[CoffeePoweredComputers]

Replaces the one-text-box-per-parameter probe input with a call line, and fixes the validation gap that made list[str] accept integers.

Why

The per-parameter boxes were 72px wide, so lists and strings scrolled out of view, and three or more arguments wrapped into an unreadable line. The maintainer chose the call-line design from an interactive comparison of four options. While prototyping it we found that a list[str] parameter accepted integers with no error, on both the frontend and the backend.

What changes

Call line (ProbePanel.vue, useProbeState.ts, new probeArgs.ts and pythonLiteral.ts)

• The function name and parentheses are fixed text; the student edits one inline, wrapping argument list between them, as Python literals, positional or keyword: mystery([3, 1, 2]), greet("Ann", times=2).
• Tab on an empty line or a button fills in name= placeholders. Enter probes. Shift+Enter does nothing. Tab on a filled line leaves the editable. Paste is plain text.
• role=textbox, aria-label, aria-placeholder, aria-invalid, aria-describedby to the error list and a help line; disabled state is announced; focus ring survives forced-colors mode.
• Parsing: top-level comma split honouring nesting and quotes; keyword/positional mapping with line errors for unknown, duplicate, too many positional, positional-after-keyword and empty arguments; a Python-literal reader for True/False/None, quotes and escapes, tuples, sets, trailing commas. Unicode parameter names work.
• Mapped values go through the existing per-parameter parser, so the error list (li#probe-err-<name>) and every other selector and behaviour (badge, hint, history, duplicate detection, exhausted state) are unchanged. The request body is unchanged.

Container item validation, matching rules on both sides

• Backend validate_probe_input: list/tuple/set[T] and dict[K, V] with primitive item types are checked item by item (bool is not int, int accepted for float); bare forms by shape; nested and Any items unchecked as before. Messages: Parameter 'items' must be a list of str, a dict of str to int; hidden signatures keep the generic text. dict keys are checked only for str, since JSON keys always arrive as strings.
• Backend parse_function_signature now splits on top-level commas, so dict[str, int] is one parameter (parse_function_signature splits on commas naively; breaks probing for container/tuple/default signatures (3 duplicate parsers) #160 on the probe path; both probeable handlers delegate to it). The instructor authoring parser still has the naive split and is not touched here.
• Frontend mirrors the same rules; an untyped value that starts with a bracket or quote and fails to parse is now an error instead of silently becoming a string.

E2E: all probe specs moved to the call line via a shared helper; a seeded tag(items: list[str], prefix: str) problem reproduces the bug in the UI (A12) and at the API (A16); new tests for keyword/positional mapping and each line error, the Tab template, quoted str arguments, Shift+Enter and Tab leaving, the closing parenthesis trailing a wrapped line, and phone width.

Verification

• pytest -m unit, probe integration tests, Vitest (597), ESLint, stylelint, i18n:check: all green.
• Probeable e2e suite, 5 specs, twice with two workers: green. 16/16 in the probing spec on a separate run.
• Three Fable review rounds; the one blocker found (a single-quoted str argument was sent with its quotes) is fixed with unit and e2e coverage.

Known limits

• tuple[int, str] is validated by shape only.
• ProbePanel.vue is over the ESLint max-lines warning threshold, as it already was on master.
• vue-tsc still crashes locally; CI runs it with continue-on-error.

🤖 Generated with Claude Code

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 92.80742% with 62 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...components/activities/inputs/shared/ProbePanel.vue	87.76%	23 Missing ⚠️
...mponents/activities/inputs/shared/pythonLiteral.ts	94.03%	13 Missing ⚠️
...omponents/activities/inputs/ProbeableCodeInput.vue	0.00%	8 Missing ⚠️
...omponents/activities/inputs/ProbeableSpecInput.vue	0.00%	8 Missing ⚠️
purplex/problems_app/services/probe_service.py	95.74%	6 Missing ⚠️
...c/components/activities/inputs/shared/probeArgs.ts	99.23%	2 Missing ⚠️
...mponents/activities/inputs/shared/useProbeState.ts	94.28%	2 Missing ⚠️

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