Fix MATLAB E-I shard: companion toolbar tests for Phase 1040 bell

[HanSur94]

Problem

PR #180 (Phase 1040: Companion Notification Center) landed on main and turned the MATLAB Tests (E-I) shard red — on main itself and on every PR that merges with it. (Sibling to #181, which fixes #180's Octave breakage.)

Confirmed it's a main regression, not PR-specific:

• main @ c02e34d6 (just before Phase 1040: Companion Notification Center — acknowledgeable inbox in the Event Viewer #180): E-I shard green.
• main @ 2a191c0b (Phase 1040: Companion Notification Center — acknowledgeable inbox in the Event Viewer #180 merge): E-I shard red — Tests failed: 2.

Root cause

#180 added the notification bell to the FastSenseCompanion toolbar, growing it from a 1×9 to a 1×10 grid (documented in FastSenseCompanion.m):

col … 7 = Wiki (70)
col   8 = Bell (70)      ← inserted by Phase 1040
col   9 = flex spacer '1x'   (was col 8)
col  10 = gear (36)          (was col 9 — "shifted 9 -> 10 to make room for the bell")

#180 updated TestFastSenseCompanion and TestCompanionEventViewer, but missed TestFastSenseCompanionPlantLogToolbar:

• findToolbarGrid_ matched only a 9-column grid → grid never found → verifyNotEmpty failed in testToolbarGridIs1x5.
• testSettingsButtonMovedToCol5 asserted the gear at col 9 → now col 10 → verifyEqual failed.

The implementation is intentional and self-consistent; only the test drifted.

Change

Test-only. Updates tests/suite/TestFastSenseCompanionPlantLogToolbar.m to the shipped 1×10 layout {110,110,110,130,70,90,70,70,'1x',36}:

• findToolbarGrid_: 9→10 columns, match cw{8}==70 (bell) and cw{10}==36 (gear).
• testToolbarGridIs1x5: assert cw{8}=70 (bell), cw{9}='1x' (spacer), cw{10}=36 (gear) + refreshed column map.
• testSettingsButtonMovedToCol5: gear now at col 10.

Plant Log button assertions (col 4) are unaffected — the bell sits at col 8, after Plant Log.

Verification

• MATLAB R2020b+ (live session via MCP): 11/11 pass — the two previously-failing methods now green; companions built and torn down cleanly.
• Code Analyzer / mlint: clean.
• This test passed on headless-Linux CI before Phase 1040: Companion Notification Center — acknowledgeable inbox in the Event Viewer #180, so the uifigure path works headless; this change only updates expected column count/values, so it will pass headless too.

🤖 Generated with Claude Code

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Codecov Report

✅ All modified and coverable lines are covered by tests.

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[HanSur94]

Superseded by #181, which now carries both this toolbar fix and the Octave-compat fix in one PR. Splitting them left each PR with the other half of #180's breakage still red (neither independently green), so consolidating into #181 for a clean, mergeable unblock-main PR. The toolbar commit (eca5251) was cherry-picked onto #181 unchanged.