fix(dark mode): make text-muted theme-aware via the secondary token

[talissoncosta]

Changes

Contributes to #6606.

.text-muted is a static #656d7b with no dark variant, so muted text is 3.45:1 on the dark surface (fails WCAG AA). Point $text-muted at the --color-text-secondary token so the utility becomes theme-aware: #656d7b in light (unchanged, 5.22:1) and #9da4ae in dark (7.16:1).

One line, no usage churn. Unlike text-secondary, .text-muted doesn't collide with the token utilities, so its ~170 usages don't need migrating; fixing the value is enough. Full removal of Bootstrap's .text-muted can come with the later cleanup.

How did you test this code?

Compiled the stylesheet: .text-muted now emits color: var(--color-text-secondary) !important. Light mode unchanged; recommend a dark-mode eyeball on muted text (tables, forms, labels).

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Docker builds report

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• frontend/web/styles/_variables.scss

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[github-actions]

Playwright Test Results (oss - depot-ubuntu-latest-16)

 5 passed

Details

 5 tests across 3 suites
 38 seconds
 3a5f5e5
 🔄 Run: #18162 (attempt 1)

Playwright Test Results (oss - depot-ubuntu-latest-arm-16)

 3 passed

Details

 3 tests across 3 suites
 12 seconds
 3a5f5e5
 🔄 Run: #18162 (attempt 1)

Playwright Test Results (private-cloud - depot-ubuntu-latest-16)

 5 passed

Details

 5 tests across 4 suites
 19.8 seconds
 3a5f5e5
 🔄 Run: #18162 (attempt 1)

Playwright Test Results (private-cloud - depot-ubuntu-latest-arm-16)

 1 passed

Details

 1 test across 1 suite
 19.8 seconds
 3a5f5e5
 🔄 Run: #18162 (attempt 1)

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[talissoncosta]

Consolidated into #7982 so the whole dark-mode colour change can be QA'd in one pass. Same commit is included there.