Walkthroughs: stop autoplaying muted, and show the length

Marty asked why they start muted. Browsers only permit autoplay when a video
is muted, so "expand and play" necessarily meant "expand and play silently" —
and for these that is the wrong trade, because the narration IS the training.
A member's first visit was showing them a silent walkthrough.

So the panel now opens paused with the play button showing. Pressing it is a
user gesture, which means it plays with sound, every time. preload stays
'none' until the panel opens, then goes to 'metadata' so an open panel shows
a real first frame instead of a black rectangle.

Each bar now also carries its runtime ("· 71 sec"), so nobody has to guess
whether they are committing to one minute or ten.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

public/suite-grants.html

@@ -64,6 +64,6 @@
   <p class="g-note"><strong style="color:var(--text)">Grants come out of a separate monthly pool that your level gives you</strong> — giving to your team never eats into your own allowances, because nobody should have to choose between equipping their people and using their own tools. Pools reset on the 1st along with everything else, so a grant is for unblocking somebody now rather than building a balance. <br><br>Independent team resource · No income is guaranteed · Cryptocurrency involves risk.</p>
 </main>
 <script src="/suite-grants.js"></script>
-<script src="/tool-video.js" data-video="/tv/suite-team-grants.mp4" data-title="Watch the Team Grants walkthrough" data-key="grants" defer></script>
+<script src="/tool-video.js" data-video="/tv/suite-team-grants.mp4" data-secs="· 58 sec" data-title="Watch the Team Grants walkthrough" data-key="grants" defer></script>
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