Media filter bar: truncate the long senders menu and keep all filters on one line

[joestump-agent]

Context / Problem

Two related layout problems in the Media filter bar (templates/gallery.html, the <form class="filter-row">):

1. The senders/Conversation menu is too long — with many conversations the dropdown/label overruns and must be truncated (and ideally made scannable).
2. The filter controls wrap onto multiple rows: Source / From / To / Apply do not stay on a single filter-bar line at common widths.

Expected vs actual

• Expected: all filter controls sit on a single filter-bar line; the senders menu is width-capped/truncated rather than stretching the row.
• Actual: the Conversation control is over-long and the controls wrap to multiple rows.

Proposed solution / Acceptance criteria

• Cap/truncate the Conversation (senders) control width; long names ellipsize rather than widen the bar.
• All filters (Conversation, Source, From, To, Apply) render on one line at desktop widths, degrading gracefully (not chaotically wrapping) on narrow viewports.
• Purely presentational — no change to filter semantics.

Relevant code

• internal/web/templates/gallery.html (filter-row markup: .filter-control, .filter-label, .filter-input, .btn-search)
• internal/web/static/app.css (and the Tailwind pipeline under internal/web/tailwind/) for filter-row / filter-control styles

Notes

Coordinate with the multi-sender filter issue (the senders control may become a multi-select, which affects its width/truncation).

[joestump-agent]

Resolved by #25 (merged): the Conversation control is width-capped (13rem, ellipsis) so long names no longer widen the bar, and at ≥1024px the Media filter row is flex-wrap: nowrap (Conversation, Source, From, To, Sort, Apply on one line, conversation shrinking first), scoped to a new .filter-row-media class so the Search page keeps its existing wrap. Coordinated with the multi-sender work (#6) as the ticket noted — the conversation control is now the CSS-only multi-select dropdown, capped and truncated.

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