chore: init Backlog.md task tracking (capture v1.1 polish task)

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+
+<!-- BACKLOG.MD GUIDELINES START -->
+<CRITICAL_INSTRUCTION>
+
+## Backlog.md Workflow
+
+This project uses Backlog.md for task and project management.
+
+**For every user request in this project, run `backlog instructions overview` before answering or taking action.**
+
+Use the overview to decide whether to search, read, create, or update Backlog tasks.
+
+Use the detailed guides when needed:
+- `backlog instructions task-creation` for creating or splitting tasks
+- `backlog instructions task-execution` for planning and implementation workflow
+- `backlog instructions task-finalization` for completion and handoff
+
+Use `backlog <command> --help` before running unfamiliar commands. Help shows options, fields, and examples.
+
+Do not edit Backlog task, draft, document, decision, or milestone markdown files directly. Use the `backlog` CLI so metadata, relationships, and history stay consistent.
+
+</CRITICAL_INSTRUCTION>
+<!-- BACKLOG.MD GUIDELINES END -->

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+project_name: "glint"
+default_status: "🟦 Backlog"
+statuses: ["🟦 Backlog", "🟢 In progress", "🚧 Paused", "🏁 Done"]
+labels: []
+date_format: yyyy-mm-dd
+max_column_width: 20
+default_editor: "micro"
+auto_open_browser: true
+default_port: 6420
+remote_operations: true
+auto_commit: false
+filesystem_only: false
+zero_padded_ids: 3
+bypass_git_hooks: false
+check_active_branches: true
+active_branch_days: 30
+task_prefix: "TASK"

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+---
+id: TASK-001
+title: v1.1 optional theme polish (from final review)
+status: "\U0001F7E6 Backlog"
+assignee: []
+created_date: '2026-06-28 17:27'
+labels:
+  - polish
+dependencies: []
+priority: low
+ordinal: 1000
+---
+
+## Description
+
+<!-- SECTION:DESCRIPTION:BEGIN -->
+Non-blocking Minors from the v1.1 whole-branch review. M1 (plan-mandated): scanFrontmatter/scanLine muted spans use th.Blockquote but tests assert th.Muted — equal in all 3 shipped themes today, fragile if a future theme diverges them. M2: cycleTheme stores preview style but doesn't re-Render an already-open preview pane until toggle. M3: picker textinput prompt/text not themed (bubbles default). M4: selected-row highlight covers label but not the '▸ ' pointer.
+<!-- SECTION:DESCRIPTION:END -->
+
+## Acceptance Criteria
+<!-- AC:BEGIN -->
+- [ ] #1 muted frontmatter spans painted with intended semantic color
+- [ ] #2 open preview pane recolors on Ctrl+T
+- [ ] #3 picker textinput uses theme colors
+<!-- AC:END -->