fix(security): remove orphaned pages router file

[nasalehj]

Summary

Closes #816

Removes the unused Pages Router security page so the repository has one canonical transaction-security implementation under the App Router. The live implementation remains src/components/security/TransactionSecuritySettings.tsx, which is consumed by the dashboard.

Why

The deleted file was an orphaned Pages Router route with no imports or links, while the application routes through src/app/. Keeping both similarly named implementations increased maintenance and tooling ambiguity without providing user-facing behavior.

What was built

File	What it contains
src/pages/security/TransactionSecurity.tsx	Deleted the unused 425-line Pages Router implementation.

The active App Router component and its consumers were left unchanged. Repository search confirms that no source reference points to pages/security.

Integration changes outside src/pages/

• None. No files outside the orphaned Pages Router path were modified.

Acceptance criteria coverage

• src/pages/ no longer exists. (test ! -e src/pages/security/TransactionSecurity.tsx and the directory is absent after deletion.)
• npm run typecheck and npm test pass. These commands were run, but the upstream baseline fails independently of this deletion: typecheck/build stop on pre-existing syntax errors in unrelated files, and the full Jest run reports 77 failed suites, 63 passed suites, 159 failed tests, and 986 passed tests.
• git grep \"pages/security\" returns nothing. (git grep -n -E 'src/pages/security|pages/security|TransactionSecurity' returns no pages/security match.)

Deliberately deferred

• None.

Test plan

• git diff --check — passes for the issue-specific diff.
• git grep -n -E 'src/pages/security|pages/security|TransactionSecurity' -- ':!package-lock.json' — no pages/security references.
• npm run typecheck — blocked by pre-existing unrelated syntax errors in the upstream baseline.
• npm test -- --runInBand — blocked by pre-existing repository test failures: 63/140 suites passing and 986/1145 tests passing.
• npm run build — blocked by the same pre-existing typecheck errors.
• npm run lint — blocked because the checked-out dependencies do not include eslint-plugin-jsdoc.

Env vars / Notes

No environment variables, configuration values, migrations, or public APIs were added or changed.

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