not a silent degradation.
- install.sh: Catch setup.sh's non-zero exit with '|| _SETUP_EXIT=$?'
  instead of letting set -e abort immediately. This ensures PATH setup,
  symlinks, and shortcuts still get created so the user can fix the
  build deps and retry with 'unsloth studio update'. After post-install
  steps, propagate the failure with a clear error message.

* Revert install.ps1 to 'studio setup' to preserve SKIP_STUDIO_BASE

'studio update' pops SKIP_STUDIO_BASE from the environment, which
defeats the fast-path version check added in PR #4667. When called
from install.ps1 (which already installed packages), SKIP_STUDIO_BASE=1
must survive into setup.ps1 so it skips the redundant PyPI check and
package reinstallation. 'studio setup' does not modify env vars.

* Remove deprecation message from 'studio setup' command

install.ps1 uses 'studio setup' (not 'studio update') to preserve
SKIP_STUDIO_BASE. The deprecation message was confusing during first
install since the user never typed the command.

* Fix stale env vars, scope degraded exit, generic error message for PR #4651

- install.ps1: Always set STUDIO_LOCAL_INSTALL and clear STUDIO_LOCAL_REPO
  when not using --local, to prevent stale values from a previous --local
  run in the same PowerShell session. Fix log messages to say 'setup' not
  'update' since we call 'studio setup'.
- setup.sh: Only exit non-zero for degraded llama.cpp when called from the
  installer (SKIP_STUDIO_BASE=1). Direct 'unsloth studio update' keeps
  degraded installs successful since Studio is still usable for non-GGUF
  workflows and the footer already reports the limitation.
- install.sh: Make the setup failure error message generic instead of
  GGUF-specific, so unrelated failures (npm, Python deps) do not show
  misleading cmake/git recovery advice.

* Show captured output on failure in quiet mode for PR #4651

Both Invoke-InstallCommand (install.ps1) and Invoke-SetupCommand
(setup.ps1) now capture command output in quiet mode and display it
in red when the command fails. This matches the behavior of
run_install_cmd in install.sh where failure output is surfaced even
in quiet mode, making cross-platform error debugging consistent.

* Match degraded llama.cpp exit on Windows, fix --local recovery hint for PR #4651

- setup.ps1: Exit non-zero for degraded llama.cpp when called from
  install.ps1 (SKIP_STUDIO_BASE=1), matching setup.sh behavior. Direct
  'unsloth studio update' keeps degraded installs successful.
- install.sh: Show 'unsloth studio update --local' in the recovery
  message when the install was run with --local, so users retry with
  the correct flag instead of losing local checkout context.

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Daniel Han <danielhanchen@gmail.com>

studio/install_python_stack.py

@@ -110,7 +110,7 @@ def _stdout_supports_color() -> bool:
     try:
         if not sys.stdout.isatty():
             return False
-    except Exception:
+    except (AttributeError, OSError, ValueError):
         return False
     if IS_WINDOWS:
         try:
@@ -121,7 +121,7 @@ def _stdout_supports_color() -> bool:
             mode = ctypes.c_ulong()
             kernel32.GetConsoleMode(handle, ctypes.byref(mode))
             kernel32.SetConsoleMode(handle, mode.value | 0x0004)
-        except Exception:
+        except (ImportError, AttributeError, OSError):
             return False
     return True
 
@@ -460,7 +460,7 @@ def install_python_stack() -> int:
 
     # 3. Core packages: unsloth-zoo + unsloth (or custom package name)
     if skip_base:
-        print(_green(f"✅ {package_name} already installed — skipping base packages"))
+        pass
     elif NO_TORCH:
         # No-torch update path: install unsloth + unsloth-zoo with --no-deps
         # (current PyPI metadata still declares torch as a hard dep), then