fix(hwgen): prevent prefix collisions when resolving source names

[norulers]

The _lookup_input_idx, switchLookupIdx, and adcGetInputIdx functions used strncmp for prefix-only matching, causing SL (switch) to match SL1 (slider) before switch lookup. Fix by requiring exact length match via strlen check to prevent prefix collisions between analog input names and switch names.

Closes: mixer source changing from SL to S3 after power cycle on T22

[coderabbitai]

📝 Walkthrough

Walkthrough

Three name-lookup functions (_lookup_input_idx, adcGetInputIdx, switchLookupIdx) now require an exact string-length match against the candidate name before applying strncmp, preventing false matches when the candidate name is longer than the provided prefix length.

Changes

Exact-length lookup checks

Layer / File(s)	Summary
Analog input lookup radio/src/analogs.cpp	_lookup_input_idx stores the candidate name locally, checks strlen(input_name) == len, then applies strncmp.
ADC input lookup radio/src/hal/adc_driver.cpp	adcGetInputIdx stores the ADC input name locally and adds a strlen(input_name) == len check before strncmp.
Switch lookup radio/src/switches.cpp	switchLookupIdx adds a strlen(sw_name) == len check before strncmp.

Estimated code review effort: 1 (Trivial) | ~5 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title is concise and accurately summarizes the main bug fix in lookup matching.
Description check	✅ Passed	The description clearly summarizes the fix and impact, though it doesn't follow the template headings exactly.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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