docs: add rcon password display design spec

docs/superpowers/specs/2026-05-13-rcon-password-display-design.md

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+# RCON Password Display on Server Detail Page — Design
+
+**Goal:** Show the RCON password on the server detail page with a show/hide toggle.
+
+**Architecture:** Presentational change only. The `server.rcon_password` field already exists in the database and is rendered via Jinja2 autoescaping into the template. A small external JS file provides the reveal/hide interaction via delegated click on `[data-password-toggle]` attributes — no inline handlers.
+
+**Files touched:**
+- `l4d2web/static/js/password-reveal.js` — new, ~15 lines
+- `l4d2web/templates/server_detail.html` — add one row to `.server-info` DL
+- `l4d2web/templates/base.html` — add script include
+- `l4d2web/static/css/components.css` — optional, add `.password-mask` letter-spacing if default renders poorly
+
+---
+
+## Template
+
+Add after the blueprint row in `server_detail.html` (line 13):
+
+```html
+<div>
+  <dt>RCON Password</dt>
+  <dd>
+    <span class="password-mask" data-password-field="{{ server.id }}">••••••••••••</span>
+    <span class="password-value" data-password-field="{{ server.id }}" hidden>{{ server.rcon_password }}</span>
+    <button class="link-button" data-password-toggle="{{ server.id }}" aria-label="Show RCON password">show</button>
+  </dd>
+</div>
+```
+
+## JavaScript (`password-reveal.js`)
+
+Delegated click listener on `[data-password-toggle]`. Toggles `hidden` between the mask span and value span, updates button text and aria-label.
+
+```js
+document.addEventListener('click', (e) => {
+  const btn = e.target.closest('[data-password-toggle]');
+  if (!btn) return;
+  const id = btn.dataset.passwordToggle;
+  const mask = document.querySelector(`[data-password-field="${id}"].password-mask`);
+  const value = document.querySelector(`[data-password-field="${id}"].password-value`);
+  const hidden = value.hidden;
+  value.hidden = !hidden;
+  mask.hidden = hidden;
+  btn.textContent = hidden ? 'hide' : 'show';
+  btn.setAttribute('aria-label', hidden ? 'Hide RCON password' : 'Show RCON password');
+});
+```
+
+## CSS
+
+Reuse existing `.link-button` for the toggle button. If the bullet characters render inconsistently across browsers (spacing, baseline), add a simple `.password-mask { letter-spacing: 0.15em; }` class — but likely unnecessary.
+
+## Security
+
+- Password is server-rendered via Jinja2 autoescaping — no XSS vector.
+- Visible in page source to the server owner (consistent with existing auth model: user must own the server).
+- No copy-to-clipboard functionality (per requirements).
+
+## Testing
+
+No new tests required — purely presentational change. Existing `test_create_server_generates_rcon_password` in `test_servers.py` already covers password generation.