Make the confirmation dialog tests reach the cases they name

[amrali-eg]

Summary

• Test-only. ItBuildsWhenNothingIsRefused used a Shift_JIS file, which the policy refuses, and asserted the absence of prose the dialog no longer uses, so it passed with the refusal panel showing.
• ItBuildsForAMixOfEveryOutcome only checked that the form had some controls, and its fixtures did not cover every current outcome.

Changes

• ItBuildsWithoutASourceChoicePanelWhenNothingNeedsOne: an automatically convertible file; asserts the plan (one Convert, no source choice) and that lstRefusedFiles, lstSourceEncoding and btnConfirmSourceEncoding are absent, by control name rather than by prose.
• TheSummaryShowsEveryOutcomeWithItsCount: 15 files with a different count in each of the five categories (1 ready, 2 need a source, 3 already in target, 4 not identified, 5 cannot be processed safely). Checks the plan summary, the count the dialog shows beside each label, and that only the two Shift_JIS files are offered a source choice. This also gives the source-choice controls a positive control.

Verification

• Full suite 917/917, 0 warnings.
• Mutation-tested, each caught by the intended test: refusal panel always built; already-in-target and not-identified counts swapped; "Cannot be processed safely" showing the source-choice count; safe fixture swapped for a refused one. Distinct counts are what let the swap mutations fail.

Limits

• Reads the constructed form, not a live window; no GUI smoke run.
• The "cannot be processed safely" fixture is a double-BOM file, because the corrupt-file case only lands in that category once Plan a file that fails full validation as a refusal #126 merges.

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