fix(qt): make governance search case-insensitive

[thepastaclaw]

PR description

Summary

• Make the Governance proposals title filter case-insensitive.
• Match the behavior already used by other Qt search/filter views.

Closes #7287.

Validation

• git diff --check
• Pre-PR review gate: ship
• Not run: full build / GUI smoke test; no build directory was available in
  this worktree.

[thepastaclaw]

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✅ No Merge Conflicts Detected

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: d43df620-5f99-4d47-afc2-f5951962b64b

📥 Commits

Reviewing files that changed from the base of the PR and between 7e524b1 and c318e57.

📒 Files selected for processing (1)

• src/qt/proposallist.cpp

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Walkthrough

The proposal list filtering in src/qt/proposallist.cpp is modified to perform case-insensitive matching when filtering against the title column. The QSortFilterProxyModel is configured with a case-insensitive filter, while the filter string binding and proxy model setup remain unchanged.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: making governance search case-insensitive in the Qt UI.
Description check	✅ Passed	The description clearly relates to the changeset, explaining the case-insensitive filter implementation and referencing the closed issue.
Linked Issues check	✅ Passed	The code change implements case-insensitive filtering for governance proposals, directly addressing issue #7287's requirement for case-insensitive substring search.
Out of Scope Changes check	✅ Passed	The single line change to proposallist.cpp only modifies the case sensitivity behavior of the governance proposals filter, which is directly within scope of issue #7287.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

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🧪 Generate unit tests (beta)

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[thepastaclaw]

✅ Review complete (commit c318e57)

[thepastaclaw]

Code Review

Single-line Qt fix making the governance proposal title filter case-insensitive via setFilterCaseSensitivity(Qt::CaseInsensitive). Both reviewers independently found no issues; the change matches the established pattern used elsewhere in the Qt code (transactionview.cpp, masternodelist.cpp, addressbookpage.cpp).

Reviewed commit: c318e57