… locale files

The fila_manager web page was hardcoded in Chinese (lang="zh") with no
internationalization support. This commit adds a lightweight i18n system:

- Add locales/en.json and locales/zh_CN.json with all UI strings
- Add t(key) / tf(key, n) translation helpers loaded at startup
- Apply translations via data-i18n / data-i18n-placeholder attributes in HTML
- Replace all hardcoded Chinese strings in index.js with t() calls
- Language is resolved from the ?lang= URL parameter passed by C++

… strings

Two printer status strings shown during calibration used the misspelling
"percision" instead of "precision". Also fix lang="zh-CN" in
NozzleListTable.html (the table content is set by C++ at runtime).

All .po and .pot msgid entries updated to match the corrected source strings.

- 'Problem occured' → 'Problem occurred' (MediaPlayCtrl.cpp)
- 'When enable spiral vase mode' → 'When enabling ...' (SelectMachine.cpp, SyncAmsInfoDialog.cpp)
- 'connectors is out of object' → 'connectors are out of object' (GLGizmoAdvancedCut.cpp)
- 'Error:Detecting ...' → 'Error: Detecting ...' with spacing fixes (GLGizmoText.cpp)

Update all corresponding msgid entries in BambuStudio.pot and all 18 .po locale files.

Fix missing spaces after 'Warning:', 'Error:', and 'Tip:' prefixes,
missing spaces after sentence-ending periods and commas, and several
grammar issues in strings that appear to originate from machine
translation:

- GLGizmoText.cpp: fix 9 Warning: strings (space + grammar)
  - 'Warning:create text fail.' → 'Warning: Text creation failed.'
  - 'Warning:text normal is error.' → 'Warning: Text normal has an error.'
  - 'Warning:Due to font upgrades,previous...' → proper spacing
  - 'reedit it will ok' → 'reedit it to fix the issue'
  - 'dragging text' → 'drag the text' (imperative form)
- GLGizmoMeasure.cpp: fix 3 Warning: strings + 'two different mesh' → 'meshes'
- GLGizmoSVG.cpp: fix 'Tip:If...' + missing comma + 'svg file' → 'SVG file'
- PlaterWorker.hpp: 'error occured' → 'error occurred'
- DeviceManager.cpp: missing spaces after period/comma + '(PLA...)' spacing
- BindDialog.cpp: 'device.Before', 'termsand', 'Use(collectively)' spacing
- ConfigManipulation.cpp: missing spaces after comma and period
- AMSSetting.cpp: missing space after '1 minute.'
- Preferences.cpp: 'tab.If change value' → 'tab. If you change this value'

Update all msgid entries in BambuStudio.pot and all 18 .po locale files.

- AuxiliaryDialog.cpp: 'Auxiliaryies' → 'Auxiliaries' (dialog title)
- FanControl.cpp: 'print qulity' → 'print quality'
- GLGizmoFlatten.cpp: 'too small,The' → 'too small. The' (comma → period)
- Monitor.cpp: 'Assistant(HMS)' → 'Assistant (HMS)' (space before parenthesis)
- AMSSetting.cpp: 'during  printing' → 'during printing' (double space)
- AMSDryControl.cpp + uiAmsHumidityPopup.cpp: 'Left Time' → 'Remaining Time'
- Plater.cpp: 'attrited' → 'worn' (non-standard word)

Update all corresponding msgid entries in BambuStudio.pot and all 18 .po
locale files.

On macOS, BambuStudio already auto-follows the system dark/light theme
via EVT_SYS_COLOUR_CHANGED. On Windows this handler was guarded with
#ifndef __WINDOWS__, so theme changes were silently ignored.

Changes:
- GUI_Utils.hpp: EVT_SYS_COLOUR_CHANGED now fires on Windows when
  'dark_mode_follow_system' is enabled; calls update_dark_config() and
  on_sys_color_changed() to refresh the UI
- GUI_App.cpp dark_mode(): if follow-system is enabled, query
  check_dark_mode() (system appearance) instead of the stored config;
  on startup, sync dark_color_mode config from system if follow-system
  is enabled
- MainFrame.cpp on_sys_color_changed(): call force_colors_update() and
  update_ui_from_settings() on all platforms (previously skipped on
  Windows), so a system-triggered theme change gets a full UI refresh
- Preferences.hpp/.cpp: add 'Follow system theme' checkbox below the
  manual 'Enable dark mode' toggle; when checked the manual toggle is
  disabled and the current system state is applied immediately

Resolves feature request bambulab#10800.

- F1–F4 switch between the four main tabs (3D Editor, Preview, Monitor,
  Project); F5 triggers reslice when a model is loaded
- ColorPickerPopup gains a hex input field (#RRGGBB) below the custom
  color swatch; typing a valid 6-digit hex and pressing Enter applies
  the color and fires EVT_SELECTED_COLOR; clicking any swatch updates
  the hex field to match the selected color

- update_title() now sets the topbar label to "Bambu Studio <version>"
  on Windows/Linux so the version is always visible without opening
  the About dialog (closes bambulab#10642)
- Preferences > Online Models gains a "Open full MakerWorld site"
  checkbox (config key makerworld_use_full_site); when enabled the
  Online Models tab loads the unrestricted makerworld.com pages
  instead of the /studio/webview simplified view, restoring access to
  comments, account management, and other features (closes bambulab#10801)

- update_title() now shows the open project filename and a leading '*'
  when there are unsaved changes, keeping the topbar in sync via the
  existing wxEVT_IDLE handler; title reverts to the app name + version
  when no project is open (closes bambulab#9987, closes bambulab#9989)
- Cloud connection failure dialog now uses RichMessageDialog with a
  "Don't show this warning again" checkbox; checking it sets config key
  suppress_cloud_warnings=1 so the dialog is permanently suppressed
  for offline/LAN-only workflows (closes bambulab#10589)

- Preferences > General Settings: "Auto-save project every 5 minutes"
  checkbox (config key autosave_enabled); a wxTimer in MainFrame fires
  every 5 min and calls save_project() silently when the project has a
  filename, is dirty, and the option is enabled (closes bambulab#10334)
- Alt+Arrow moves selected objects by 0.1 mm; Alt+Shift+Arrow by
  0.01 mm; existing Shift+Arrow (1 mm) and plain Arrow (10 mm) are
  unchanged; added to the keyboard shortcuts dialog (closes bambulab#10194)
- LayerRangeEditor now explicitly sets background/foreground to the
  app's dark-mode palette colours after UpdateDarkUI(), fixing the
  unreadable contrast in the Height Range Modifier field on Linux dark
  mode (closes bambulab#10685)

Adds a "Pause in Xh Ym" label below the layer counter in the printing
task panel whenever a scheduled PausePrint exists ahead of the current
layer. The countdown is derived from the locally sliced gcode (layer
Z-heights + custom gcode entries) and the printer's reported remaining
time, updated on every status tick.

Closes bambulab#10632
Closes bambulab#10562