fix: correct Show in Source navigation (#line offset + unquoted filenames)

[theodevelop]

Type of change

• Bug fix
• New feature
• Refactor / internal improvement
• Docs / config only

What does this PR do?

• Fixed showInSource jumping to the wrong line when the cursor is below a #line directive — now applies the correct offset sourceLine + (cursorLine − directiveLine)
• Fixed #line detection not matching unquoted filenames (#line 28 parser.y without quotes)
• Extracted pure helpers to client/src/lineDirectiveUtils.ts for testability (no VS Code mock needed)

Closes

Closes #29 #27 (comment by @GitMensch)

Changes

• client/src/lineDirectiveUtils.ts — new module: isGeneratedFile, LineDirective, findNearestLineDirective
• client/src/lineDirectiveNavigation.ts — imports from utils, applies offset formula
• tests/test-line-directive.ts — 26 assertions (quoted, unquoted, edge cases)

How to test manually

• TS_NODE_PROJECT=tsconfig.base.json npx ts-node tests/test-line-directive.ts → 26 passed, 0 failed
• npm run compile → no errors
• Manual: cursor N lines below #line M → navigates to line M + N in source
• Manual: unquoted #line N filename.y → directive detected and navigation works
• Manual: cursor above all #line directives → warning message shown

Checklist

• npm run compile passes with no new errors
• Tests added or updated (npx ts-node ...)
• Manual test done in VS Code
• CHANGELOG.md updated
• No unintended files staged (node_modules, .env, dist...)

[GitMensch]

Is that correct? I think yes, but the later use of the offset should possibly have another + 1:

goes to

note that #line 6287 "../../cobc/parser.y" says that the next line is line 6287;

cursor line (6290) - directive line (6287) = 3 (+1 --> 4 if considered from the #line itself), but the position is only 3 lines below the #line .

Apart from that the feature works fine.