Cover install helper branches with focused tests

[kitsuyui]

Summary

Cover install helper branches with focused tests

Extract the pure InfoPlist.strings conversion and exec-script generation
helpers from install-app-forked-lite.ts into a dedicated module, then add
focused Vitest coverage for Firefox, Chromium tabbed, and Chromium app-mode
script generation plus strings2Obj and obj2Strings behavior. This keeps
the forked installer flow and runtime behavior unchanged while making the
branch-heavy install responsibility directly observable from the existing test
suite.

Chosen fix

• approach: extract-and-test-install-script-pure-helpers
  The highest-risk gap in this finding is pure branch-heavy logic that lives
  inside a process- and filesystem-heavy installer entrypoint. Extracting only
  those deterministic helpers is the smallest safe implementation because it
  improves coverage representativeness without introducing new harnesses,
  changing repository settings, weakening quality gates, or altering supported
  runtime versions. Side-effect-heavy installation steps remain untouched, but
  the Firefox/Chromium decision logic and InfoPlist.strings transforms now
  have direct regression checks.

[github-actions]

gh-counter

PR gate

	Removed	Added	+/-
TODO/FIXME	0	0	0
Type escape	0	0	0
Lint suppression	1	1	0
Electron webPreferences risk	0	0	0

Repo dashboard

	main (a03e5b6)	#89 (bbc13ad)	+/-
TODO/FIXME	0	0	0
Type escape	1	1	0
Lint suppression	36	36	0
Electron webPreferences risk	0	0	0

Lint suppression patch breakdown

File	Removed	Added	+/-
main-src/libs/app-management/install-app-async/install-app-forked-lite-helpers.ts	0	1	+1
main-src/libs/app-management/install-app-async/install-app-forked-lite.ts	1	0	-1

Lint suppression repository breakdown

File	main (a03e5b6)	#89 (bbc13ad)	+/-
main-src/libs/app-management/install-app-async/install-app-forked-lite-helpers.ts	0	1	+1
main-src/libs/app-management/install-app-async/install-app-forked-lite.ts	1	0	-1

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Reported by gh-counter

[github-actions]

Code Metrics Report

	main (a03e5b6)	#89 (bbc13ad)	+/-
Coverage	41.1%	42.9%	+1.7%
Code to Test Ratio	1:0.3	1:0.3	+0.0
Test Execution Time	7s	7s	0s

Details

  |                     | main (a03e5b6) | #89 (bbc13ad) |  +/-  |
  |---------------------|----------------|---------------|-------|
+ | Coverage            |          41.1% |         42.9% | +1.7% |
  |   Files             |            146 |           147 |    +1 |
  |   Lines             |           2578 |          2582 |    +4 |
+ |   Covered           |           1061 |          1109 |   +48 |
+ | Code to Test Ratio  |          1:0.3 |         1:0.3 |  +0.0 |
  |   Code              |          13389 |         13518 |  +129 |
+ |   Test              |           4299 |          4383 |   +84 |
  | Test Execution Time |             7s |            7s |    0s |

Code coverage of files in pull request scope (0.0% → 24.0%)

Files	Coverage	+/-	Status
main-src/libs/app-management/install-app-async/install-app-forked-lite-helpers.ts	94.1%	+94.1%	added
main-src/libs/app-management/install-app-async/install-app-forked-lite.ts	0.0%	0.0%	modified

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Reported by octocov