[Repo Assist] test: add coverage for ensure_selection_visible branches and csv_escape

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What

Adds 6 targeted tests to src/app.rs that complete branch coverage for two existing functions:

ensure_selection_visible (3 new tests)

Previously only the scroll-down path was tested. This PR adds:

Test	Branch covered
ensure_selection_visible_scrolls_viewport_up	selected < offset → scroll up
ensure_selection_visible_already_visible_is_noop	selection in-view → offset unchanged
(existing) ensure_selection_visible_scrolls_viewport_down	selected ≥ offset + viewport → scroll down

csv_escape (4 new tests)

The csv_escape helper is a pure function called in the export path but had no direct unit tests:

Test	Case
csv_escape_plain_string_is_unchanged	no special chars → pass-through
csv_escape_string_with_comma_is_quoted	comma → wrap in "..."
csv_escape_embedded_quote_is_doubled	" → "" inside wrapping quotes
csv_escape_newline_triggers_quoting	\n → wrap in "..."

Test Status

cargo test       → 236 passed (was 230)
cargo clippy     → clean
cargo fmt --check → clean

No production code changed.

Note

🔒 Integrity filter blocked 1 item

The following item were blocked because they don't meet the GitHub integrity level.

• After scrolling, current position is unvisble #151 list_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".

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    min-integrity: approved  # merged | approved | unapproved | none

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