Fix scripting terminal editor bugs (scroll, cursor, focus, sync)

[rubensworks]

Phase 1 of the scripting terminal UX improvements, and the base of a stack: #77 ← #78 ← #79 ← #80 ← #81 ← #82. Each commit fixes one problem.

Each problem below was first reproduced on master-1.21-lts in a dev client driven by clientdevbridge, then checked again with this branch.

Commit	Problem on master	Result with this PR
Don't reset the editor scroll position on every edit	Scrolled to row 10, typed one character: the view jumped to row 0 while the scrollbar stayed in the middle.	View stays at row 10. Deleting the whole script while scrolled to the bottom doesn't crash (the #52 scenario).
Keep the cursor visible in the editor	Pressing Enter on the last visible line moved the cursor off-screen; it was hidden and the view didn't follow.	View scrolls with the cursor.
Don't lose editor focus on unhandled keys	Tab, then E, closed the terminal: unhandled keys unfocused the editor.	Terminal stays open and typing continues.
Keep trailing newlines when syncing scripts	String.split dropped trailing empty lines when syncing.	New unit test; it fails on master ("a\n\n" became "a") and passes here.
Start editor line numbers at 1	The gutter starts at 0, while GraalJS errors count from 1 (an error on the second line is reported as script0.js:2:6).	Gutter starts at 1.
Don't wrap editor text below the scrollbar	Long wrapped lines were drawn underneath the scrollbar.	Wrapping stops before the scrollbar.
Make page up and page down move through the editor	Both keys were consumed but did nothing.	Cursor and view move by one page.
Keep the open script when the scripting terminal is resized	Data loss. After resizing the window or changing the GUI scale, the editor was empty, and the next keystroke replaced the whole script with that character (a 40-line file became z).	After resizing, the script and cursor are restored, and typing edits the real content.
Use the macOS keys for moving by word and line in the script editor	On macOS, Cmd+Left/Right jumped by word, and Option+Left/Right only moved one character, unlike native macOS text fields.	On macOS: Option+Left/Right and Option+Backspace/Delete work by word, Cmd+Left/Right go to the line start/end, Cmd+Up/Down to the script start/end. Other platforms keep Ctrl. Covered by unit tests for both platforms; checked in-game on Linux that Ctrl+Left/Right and Ctrl+Backspace still work. I could not run the macOS path in-game, since the dev client runs on Linux.
Don't draw the selection over the bottom border of the script editor	The editor has room for part of a 13th row. A selection continuing below the last visible line drew that hidden row's highlight over the bottom border.	The highlight stops at the last visible line.
Don't block dragging items over slots in the scripting terminal	The editor claimed every mouse drag, so dragging a held stack over inventory slots put the whole stack in one slot (in a chest, the same drag spreads it).	The stack is spread over the slots, and dragging in the editor still selects text.
Don't put the cursor on the hidden row below the script editor's last line	Clicking the strip below the last visible line put the cursor on the hidden 13th line, drawn over the bottom border.	Such clicks go to the last visible line.

About the focus fix

Since WidgetTextArea extends EditBox (bfe27b7, #40), EditBox.charTyped consumes every character into its own unused value while the widget is focused. Typing only worked because each key press unfocused the widget right before its character arrived. This PR keeps focus, so it also stops delegating charTyped to EditBox. I checked that normal typing still works with real key press and character events.

Testing

• ./gradlew build passes, including the new unit tests.
• ./gradlew runGameTestServer: all 22 tests pass.

Not fixed here

While testing, the terminal's disk list contained a disk with ID -1. I didn't look into the cause.

🤖 Generated with Claude Code

https://claude.ai/code/session_018MRyTdV3fSV5Q5NPGep4q9

[coveralls]

Coverage Report for CI Build 39131310929

Coverage decreased (-0.6%) to 46.751%

Details

• Coverage decreased (-0.6%) from the base build.
• Patch coverage: No coverable lines changed in this PR.
• 312 coverage regressions across 2 files.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

312 previously-covered lines in 2 files lost coverage.

File	Lines Losing Coverage	Coverage
org/cyclops/integratedscripting/client/gui/component/input/WidgetTextArea.java	207	0.0%
org/cyclops/integratedscripting/client/gui/container/ContainerScreenTerminalScripting.java	105	0.0%

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Coverage Stats

Relevant Lines:	2662
Covered Lines:	1364
Line Coverage:	51.24%
Relevant Branches:	908
Covered Branches:	305
Branch Coverage:	33.59%
Branches in Coverage %:	Yes
Coverage Strength:	23.24 hits per line

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💛 - Coveralls