Fix syntax highlighting and editor performance in the scripting terminal

[rubensworks]

Phase 5 of the scripting terminal UX improvements, stacked on #80 (then #79, #78, #77). One commit per item.

Improve syntax highlighting in the script editor

Problem: Highlighting matched keywords as substrings. In a dev client:

• var in variable, let in outlet and inside the string "let it be", and return in returnValue and inside a block comment were all highlighted as keywords.
• The . in 1.5 was highlighted as a symbol.
• Strings and comments weren't highlighted at all, even though a COMMENT style existed.
• Highlighting ran per wrapped display line, so nothing could span lines.

Change:

• The editor tokenizes the full script once: word boundaries, strings with escapes, template literals, numbers, line comments and block comments, plus a fuller keyword list. true, false, null and undefined use the existing CONSTANT style.
• ILanguageHandler gets a default markupScript(String) built on markupLine, so other handlers keep working.
• The editor slices the full-text markup per visual line.
• 11 unit tests, and before/after screenshots checked.

Only re-wrap and re-highlight the editor text when it changes

Problem: The whole script was wrapped and highlighted again on every key press, including cursor movement, scrolling and selection changes.

Change: The text layout is cached until the text changes, and styled text is only built for visible lines.

Measured in the dev client with lines of about 95 characters (each wraps to about 3 rows):

Script	Arrow key before	Arrow key after	Typing a character after
100 lines	2.4 ms	0.5 ms
500 lines	9.0 ms	0.4 ms
2000 lines	41 ms	0.3 ms	25 ms

The arrow key "before" column includes the tokenizer from the first commit. On master, a full rebuild was 6.8 / 15.9 / 40 ms.

Dropped from the original plan

A monospace font: 4-space indentation is clearly readable in the normal font, so it would change the look without fixing a demonstrated problem.

Testing

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

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Generated by Claude Code

[github-actions]

Coverage Report for CI Build 39109367309

Coverage increased (+0.6%) to 43.978%

Details

• Coverage increased (+0.6%) from the base build.
• Patch coverage: No coverable lines changed in this PR.
• 439 coverage regressions across 4 files.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

439 previously-covered lines in 4 files lost coverage.

File	Lines Losing Coverage	Coverage
org/cyclops/integratedscripting/client/gui/component/input/WidgetTextArea.java	283	0.0%
org/cyclops/integratedscripting/client/gui/container/ContainerScreenTerminalScripting.java	142	0.0%
org/cyclops/integratedscripting/api/language/ILanguageHandler.java	7	0.0%
org/cyclops/integratedscripting/core/language/LanguageHandlerJavaScript.java	7	87.12%

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Coverage Stats

Relevant Lines:	3388
Covered Lines:	1621
Line Coverage:	47.85%
Relevant Branches:	1419
Covered Branches:	493
Branch Coverage:	34.74%
Branches in Coverage %:	Yes
Coverage Strength:	23.26 hits per line

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