Refactor Analysis (AI / Deep Analysis) tab

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The Analysis tab (info.js `loadAI` + `pollAIStatus` + `renderAIProgress` + `renderAIAnalysis` + the trading pipeline section + competitor scoring + key-people polling) has grown into a tangled web of:

• Two overlapping state machines (Phase 1 `intelligence` poll vs Phase 2 `trading` poll), each with its own polling function, stop-handle, and re-render path
• innerHTML swaps at the container level that have repeatedly clobbered the Deep Analysis header / button (see the fix that introduced `#ai-content-host`)
• Pieces of vim-nav state (`tradingPanelIdx`) reset at the top of `loadAI` for a single ergonomics fix
• Trading button wiring split across `renderTradingButton` (HTML), `wireTradingButton` (handler), and the in-flight running state baked into the same render path

Symptoms over time:

• Run Deep Analysis button vanishing when Phase 1 auto-kicks off on a fresh security (fixed by introducing an `#ai-content-host` div, but the fix is a workaround for the root architectural issue)
• Polling intervals leaking when the user tab-switches mid-flight (handled via `currentTab` checks scattered through every poll callback)
• Re-render races between Phase 1 completion and Phase 2 kick-off

Suggested refactor:

• One state object: `{ phase1, phase2, costInfo }` with explicit transitions
• Pure render functions taking that state → HTML, no mid-poll innerHTML mutations
• Single poller that knows about both Phase 1 and Phase 2 and routes by which is in flight
• Move the Deep Analysis header into a stable shell that the polled content slots into

Not a regression — just a "the next time someone touches this tab, redesign instead of patching" reminder.