Fix multiple issues: PETG-HF type, Chinese comments, Klipper wizard, spiral lift, color matching, prime tower, filament preprocessing, by-object print, filament density, calibration models, login persistence, filament selections

[kbaker827]

Summary

This PR fixes 15 separate issues:

Fix #96 — PETG-HF filament type not recognized

• Added `"filament_type": ["PETG-HF"]` to `Bambu PETG HF @base.json`
• Added `"PETG-HF"` to the `filament_types` whitelist in `CreatePresetsDialog.cpp`

Fix #138 — Chinese comments in Print.cpp

• Translated 7 Chinese-language comments in `src/libslic3r/Print.cpp` to English

Fix #179 — Generic Klipper / 3rd-party printers cannot be selected in ConfigWizard

• Root cause: `Pages3rdparty pages_3rdparty` was commented out; vendor pages were never added to the navigation index
• Restored the `pages_3rdparty` field and vendor page iteration in `load_pages()`

Fix #161 — Spiral lifting 3.5mm boundary warning / unusable bed area

• `GCodeWriter` now stores the bed bbox and checks each spiral lift arc against it
• Falls back to lazy lift automatically when the arc would exceed bed extents

Fix #172 — Smart Color Matching (duplicate/near-identical filament slots on import)

• `deal_approximate_match_btn()` accepts a DeltaE76 threshold parameter
• `deal_add_unmatched_filaments()` only adds slots for colors that exceed threshold
• `deal_default_strategy()`: reset → match with threshold → add only unmatched

Fix #121 — Prime tower "Fillet wall" causes x-axis out-of-range error

• `WipeTower2` now clamps cone arc radius to stay within the bed boundary
• Extended to all bed shapes: circular beds use a distance-from-center check; rectangular/custom use bounding-box margins

Fix #135 — Prime tower placed outside build plate on multi-plate projects

• `set_default_wipe_tower_pos_for_plate()` reads `printable_area` instead of hard-coding `y=250`

Fix #115 — Filament not showing in Print Preprocessing window

• `load_selections()` / `update_selections()`: only replace filament presets that no longer exist (not merely invisible/incompatible)
• `reset_and_sync_ams_list()`: replaced O(n²) linear scan with `find_preset()` (visibility-agnostic) for correct index alignment

Fix #136 — By-object print causes toolhead collision

• Inter-object travel reordered: `retract` → `travel_to_z(m_max_layer_z)` → `set_extruder` → `travel_to(origin)`

Fix #103 #114 — Filament density 0 → zero weight and U1 filament rejection

• `Snapmaker PLA SnapSpeed.json`: density corrected from `"0"` to `"1.25"`
• `fdm_filament_common.json`: density corrected from `"0"` to `"1.24"`

Fix #159 — Calibration models non-manifold/unsliceable on macOS and Linux

• `calib_temp`: upper and lower cuts now use `-EPSILON` (was `+EPSILON`) to cut just below each flat block face, avoiding degenerate geometry
• `calib_max_vol_speed`, `calib_retraction`, `calib_VFA`: cut heights now subtract `EPSILON`

Fix #116 — Snapmaker login credentials not persisted on macOS/Linux

• Root cause: `SMUserInfo` is a plain in-memory struct with no serialization. WebKit (macOS/Linux) does not preserve session cookies, so the token is lost when the app closes.
• `WebSMUserLoginDialog`: saves `sm_user_token` / `sm_user_name` / `sm_user_icon_url` to `AppConfig` after login
• `GUI_App::init_app_config()`: restores login state from AppConfig on startup
• `GUI_App::sm_request_user_logout()`: clears all three keys from AppConfig on logout

Fix #164 — Linux Flatpak crashes: "Cannot register URI scheme wxfs more than once"

• Root cause: `WebView::CreateWebView()` called `RegisterHandler("wxfs")` and `RegisterHandler("memory")` on every invocation. WebKitGTK registers URI schemes globally per process, so the second call is a fatal abort.
• Added a `static bool s_handlers_registered` guard in the non-Windows branch of `CreateWebView()` so both handlers are registered exactly once per process lifetime.

Fix #101 — Filament selections not saved after Add/Remove Filaments wizard

• Root cause: `ConfigWizard::priv::apply_config()` sets filament selections in `AppConfig` in memory but never calls `app_config->save()`. If the app exits before the next periodic dirty-save fires, the changes are lost.
• Added `app_config->save()` at the end of `apply_config()` after `export_selections()`

Test plan

• Verify PETG-HF filament is correctly identified in filament presets
• Verify "Generic Klipper Printer" appears and is selectable in ConfigWizard
• Verify spiral lift near bed edges: enable spiral lift, slice near a corner — confirm slicing succeeds without warnings (inspect G-code to confirm G2/G3 arc or fallback straight lift; no error dialog)
• Import multi-color file with near-identical colors — verify they map to existing slots (no new duplicate slots added)
• Import multi-color file with distinct colors — verify new slots are created
• Slice with Snapmaker A250 profile (cone_angle=40°) — verify no out-of-range movements (inspect G-code or confirm no error dialog)
• Add a second plate — verify prime tower appears within bed boundary
• Open System Filaments dialog, uncheck a filament, verify it still shows in Print Preprocessing window (not replaced by a fallback)
• Slice by-object print with IDEX profile — inspect G-code: retract must appear before the Z-lift, and Z-lift before the T-command toolchange
• Select "Snapmaker PLA SnapSpeed", slice any model — verify non-zero weight displayed
• On macOS or Linux: generate each calibration tool (Temp Tower, Retraction, Max Flow, VFA) and verify no non-manifold error
• Log in to Snapmaker account, close and reopen OrcaSlicer — verify login state is restored without re-authenticating
• Log out — verify login state is NOT restored on next launch
• On Linux Flatpak: open multiple panels/tabs that each create a WebView — verify no crash or "Cannot register URI scheme" error
• Open Add/Remove Filaments wizard, select filaments, click Confirm — close and reopen OrcaSlicer — verify selections are preserved

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