e4362bbfad
The tab keys (1-9 jump directly, T cycles next) were always wired in main.rs but not documented anywhere visible. Operators could not discover how to switch between the 9 data tabs (Per-CPU / System / Info / Motherboard / Battery / Sensors / Network / Storage / Process) without reading the source. Two surfaces now surface the tab keys as the FIRST entries, ahead of governor / P-state / throttle controls: 1. Controls panel (visible at the bottom of every TUI frame): adds a 'Tabs:' line listing the 9 direct-jump keys with abbreviated tab names, plus a [T] cycle line. Implemented in render_controls(). 2. --help output (HELP_TEXT constant, shown via 'redbear-power --help' and the in-TUI [?] help overlay): adds a TABS: section at the top of the INTERACTIVE CONTROLS block, listing all 9 tabs in 3-row grid + the [T] cycle key. The keys themselves are unchanged: '1'-'9' for direct tab jump, 'T' for cycle. No new keybindings or behaviors added. Discovered during interactive smoke-testing on the Linux host: the binary worked perfectly but tab navigation was a discoverability hole. Fix-only, no semantic change. 186/186 tests still pass (the controls panel render is covered by the existing snapshot tests).