Fix ESLint errors across all JavaScript files

[Copilot]

The three browser JS files in the project contained ESLint violations: implicit globals, missing semicolons, loose equality (==), unused variables, and debug console.log calls. This adds ESLint tooling and resolves all warnings.

Tooling

• eslint.config.mjs – Flat config with sourceType: "script" (required for /* exported */ directive support), browser globals ($, htmx, bootstrap, DOM APIs), and rules: no-unused-vars, no-undef, semi, eqeqeq, no-console
• package.json – Added lint:js script and eslint dev dependency

htmx_dialog.js

• Removed dead code: defaultWidgetOptions object and getConfig function (never called)
• == → === throughout; added missing semicolons; normalised indentation

obfuscatre_htmlfield.js

• Removed unused event parameter from the submit handler
• Removed debug console.log calls
• Fixed Python-style "True" → "true" in JS attribute value

autocomplete.js

• Added /* exported */ comment for all functions used via inline HTML event handlers (e.g. onkeydown, onfocus) — these are globally accessible but invisible to the linter
• Promoted implicit globals to explicit var declarations:

  // Before (implicit global, flagged by no-undef)
  phac_aspc_autocomplete_blur_skip = {};
  // After
  var phac_aspc_autocomplete_blur_skip = {};

• Fixed !=/== → !==/===; added missing semicolons on arrow-function assignments

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[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.00% (target: -1.00%)	✅ ∅

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (a6d72e4)	4847	3053	62.99%
Head commit (9c3710c)	4847 (+0)	3053 (+0)	62.99% (+0.00%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#24)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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